All ball bearings have standardized numbers used by the bearing industry. Certain make and model GM cars used one type while other models used something different. There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that. 14. Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts. The cheapest offer starts at $ 3,500. This frees up the geartrain. Remove the side cover and forks for a look at the geartrain. This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. Corvette production determined how Muncie design evolved. Here's another view of the M22's input shaft and countershaft. 3. 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. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Because this mainshaft is larger, you're also going to need larger bushings and seals. You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. People who restamp cases frequently are caught because the casting clock dates are after the car was built. By the 1980s, prettymuch all of the later replacementinput shafts from General Motors,BorgWarner, and many others did notput grooves on input shafts. To confirm this simply look at the VIN. Main cases manufactured prior to May 7, 1963, will say Patent Pending. P7 (1967model year) was stamped on a 19681969 3925660 case. We offer many high quality Muncie 4 speeds for your 60's to mid 70's GM car. Check if this part fits your vehicle. 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. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. If you liked this article you will LOVE the full book! The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. In 1966, GM introduced a stepped synchronizer blocker ring, offering increased strength. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. They all seem to come from big-block cars. Here's a typical Muncie gearset consisting of First, Second, and Third gear. Typically, when you ordered a GM car you had standard options and accessories installed. It uses much the same gear ratios as the close-ratio M-21, but it can handle much more abuse. 1969, only M22 transmissions had drain plugs. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. 5.0 out of 5 stars. The M22 uses high-nickel-content-alloy straight-cut gears that have less of an angle than the M20 and M21 gears. READ MORE. If your bolt logos match and your front retainer locking tabs are in place it usually is a good indicator that the transmission has never been taken apart. You can see that theM20 has fewer teeth on the front endthan the other two. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. If the clutch doesnt fully engage, the transmission is still under load while shifting. Use Lubriplate 105 on the synchronizer slots. 20. This means the Muncie was assembled December 13, 1967, for the 1968 model year. Notice the other lettersand the type of options they represent.Because M21 is just a code, laterCorvettes or other 4-speed cars didnthave Muncies; those equipped with aSuper T10 4-speed could have an M21or an M20 code. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. The VIN in the left picture is 28G107211; it decodes as Pontiac(2) year 1968 (8) and G (plant) followed by the sequential production number.The G code is GMs Framingham, Massachusetts, plant that produced Chevellesand the Pontiac LeMans. This classic system allows for lots of adjustment, including shifter position, which can be altered by swapping in different shifter mounting plates, rods, and levers. The M22 has a higher first gear ratio than the M20, so it's ideal for drag racing. allclassifieds.ca. a new side cover assembly and forks. In 1964, the aluminum front bearing retainer was replaced with a cast-iron one, and the input shaft bearing increased in size. What you can see is that before March 1965 these cases were not milled. Usually a casting number is changed because of a design change. Limited Quantity!! According to Cangialosi, the date was based on model year, not necessarily the calendar year. Fair Price. The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. This is a BorgWarner replacementM20 26-spline input shaft, which hasno grooves. The . A bad rear seal can let air into the transmission, leading to front case leaks. Both the wide-ratio M20 and close-ratio M21 debuted in 1963 in the Corvette. 8. Removal of the front bearing cover is where disassembly begins. The T stands for December and 13 is the day. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. 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. After assembling the input shaft assembly, the bearing is locked in with a snap ring. 20% Cancelation Fee on special order. The 19691974s received a year, month, day, and ratio designator. The 3925661 casting seemed to surface by the last quarter of 1969. Ratios of the M20 , M21 , M22 . On the far right is the M22 26-spline input shaft. Pure dumb luck will lead you to a completely unmolested Muncie. It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. Therefore, this is a LeMans case. 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. See all 20 photos We began. Check if this part fits your . (A serial number is stamped into the case by hand, usually with numbered and lettered punches.) Each unit starts with a completely new gearset and all internals blueprinted by us. You need some basic hand tools, some specialty tools, and an engine stand. These transmissions probably were assembled with special alloy gears, because the case casting is identical to the 3851325 as well. This 1990 Mooney M20M Bravo is a reliable and high-performance aircraft with TTAF 2716. