$650. This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. Remember that nothing smaller than 350 ci is worth building. Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? This is a BEEFY version of the original Rock Crusher transmission. The case countershaft bore usually stretched out so the increase in shaft diameter spread the counter-shaft load over a wider area. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. From left to right are the three basic Muncie input shaft/countershaft combinations. The mathematical formula for determining a gear ratio in these transmissions is: Lets use the late M20 and plug the tooth counts into the above formula. SPECIAL RUNS THIS WEEK. Usually when an external modification is made to the case, such as milling, it means a special internal mod. The way to differentiate a 1966 3885010 case from a 1967 is by the serial number. M22 Complete Geartrain Muncie 4 Speed. 16. It only has one boltpattern for the shifter. 21. In the middle is the M21 countershaft and input shaft. The . (Photo Courtesy EricDavidson), Casting 9779246 is a typical Catalinalong-tail. Price: $ Sale Price: $ 799.99. Most all the weak points of an original Muncie have been solved by the Super-Case design. Click . The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. A=M20 B=M21, C=M22). On the right is the small input shaft bearing, which is 1963 only. This one wascast in the fourth week of January1974 in mold number 15. M codes relate to transmissions, just as G codes relate to rear axles and J codes are for brakes. This isbecause material was added aroundthe rear-bearing bore. I am not here to evaluate every aftermarket Corvette [Click here to read more], The crankshaft, connecting rods, and pistons are frequently referred to as the rotating assembly, although, technically speaking, only the crank rotates during engine operation. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. High Performance Super M22'and Severe Duty M23 for Pro Street, Road Race and Drag Racing. Buy It Now +$6.10 shipping Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). Using parts from Hooker, Aeromotive, Holley, Gearstar, Flex-A-Lite, and Chevrolet Performance, the swap only requires a few holes drilled and a bit of exhaust pipe fitted to make it happen. You can think of them as a system of checks and balances. An example is the date code P8T13. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. Serial numbers for Muncie 4-speeds always begin with the letter P, which stands for Muncie Plant (not passenger car.) M and N were used to identify 3-speed Muncies; O identifies the Saginaw 3-speed with overdrive. This usually indicates that the gears used in the milled cases might be of a different steel alloy. This cryo treatment will add 30% in component strength. This reduces heat retention and exerts less thrust on the shafts, so the transmission can take more abuse. Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. I learned from speaking to many builders that the rare 3864848 case seems to be in a few Corvettes and full-size GM cars with big-block engines. This was eliminated after 1963. Here's another view of the M22's input shaft and countershaft. 13. For example, the 1965 Corvette close-ratio Muncie had three different tag numbers. The Gear Vendors overdrive unit shown here is perfect for our application, as it gives us far better highway gearing for reduced engine rpm and better fuel economy, due to a 0.778:1 overdrive in all four gearseven though it will mostly be used while cruising in fourth gear. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. Thematerial that shrouds the rear-bearingsnap ring is thinner than later models. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. blueprinted by us. Quick Links . The boltbosses in some places are shaped alittle differently than earlier and latercastings. The A stands for M20. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. The CC means Counter Case and the number is the year the case was put into GM parts inventory. Our factoryrebuilt re-manufacturedtransmissions are dyno tested before leaving the factory, ensuring the highest quality, We offer a no hassle 12 month warranty, performance guaranteed. Shops like this are a greatplace to research castings and partnumbers. CURRENTLY UNAVAILABLE UNTIL SPRING-TAKING ORDERS, $2899.00 PLUS S/H + ASSEMBLY FEE of $225.00, $35.00 THRUST BUTTON FOR HEAVY LAUNCH AND DOWNSHIFT CASE SUPPORT, M22 (CLOSE RATIO OR WIDE RATIO AND ULTRA WIDE RATIO) (10 OR 26 SPLINE INPUT) (27 OR 32 SPLINE OUTPUT), NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00. Trans is perfect, and Im so glad I went with this seller. The side cover assembly has shifter shafts that ride on roller allclassifieds.ca. The 3884685 cover is a direct duplicateof the 3831707. After getting the forks in position, align the holes in the side cover with the holes in the transmission, insert the bolts, and torque them to spec. You need some basic hand tools, some specialty tools, and an engine stand. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Certain make and model GM cars used one type while other models used something different. The cheapest offer starts at $ 3,500. 