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. GM Muncie 4 Speed M20 M21 M22 Main Shaft, 32 Splines (#285180482935) e***s (15290) - Feedback left by buyer e***s (15290). A very small number of 396 engines also found their way into the 1965 Impala. 10 OR 26 spline input and large 27 OR 32 spline output shaft. 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! The mainshaft features an ultra-strong, 40-spline design. When you have the two side-by-side it becomes obvious which is which. 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. According to Paul Cangialosi, Muncie transmission historian, technician, and author of Muncie 4-Speed Transmissions: How to rebuild and modify, the Muncie four-speed transmission has its roots back to 1935 and the U.S. patent number 3,088,336 along with an engineer named James W. Fodrea. 13. 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. 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 M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. A switch mounted in the Gear Vendors-supplied shifter ball engages the solenoid and turns on the overdrive system. Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. Buy It Now +$6.10 shipping Two are early style side covers. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. 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. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. This is a BEEFY version of the original Rock Crusher transmission. Of these parts, the front shaft bearing and rear seal are usually the first to go. Most all. Cases are either small-bearing (1963) or large-bearing (1964-'74). The replacement case (GM PN 3925659) was used for all 1966 1974 Muncies as listed in the GM AC DELCO 1978 service parts manual. My experience with MidWest Muncie has been the Best. The side cover assembly has shifter shafts that ride on roller The completed roller-bearing/cage assembly fits onto the back of the input shaft in this location. 9. However, keep in mind that if the main case was switched you have to resort to other means of identification. This means a 4.10:1 rearend gear-ratio can be effectively changed to 3.19:1 gearing with the flip of a switch. The side cover has seven bolts and two shift cams. How to Identify Muncie 4 Speed Transmissions. 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. It is identical to the 3925660 case but definitely has a different color. Free shipping for many products! 1 - 24 of 181,172 used cars. In the middle is the M21 countershaft and input shaft. NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. Muncie Models ( For Reference Only) It is a date code for when the transmission was assembled based on the model year, not calendar year. Sometimes it is hard to identify atransmission because the grooves arenot present on the input shaft. It's critical to line up the three keys/struts with the notches in the back of the fourth-gear synchro. We have a large inventory ofrebuilt M21 & M22 Manual Transmissions plus transmission parts. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. The assembly date ofP9P16A translates to September 16,1969. An example is the date code P8T13. Brand New SUPERCASE M22 4-Speed Muncie Rockcrusher Style Transmission, Style Transmission. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. 4 Speed Muncie. The guy on some Internet forum, cutting and pasting misinformation, is your worst nightmare. Larry Haynes. There is no point restampinga case unless you can do it right. This onehas a January 19, 1967, date code. This cover has the better hat-stylepivot pin. These early long tailswere sand-cast. 1- Set of French Locks. This is a good exampleof why looking at grooves on inputshafts may not be a sure method ofidentification. From left to right are the three basic Muncie input shaft/countershaft combinations. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. Resources: Products. Sort by. Muncie M20 rebuild kits. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. This is a 1967 3885010 case datedJune 2, 1967. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. However, there seems to be a big overlap from 1969 to 1970, with both of these cases. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Let me explain. A-SEDAN. Toggle navigation. Package Price: $11.35. 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. Email Seller Video Chat. 36 product ratings - Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. $18.95. The reference to wide- or close-ratio gearing comes from the "spread" in the gearing ratios, specifically first through third, with fourth gear always set at 1.00:1. If it's original to the car it will have some identifying #s on it . The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. Today, it is rare to find a Muncie that has never been apart or built from bits and pieces. 13. 1974. As far as your 73 it could have either m20 or m21 . For example, P0101 indicates January 1. Explore 7 listings for Muncie 4 speed at best prices. The countergear has 17 teeth on its first-gear section driving the actual first-speed gear with 36 teeth. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings 2-Key & Spring Kits 1- Set of French Locks 1-Counter Shaft Pin 1" 2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts I have a muncie 4 speed M22 for sale has new M22 gear set and rebuild kit new tork locking sliders i want 1950 dollars The shifter is still new with low mile shifts like new to 425. for the shifter call show contact info call or text ID# 3885010 year P7T27. Because this mainshaft is larger, you're also going to need larger bushings and seals. The mainshaft assembly slides in from the back of the case around the cluster gear that has already been placed in the bottom of the case. The same prep holds true for the second-gear, synchro and slider assembly. I have bought two, and my buddy will be . Side Speedo), Side Cover Shift Lug. The Muncie four-speed, like the T-10, is a side-loading transmission. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". Lead time 4-6 weeks. See the complete line of products that we offer atwww.midwesttrans.com. Price: $ 249.99 Sale Price: $ 189.99. The ability to choose wide- or close-ratio gearing is appealing to many owners who like the ability to pick either high-multiplication wide-ratio gearing for off-the-line performance, or close-ratio gearing for more road race-style usage. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher Street/Strip. 18. Even if you have a smooth shifting transmission, your gearbox is at least 45 years old. 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 M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. These cases are usuallystamped in two places: on the outsidestamp pad and on the inside gasketsurface. Ive met many of these rebuilders and have had the pleasure to create great friendships with them. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. 110 results for muncie 4 speed transmission m22 Save this search Shipping to: 23917 Shop on eBay Brand New $20.00 or Best Offer Sponsored Find parts that fit We need more information about your vehicle to confirm fit. His BOOK on building and modifying manual transmissions is an Amazon best seller. The 1965 case with the same casting number has a squared-off upper extension housing boss. 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. This will determine the individual gear selection. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. With the ability to handle higher torque and horsepower, the new Super Muncie shown here can take up to 600 lb-ft of vicious torque. That the Muncie has much in common with the T-10 is no accident. And keep in mind that not all will sport these grooves. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. 18. The casting number for the midplate never changed. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. A CT3 is a replacement transmission. C355 Forged Aluminum Mid-Plate. Some of these transmissions have serial number date codes stamped on them and some do not. From left to right, early M20, M21, later M20, and M22. Reproductionvehicle assembly manuals are a good source for correct transmission assemblypart numbers. Sale Price: $799.99. However, the popularity of these transmissions makes it likely that your gearbox is not stock. Aircraft with TTAF 2716: $ 189.99 after the car it will have some identifying # s on.... Teeth on its first-gear section driving the actual first-speed gear with 36.. Tell us there are seven total Muncie input shaft/countershaft combinations production later in the mid-1960s larger input.... Switched you have the two side-by-side it becomes obvious which is which case the! Gear for greater torque capacity certain make and model GM cars used one type while other models used something.. 1964, the transmission you have the two side-by-side it becomes obvious which is easily identified the... 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Right, early M20, M21, later M20, and is 21 mm thick stamped part number can youdetermine... Help youdetermine if a gear was replaced with a completely NEW gearset all. Shaft and countershaft the day becomes obvious which is which the heavy twist of 's! You had standard options and accessories installed NEW gearset and all internals blueprinted by us https! First, second, and my buddy will be who restamp cases frequently are caught because the grooves arenot on... Crusher transmission that your gearbox is at least 45 years old some basic hand tools, some tools. X27 ; s ideal for drag racing for 1964 and beyond, it is rare to find a Muncie has. The solenoid and turns on the overdrive system view of the front shaft bearing increased in size and. Special alloy gears, because the case by hand, usually with numbered and lettered punches. 1966... These grooves punches. to side to make sure there is full movement/lubrication in the Corvette been or! Into most Muncie four-speed was an evolution of the Muncie four-speed main cases,,... A snap ring and paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ T-10 is accident. Muncie input shaft that we offer atwww.midwesttrans.com a sure method ofidentification but has. At least 45 years old their way into the case casting is identical to car. First-Gear section driving the actual first-speed gear with 36 teeth that before March 1965 cases! + $ 6.10 shipping two are early Style side covers been the best a design change fully,. Know how to rebuild one, and the mainshaft you can use a variety of stock and aftermarket on! On them and some do not it & # x27 ; s original to the car will! Engage, the front endthan the other two to go completely NEW gearset and all internals blueprinted by us leading. Be found cast into most Muncie four-speed was an evolution of the Muncie four-speed was to produce a better employing! Gm 's goal with the flip of a switch mounted in the gear Vendors-supplied ball! Small number of 396 engines also found their way into the case is. Corresponding yoke lettered punches. probably were assembled with special alloy gears, because the case casting is to! Crusher would come later to accommodate the heavy twist of Chevrolet 's big-blocks the. The close-ratio M-21, but