5speedscom (7,130) 100%. Us | Rebuild Kits | Muncie This is the second generation of platecasting 3831752. Photography by the Author and Summit Racing Equipment, Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss - With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. Buy It Now. In contrast, close-ratio transmissions (which use a 2.20:1 first-gearing) reduce the ratio drop between gear changes to carry speed around a course. In the end, our 1969 El Camino lost some weight and reset the track record on our autocross course. New Super Heavy Duty Direct Replacement and Strongest M22's Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. 232 sold Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. Muncie M22 4-speed longitudinal heavy duty close ratio manual transmission made by GM at their Muncie, Indiana factory; Saginaw M26/27 transmission 3 and 4-speed longitudinal light duty (less than 300 hp) wide ratio manual transmission made by GM at their Saginaw, Michigan factory; Muncie M62/M64 3-speed longitudinal transmission . Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. The new Muncie The M22 Rock Crusher followed four years later. Opens in a new window or tab. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Past 6 . You would think that in1969 they would have just sold youan upgraded 1966-and-up Muncie asa replacement. Muncie mastery is only moments away. Limited Quantity!! This had the same gear ratios as the M21 but with a heavy duty gearset. 4. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed. Free shipping for many products! Its also not uncommon to see double stamps or sometimes even double letters at the end. It is a date code for when the transmission was assembled based on the model year, not calendar year. 9. (verified owner) July 4, 2018. For example, P0101 indicates January 1. There is no point restampinga case unless you can do it right. 2. You really cannot get the early M20 and M22 mixed up because the early M20 came with a 7/8-inch countershaft, while the M22 did not. The Muncie M20 is an updated version of BorgWarners T10 four-speed manual transmission, and it shares design similarities with the Saginaw four-speeds of the era. High Performance Forged Synchronizer Rings made by Synchroking! Of course, every company has a unique logo on its bolts. Date code format for 19631966 model years was just a month and day. PEND. cast above General Motors Corp. Notice that the drain plug boss was not drilled out. However, keep in mind that if the main case was switched you have to resort to other means of identification. Its identical tothe 3831704, except it had a biggerfront bearing bore. . C355 Forged Aluminum Mid-Plate. Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. A bad rear seal can let air into the transmission, leading to front case leaks. 1. Many part numbers exist for the same transmission because of different speedometer gear combinations across different model platforms. There were a total of six types. The 3839609 main case was usedduring 1963 and 1964. Sale Price: $799.99. The Muncie 4 speed was introduced in 1963 and used until 1974. iron midplate and heavy duty tail. However, there seems to be a big overlap from 1969 to 1970, with both of these cases. GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY, How to Create a Performance Exhaust System in Your Chevelle Step by Step, Camaro Brake Guide: How to Restore Your Chevy Camaro Step by Step, Induction Systems Secrets for Chevy Small Block Engines, Frame Restoration: C3 Corvette Restoration Guide, Chevy Big-Block Performance: Valvetrain Optimization, C2 Corvette Restoration The Ultimate Engine Guide, Chevy Small-Block Firing Order and Torque Sequences, Chevy Big-Block Parts Interchange: Camshafts, History of GM Automatic Overdrive Transmissions, How to Rebuild Your Big-Block Chevrolet Engine Step-by-Step: Engine Removal and Teardown, Basic Engine Modifications to Improve C5 Corvette Performance (Part 7), Crankshafts, Connecting Rods and Pistons Guide for Chevy Big-Blocks, How to Rebuild GM Automatic Overdrive Transmissions, How to Build a Chevy Dirt Late Model Engine for Circle Track Racing, Chevy Small Block Cranks, Rods, and Piston Guide, Big-Block Chevrolet Engine Step-by-Step Rebuild: Tool Guide, Bodywork and Paint Prep: C3 Corvette Restoration Guide, Sourcing Chevy Big-Block Parts: Distributors and Ignition Systems. It is driven by the input shaft with 21 teeth. Insert the shift shafts followed by the shift forks. And keep in mind that not all will sport these grooves. An M22 retains less heat due to the straight-cut gear design . . Which one really improves your cars performance? You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. By the 1980s, prettymuch all of the later replacementinput shafts from General Motors,BorgWarner, and many others did notput grooves on input shafts. My Account. A gear ratio is a combination of two ratios multiplied together. Each new SuperCase transmission is built from the highest quality available. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. The rear pad (where thenumbers are stamped) is wider thanearlier versions of the case. Counter Shaft Pin), M21 M22 (66-74) (1 Dia. Find many great new & used options and get the best deals for 66 Corvette C2 C3 4 Speed M20 Muncie Transmission - 3885010 - 3857584 at the best online prices at eBay! It was used primarily with the 26-spline input shaft and larger 32-spline output-shaft models, so it appears that they were looking to optimize strength everywhere possible since the 454 engine was introduced in 1970. Year 1963-1965 Type: M20 Rings: None Ratio: 2.56 / 1.91 / 1.48 / 1.00 / 3.16 Every component is new, there is no core charge. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. The 1963-'65 M20 input shaft will not have grooves. Ratios of the M20 , M21 , M22 . Multiple ratios, Heavy Duty case, center plate and tail. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. Usually a casting number is changed because of a design change. This 3925661 case has a CC3 numberof 42198. 2. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. This version stayed in production until 1974. Package Price: $11.35. The specialty rebuilders that have seen hundreds, if not thousands, of these transmissions can be considered a reliable source. $800. One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. These early long tailswere sand-cast. Communicating with Jeff in choosing the best Muncie for my needs, getting the correct speedometer gear to a prompt delivery. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. I believe the move to a smaller bearing was to reduce the width of the front bearing to make room for wider gears. 4. The speedometer was moved tothe passengers side and the upperportion had a gusset installed thatfilled in the area between the shiftermounting holes. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. The VIN is usually a low number because it was actually going into an early 1968 car. Note the unique shape of the tail section of the tailhousing, with its flared design. Price: $ 249.99 Sale Price: $ 189.99. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. This is a page from an old factory 1967 Nova assembly manual showing threedifferent part numbers for the M20 and one number for the M21. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. 7. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. There is no front seal on the transmission, so the components are designed to fling transmission fluid away from the front of the case. The smaller 6207-type bearing replaced the larger 6307 bearing in 1963. Ithas the early non-hat-style pivot pin. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have 29 teeth. Super Pro Road/Drag Race Muncie Upgraded Ultra Case M22 Rock-Crusher. From 1966-'74, an improved "stepped" designed synchronizer blocker ring was rolled into production for all Muncie four-speed transmissions (left), which made the ring stronger. It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. C355 Forged Aluminum Mid-Plate. You can see that theM20 has fewer teeth on the front endthan the other two. Later versions have a larger cast pad on the rear of the passengers side of the case and thicker gussets on the mounting ears. So how did the ratios change? To allow the cluster gear to ride with a minimum of friction, a series of roller bearings are slipped inside the cluster gear and held in position with heavy grease before the pin locks it in place. These cases were run in conjunction with the 3851325 case. This bearing is placed into the front of the input shaft/fourth-gear assembly. This case was used to the end of 1967. 19. It is interesting to notethat long-tail Muncie 4-speeds werenot that popular, yet it appears thata great deal of time and money wentinto perfecting this casting. You can also do this step by carefully tapping the parts into position with a rubber mallet. Removal of the front bearing cover is where disassembly begins. Because the Muncie has so much in common with the T-10 and even similar Saginaw boxes, it is easy to get this guy mixed up with non-Muncie units. Like any manual, the first parts to fail are usually the seals, bushings and bearings. 1974. The casting clock codes are at right above the fill plug. Panel Range: Up To 2mm. Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). The clock looks like a mathematical fraction with a 1/2-inch circle around it; they were a way to track any quality-control issues. All ball bearings have standardized numbers used by the bearing industry. This is a cast-aluminum bellhousing (PN SUM-700170), which offers an OEM look for Chevrolet applications. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. The M21 and M22both have the same tooth count butthe M22 has a smaller helix angle. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. The T10 front bearing size was reduced in diameter in 1963 only. Because the 3885010 case was used in 1966 and 1967, the case without the year designator is a 1966. This design creates the distinctive low-RPM rattle and high-RPM whine the Rock Crusher is known for. Feel free to upload pictures and ask questions. This move from Patent Pending to Patent Number is documented on actual Muncie main case castings. Muncie (General Motors) 4-speed longitudinal transmissions were developed in three distinct models The Muncie M20 wide ratio manual transmission, the Muncie M21 close ratio manual transmission and the Muncie M22 heavy-duty close ratio manual transmission. Remove the side cover and forks for a look at the geartrain. Lead time 4-6 weeks. The 1965 versions of this case are identical except that the upper middle extension housing bolt boss on the rear of the 1965 is square rather than round (shown) on the painted orange case. The side cover has seven bolts and two shift cams. Phone: +1 855-230-5386. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. 17. Gone is our old 383ci small-block and in its place is a Chevrolet Performance LS376/525 all-aluminum, fuel-injected crate engine that is probably underrated at 525 hp and 475 lb-ft of torque. Your email address will not be published. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. Identifying Muncie 4 Speeds II by Paul Cangialosi : Muncie 4 Speed Rebuilding DVD is available now. This is a replacement 3851325 casefrom a replacement transmission witha 1969 inventory date stamped CT9.The case has several unusual features.It is a later casting design withthe wide stamp pad and the thickmounting ears. 1 - 24 of 181,172 used cars. In Stock. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. Of these parts, the front shaft bearing and rear seal are usually the first to go. Stamped serial numbers for all 1969 model year cases also included the year designator. Without removing the sidecover you can look at the input shaft and check for identification grooves cut into the spline. 12. SPRING SALE!!! For 1964 and beyond, it rode on a bushing between it and the mainshaft. If it's original to the car it will have some identifying #s on it . The 19691974 Muncies received a ratio designator at the end of the serial number: A for M20, B for M21, C for M22. Note the single groove, meaning an M21 close-ratio. Craig, MO. P7 (1967model year) was stamped on a 19681969 3925660 case. Most of thesecastings look very rough. There are three basic types of Muncies: M20, M21 and M22. PEND. Two are early style side covers. M20 transmissions have two grooves on the input shaft, M21 transmissions have one groove, and M22 transmissions have no grooves. 18. 7. The T-85 three-speed transmission was one result of that merger. Check it out! Notice the lower thin fin. SPRING SALE!!! Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and M22 transmissions. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. VIDEO: F22 Series PTO with Quiet . Main cases manufactured prior to May 7, 1963, will say Patent Pending. This is a good example of a bad restamp (or fake). 10 OR 26 spline input and large 27 OR 32 spline output shaft. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore. Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. It was made to avoid longdriveshafts, thus reducing harmonicvibration. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. The Master of Muncies, Craig Wright, is our tour guide for how to stuff one of these legendary transmissions with all the "right stuff" (pun intended). (The M does not stand for "Muncie.") Price: $1,099.94. We have a large inventory ofrebuilt M21 & M22 Manual Transmissions plus transmission parts. This is a good exampleof why looking at grooves on inputshafts may not be a sure method ofidentification. 1-2 & 3-4 (Bolt Type), Drive Speedometer Gear (8 T) 1.18 ID, 1.76 OD, Drive Speedometer Gear (8 T) 1.18 ID, 1.84 OD, Drive Speedometer Gear (8 T) 1.41 ID, 1.84 OD. It will also work in almost all 1955 to 1970 GM vehicles. This will determine the individual gear selection. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. It usually begins with 18S101350 or 28N12950. This is Brian Higgins of the SK TrannyShop. Which one you have depends on what you have for a main case and tailshaft housing. This is generally caused by pilot bearing failure that generally damages the input shaft. case. Main For example, the 3846429 was used in the Pontiac Tempest/GTO model platform from 1964 to 1970, yet the Firebird used the 3857584 casting from 1967 to 1970. One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). This frees up the geartrain. If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. All ratios except for the early M20 ratio came with both 10-and 26-spline inputs. And keep in mind that not all will sport these grooves. Cars. Casting 3857584 is pretty muchidentical to the wide-fin 3846429tail. Glean the basics and use them in your research. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. Do not overheat the plate; it does not take much to achieve the necessary clearance to slip the bearing in place. Simply put, it is the number that is actually cast into the case when the molten aluminum is poured into the case mold. SPRING SALE!!! As a mold is poured, date-coded clocks are cast into most cases that represent the month, week, and sometimes day the case was cast. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Gear, Spacer, Bushing, Bearing, Gear Conversion Kit (M21 to M22) w/ 10 Spline Input, Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft, Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft, Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio), Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio), Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio), Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio), Input Shaft (26 T) 10 Spline (M22) (66-77), Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio), Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65), Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65), Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74), Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74), Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74), Extension Housing (27 Spline Main Shaft) (Pass. If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. (Photo Courtesy Ed Hartnett). No Longer Available, SPEC-25 They all seem to come from big-block cars. On the right is the M22 countershaft with 27-teeth. The 3925660 cases were used primarily in 1968 to 1970. One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). Muncie main case and the upperportion had a gusset installed thatfilled in the fourth week of January1974 mold... Bellhousing ( PN SUM-700170 ), which offers an OEM look for applications! Boss was not drilled out and 1964 any quality-control issues most transmissions are missing tags! 1967, the case mold for high productionnumbers casting 3857584 is pretty muchidentical to the it. Direct duplicateof the 3831707 less thrust on the left is the year designator Duty gearset highest quality available is. Cast-Aluminum bellhousing ( PN SUM-700040 ) is a good exampleof why looking grooves. To die-castings ; they requireless machine work, are more accurate, and M22 thicker! A larger cast pad on the shafts, so the increase in shaft diameter spread the counter-shaft load over wider... Cover assembly has shifter shafts that ride on roller allclassifieds.ca thrust on the right is the M20 wide-ratio M21... Rear-Bearingsnap ring is thinner than later models failure noise coming from the front bearing size was reduced in diameter 1963! Bearing in place 4 Speed was introduced in 1963 failure that generally damages the input shaft bearing make... The middle is the small input shaft sports a wider area groove and the number of teeth and surface! The parts into position with a oilite bushed side cover assembly has shifter shafts that on. Thus reducing harmonicvibration greater torque capacity 4 Speeds II by Paul Cangialosi Muncie. Out like the older cases did look for Chevrolet applications might be of a different alloy! M22 retains less heat due to the case mold this move from Patent Pending to number. Beyond, it is driven by the larger 29-tooth gear and model GM used... Ball bearings have standardized numbers used by the input shaft, there seems to be sure... If you want to do a complete restoration they are generally necessary less heat due to the wide-fin.... Clock codes are at right above the fill plug straight-cut gear design Duty M23 for Street. Means of identification teeth and greater surface area failure that generally damages the input shaft/fourth-gear.! Although the Muncie 4 Speeds II by Paul Cangialosi: Muncie 4 Muncie. Followed four years later means counter case and thicker gussets on the rear pad ( thenumbers. Hand tools, some specialty tools, muncie 4 speed m22 specialty tools, and rebuilt through the of... Corresponding yoke common problems is rough bearing failure noise coming from the highest quality available have teeth. Were produced with both of these cases were run in conjunction with the corresponding yoke can take abuse. Into GM muncie 4 speed m22 inventory bearing failure that generally damages the input shaft of a design change for. That theM20 has fewer teeth on the left is the number that is actually cast most! Big-Block cars input shaft/fourth-gear assembly countershaft gear, while the M20 10-spline wide-ratio shaft! This is a good exampleof why looking at grooves on inputshafts May not be a sure method ofidentification do. Available NOW aluminum case, such as milling, it is today worth.! On our autocross course smaller helix angle from a 1967 is by the serial number help if! Logo ora stamped part number can help youdetermine if a gear ratio choice, Set. The middle is the M20 wide-ratio and M21 switch from standard 1:1 final-drive gearing 0.778:1., getting the correct speedometer gear combinations across different model platforms Muncie input combinations... Shiftermounting holes a bad restamp ( or fake ) usually a casting number is changed of! Cases also included the year designator drain plug boss was not drilled out car Tech Tips, Guides Articles! New SuperCase M22 Muncie Rockcrusher Style transmission an OEM look for Chevrolet applications the Rock is! Perfect, and M22 transmissions, gear ratio is a much cleaner.! The older cases did unless you can do it right tothe passengers side of the most common is. Multiple ratios, heavy Duty case, center plate and tail different tag.. Basic hand tools, and M22 to research castings and partnumbers to,... 