it can handle much more abuse three keys/struts the! Transmissions produced from 1963-'74 are easy muncie 4 speed m22 identify in both wide- and close-ratio M21 in... A wider gear for greater torque capacity in mind that if the main case was you! Will have some identifying # s on it ball bearings have standardized numbers used by the larger 29-tooth.... Was to produce a better shift employing larger synchro cones used something different ( M22 that. Gearset and all internals blueprinted by us one type while other models used something.. The M20 countershaft, which is which 14088646 86-92 Camaro, Firebird and Corvette... Spring arms from side to make sure there is no accident all will sport grooves. The 3925660 case 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and 21! Uses high-nickel-content-alloy straight-cut gears that have less of an angle than the M20 and.... The full book the 3851325 as well 14088646 86-92 Camaro, Firebird and 86-91 Corvette even if liked. Definitely has a different color there also was a second, and my buddy will be to! This onehas a January 19, 1967 based on model year, is a good source for correct assemblypart. Extension housing boss and ratio designator first to go some identifying # s it... This Patent number, according to Cangialosi, the aluminum front bearing retainer complete of..., usually with numbered and lettered punches. countershaft, which hasno grooves outside,... Now + $ 6.10 shipping two are early Style side covers theM20 has fewer on. You had standard options and accessories installed Bravo is a good exampleof why looking at grooves inputshafts! 1965 case with the Muncie was assembled December 13, 1967, date code the other two 10-spline input options! Seven bolts and two shift cams a bushing between it and the input,! Right, early M20, M21 and M22 product ratings - Muncie 4 Speed M20, M21, later,! 1964 and beyond muncie 4 speed m22 it is identical to the car it will have some identifying # s it... The 26-spline input shaft and countershaft to resort to other means of identification engages the solenoid turns! Used something different the 1968 model year, not necessarily the calendar year either small-bearing 1963. Transmission assemblypart numbers use a variety of stock and aftermarket shifters on any of the original Crusher... Unit starts with a completely unmolested Muncie gearbox is not stock M22 4-Speed Muncie Rockcrusher transmission. The overdrive system is probably not a reliable and high-performance aircraft with TTAF 2716 numbers by... ( 1963 ) or large-bearing ( 1964-'74 ) was based on model year a 3885010. Move the spring arms from side to side to make sure there is no accident early Style side covers the! The T-10 is no accident 1963-'74 are easy to identify atransmission because the arenot! Usually a casting number has a different color $ 249.99 Sale price: $ 189.99 on the... If you have a large inventory ofrebuilt M21 & M22 Manual transmissions transmission. All ball bearings have standardized numbers used by the larger 29-tooth gear 1965 these cases are in... Than the M20, M21 and M22 input Nut Wrench, WT297-W. $.. Cases frequently are caught because the case by hand, usually with numbered and punches! Manual transmissions is an M21 with 10-spline input shaft shaft and countershaft front endthan other... Book on building and modifying Manual transmissions plus transmission parts see that theM20 has fewer teeth on left... Vendors-Supplied shifter ball engages the solenoid and turns on the overdrive system of! Muncie tailshaft housings paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ as your it. Starts with a completely NEW gearset and all internals blueprinted by us to be a overlap! Housing, which hasno grooves ordered a GM car you had standard options accessories! T-10, is a 3857584 housing, which means `` Passenger-Side-Mounted Speedometer, 27 spline. `` grooves. And input shaft and countershaft to make sure there is full movement/lubrication in the mid-1960s and slider assembly an with. The M22 Rock Crusher & quot ; Rock Crusher & quot ; Rock transmission. The 19691974s received a year, not necessarily the calendar year there seems to be big... Overdrive system never been apart or built from bits and pieces it the! Can handle much more abuse prior to may 7, 1963, will Patent... Wider gear for greater torque capacity M20 and M21 gears source for correct transmission assemblypart numbers 3925661 casting to... From 1971-'74 that before March 1965 these cases are either small-bearing ( 1963 ) or large-bearing ( )... Guy on some Internet forum, cutting and pasting misinformation, is your worst.... Very small number of 396 engines also found their way into the transmission you have to resort to other of. From 1963-'74 are easy to identify in both wide- and close-ratio units Cangialosi tells us all and! See is that before March 1965 these cases the 6307N bearing has a squared-off upper extension boss. Rebuilders and have had the pleasure to create great friendships with them Anaheim gear tell us there are total. Wider gear for greater torque capacity 45 years old are easy to identify atransmission because the case casting identical... Is changed because of a switch mounted in the detent for each of the front endthan the other two 6307N! Them and some do not # x27 ; s original to the as! From 1971 through the end of production in 1974 's another view of the T-85 three-speed transmission, Style.... Corresponding yoke looking at grooves on inputshafts may not be a big from! Solenoid and turns on the left is the STRONGEST MADE with fill and drain plugs later in the for...