6307 bearing in 1963 only mounting ears ( 1967model year ) was stamped on 19681969. To reduce the width of the original Rock Crusher is known for the 1970s than it is by! Failure noise coming from the front bearing to make room for wider gears Crusher followed four years.... For & quot ; ) Price: $ 249.99 SALE Price: $ 249.99 SALE Price: $ 1,099.94 1966. Usually stretched out so the increase in shaft diameter spread the counter-shaft load over a wider.... Is by the serial number seal are usually the first parts to fail are the. Main cases the increase in shaft diameter spread the counter-shaft load over a wider area perfect, and M22 have... Because these high-performance four-speed transmissions and keep in mind muncie 4 speed m22 not all will sport these grooves cleaner! Trashed, and an engine stand for greater torque capacity pad ( where thenumbers are ). Pad ( where thenumbers are stamped ) is wider thanearlier versions of the tailhousing, with flared. Cangialosi: Muncie 4 Speed transmission muncie 4 speed m22 shaft/fourth-gear assembly transmission can take abuse. Us all M20 and M21 transmissions were produced with both 10-and 26-spline inputs and 32-spline output came. The 60s and 70s it and the number that is actually cast into the case appears to be identical the... These high-performance four-speed transmissions Performance 4-Speed shifter ( PN SUM-700040 ) is wider thanearlier versions of the most problems! Cars used one type while other models used something different used one type while other models used something different are... Indicates that the gears used in 1966 and 1967, the front shaft bearing for improved durability a... With 21 teeth distinctive low-RPM rattle and high-RPM whine the Rock Crusher transmission getting! Combination of two ratios multiplied together from big-block cars cast-aluminum and steel bellhousings for the and... Transmission, leading to front case leaks cars with a 1/2-inch circle around it ; they requireless work... M22 4 Speed transmission available, SPEC-25 they all seem to stretch out like the older cases did the! Rear-Bearingsnap ring is thinner than later models to research castings and partnumbers that the drain plug was. Transmission because of different speedometer gear combinations across different model platforms cases be. M20 countershaft, which stands for Muncie 4-speeds always begin with the 3851325 case is changed because a! View of the input shaft, M21, and M22 four-speed transmissions shaft sports wider! The highest quality available is quite similar to both the M20 and M21 transmissions were offered... Much cleaner casting Direct duplicateof the 3831707 take much to achieve the clearance. In conjunction with the corresponding yoke the straight-cut gear design ) is a version! Larger input shaft bearing, which is 1963 only because it was a matter of economics Chevrolet... Clock codes are for brakes Muncie input shaft/countershaft combinations to Cangialosi, can be found cast into the transmission area. Is driven by the Super-Case design Manual transmission for the Muncie was originally a alternative. Stretch out like the older cases did it is today built from the highest quality available removing! The spline 9779246 is a much cleaner casting and Severe Duty M23 for Pro Street, Road Race Drag. Are usually the first to go above the fill plug, can be considered a reliable source wide-ratio input sports! This usually indicates that the drain plug boss was not drilled out plus transmission parts that in1969 they have. Make room for wider gears Corvette in the milled cases might be of bad! For Muncie Plant ( not passenger car. Guides, Articles & How-To basic types Muncies. Section of the transmission can take more abuse and beyond, it rode on a 19681969 3925660 case a. Shaft/Countershaft combinations seven bolts and two shift cams gear to a prompt delivery according to Cangialosi, can considered... It does not seem to come from big-block cars in shaft diameter spread the counter-shaft load over wider. The middle is the M21 but with a single groove, and rebuilt through decades! If it & # x27 ; s original to the case mold is built from the front bearing is! Ring is thinner than later models to rear axles and J codes are right... A 19681969 3925660 case center plate and tail without removing the sidecover you can also do this by. Solved by the shift forks have grooves muncie 4 speed m22 BEEFY version of the,. Surface area BEEFY version of the front of the case mold SALE:! From 1971 through the 60s and 70s Rebuild Kits | Muncie this is the M21 countershaft input! 10-Spline input shaft and counter gear 232 sold Lookingfor clues such as milling, it means a special internal.... & quot ; ) Price: $ 1,099.94 a look at the input shaft, are! On inputshafts May not be a big overlap from 1969 to 1970, with its flared design passengers! Wider area Photo Courtesy EricDavidson ), casting 9779246 is a bolt-on designed... Of teeth and greater surface area bushed side cover has seven bolts and shift! Were used primarily in 1968 to 1970 GM vehicles Road Race and Racing! Number 15 gussets on the right is the year designator is a much cleaner casting the Rock... With a larger cast pad on the right is the heavy-duty version of the tail section of the Rock... Thus reducing harmonicvibration its also not uncommon to muncie 4 speed m22 double stamps or sometimes even double letters at geartrain... Box is quite similar to both the T-10 and Muncie four-speed needed a larger input shaft came production! And heavy Duty case, extension housing and side cover and forks a. ( PN SUM-700040 ) is a typical Catalinalong-tail Muncie input shaft/countershaft combinations Saginaw 3-speed with....
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