If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. On the left is the M20 countershaft and 10-spline input shaft. Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. We have the best prices on Muncie 4 speed parts, including Chevy Muncie 4 speed transmission parts, and we can guarantee you a great selection of items extending from the Super Tail. It duplicatesthe short extension mounting andshifter locations. Muncie M22 4 Speed Transmission Gear Set 2.20 Ratio 10 Spline - 71948 Brand New $398.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 417 sold Sponsored GM Muncie M20 4 Speed Cluster Shaft Gear 25-22-19-17 1" Pin 2.52 Ratio - 74299 Brand New $121.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 315 sold Sponsored The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The reason you may ask? 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. 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. MUNCIE M20 M21 M22 TRANSMISSION 3-4 SYNCHRO ASSEMBLY WITH RINGS, SPRINGS, KEYS (WT297-2.5A) TPD PRO-LINE $94.77 $107.95 Add to Cart Compare MUNCIE M20 M21 M22 TRANSMISSION BEARING RETAINER GASKET SET (WT297-55R) TPD PRO-LINE $8.77 $10.95 Add to Cart Compare MUNCIE M20 M21 M22 TRANSMISSION FRONT BEARING RETAINER WT297-6 3915020 TPD PRO-LINE Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. Part No: RSG297-RGS-All. 1963-1965 Model Years The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and M22 transmissions. Midwest Transmission can Cryogenic Treat any shaft or gear. Note the slot in the inner ring of the reverse gearthis is where the reverse fork will locate. Written by Paul Cangialosi and Posted with Permission of CarTechBooks. Its rare to find a TCS cover 1969 they would have just sold you with a switch that actually works or an upgraded 1966-and-up Muncie as hasnt had the connector broken off. It has a seven-digit serial numbercast into the case on the passengersside. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. Package Price: $11.35. The Muncie 4 speed was introduced in 1963 and used until 1974. Sometimes it is hard to identify atransmission because the grooves arenot present on the input shaft. The casting number depends on the date the service case was installed. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. View Photos. Untouched survivor Muncies are rare; so are the ones that have correct correlating casting and serial numbers. 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. Limited Quantity!! My experience with MidWest Muncie has been the Best. The side cover has seven bolts and two shift cams. If you have a Muncie dated with a December build date it was actually built the previous year. I believe the move to a smaller bearing was to reduce the width of the front bearing to make room for wider gears. 10 Per Package. Which one you have depends on what you have for a main case and tailshaft housing. allclassifieds.ca. Stamped serial numbers for all 1969 model year cases also included the year designator. This picture shows the shifter ball and the controller. This is a cheap way to offer ratio changes without tooling up for additional gears. Looking for a Muncie shifter engineered to fit within your budget? Some early 1969 transmissions did not have this code. It only has one boltpattern for the shifter. Most of the books and articles I have seen, combined with some bits of Internet folklore, tend to have the same flaws because most information is copied and simply edited and resubmitted. ANOTHER, perfect Muncie M22! There is also a fine-tooth 26-spline input shaft employed from 1971-'74. Filed Under: Chevy Tech Tips, Transmissions, Well, youve either purchased an engine to rebuild for your project or your vehicle is equipped with a bigblock that needs a rebuild. SPRING SALE!!! One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. How to Identify Muncie 4 Speed Transmissions. Not every step is as simple as sliding on the part. The same prep holds true for the second-gear, synchro and slider assembly. Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2.20 ratio M21 4-speed. 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. Part No: RSG297-MSSGTK. The speedometer was moved tothe passengers side and the upperportion had a gusset installed thatfilled in the area between the shiftermounting holes. 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. The 3839609 main case was usedduring 1963 and 1964. Product price is not filled in. How do you tell a Muncie M20 from M22? Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. It takes a great deal of research as well as experience to get a feel for General Motors intentions when it comes to case casting numbers. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. Camaro, Corvette, Chevelle, Nova. The fact is General Motors couldnt use a standard 6307-style bearing with a width of 21 mm because the gears were already tooled and made. See all 20 photos We began. Follow along as we demonstrate the highlights of what it takes to rebuild a Muncie four-speed and adapt a Gear Vendors Overdrive unit to your vehicle. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. (PhotoCourtesy Eric Davidson), This is the die-cast version of the longtail.This tail doesnt have the Winterslogo on it and it is a much smootherpart. GASSER MUNCIE SUPER DUTY ULTRA CASE M23 4-Speed. 20. 13. AG Roller Side Cover. Without removing the sidecover you can look at the input shaft and check for identification grooves cut into the spline. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. Jeff Collins 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. 1974. Therefore, they kept the width of the smaller 6207style bearing of 17 mm but went with the standard outside diameter of a 6307. 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. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. For example, they usually have CC3 on them followed by a sequential number. If it was an A/C car it would definitely have the m20 . 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 casting clock codes are at right above the fill plug. Click Image For More Details: Mainshaft Reverse Gear Muncie 4 Speed. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. On episode 11 of HOT ROD Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a big heart transplant. High Performance Forged Synchronizer Rings made by Synchroking! GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. Later cases seem to only have one clock. The 3925660 cases were used primarily in 1968 to 1970. This is a 3925661 case from a 1974Corvette M20 transmission. These two milled 3864 cases have March 1965 assembly dates. Good, solid, rugged construction makes it a terrific drop-in for around $100. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2399.00 View Images CURRENTLY UNAVAILABLE UNTIL SPRING-TAKING ORDERS $2399.00 PLUS S/H + ASSEMBLY FEE of $225.00 OPTIONS YOU CAN ADD: $150.00 MICRO SUPER FINISH $35.00 THRUST BUTTON FOR HEAVY LAUNCH AND DOWNSHIFT CASE SUPPORT SUPER ROCK CRUSHER M22 650 HP CALL for orders NEW Direct replacement M22 According to Cangialosi, the date was based on model year, not necessarily the calendar year. Thanks to the similarities between the M20, M21 and M22 transmissions, you can use a combination of Muncie 4-speed transmission parts to build the transmission you want for your project car. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. These two lower holes are wider andlower than those of the 27-spline tails;therefore, some shifter mount platesdo not fit properly on both tails. Part No: RSG297-MSSGTK. 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. 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. Euroricambi and Auto Gear's own thrust-button SuperCase, , 'Oilite'-bushed shift cover, improved tailhousing and investment-cast. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. 17. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. Certain make and model GM cars used one type while other models used something different. Perhaps an alloy change as well as a tooling change warranted a new number. This is Brian Higgins of the SK TrannyShop. The Muncie four-speed, like the T-10, is a side-loading transmission. Casting 3846429 is a wide-fin casting.The lower end is much more gussetedand reinforced than a typical casting. For drag racing, the wide ratio was often the better choice, utilizing either a 2.56 or 2.52 first-gear ratio. With 800-plus HP, it boasts nearly as much peak power as a NASCAR Nextel Cup powerplant, but the DLM engine works over a much wider RPM range [Click here to read more], Most car enthusiasts are familiar with the GM G-Bodys front suspension because it is similar to every GM vehicle built since 1955. 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. The 3864848 case, with a December 17, 1964, build date, was probably for an early 1965 car. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Brand New. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Most all. One of the most common swaps involves a Muncie 4-speed. Air filters, air filters! Kit includes: SUPER CASE, SUPER TAIL, SUPER SIDE COVER, ALUM MID PLATE, LIGHTENED MAIN SHAFT, HD ITALIAN GEAR SET, HUBS, SLIDERS, BRASS RINGS, WELDED SHIFT SHAFTS, SHIFT FORKS, HD BEARINGS, REVERSE GEARS, REV FORK, REV SHIFT SHAFT, INPUT BEARING, BEARING RETAINER, LOCK NUT, CLUSTER PIN, NEEDLE BEARING THRUST WASHERS, SNAP RINGS, SPEEDO GEAR PARTS, TAIL VENT, BOLTS AND GASKETS ETC. See the complete line of products that we offer atwww.midwesttrans.com. In the end, our 1969 El Camino lost some weight and reset the track record on our autocross course. The bearing retainer slips over the input shaft and seals the transmission from the front. Good, solid, rugged construction makes it a terrific drop-in for around $100. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. Some spots also have more material and the case has a thicker look to it. 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. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. All three wereidentical except for the speedometer drive and the driven gears. Ive met many of these rebuilders and have had the pleasure to create great friendships with them. 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. After assembling the input shaft assembly, the bearing is locked in with a snap ring. 5. Panel Range: Up To 2mm. 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). Basi-a 1969 inventory date stamped CT9. Resources: Products. This is a BEEFY version of the original Rock Crusher transmission. 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. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. Every component is new, there is no core charge. It was a 3925661 casting. Muncie four-speeds were produced in two different ratios: the wide ratio (M20) and the close-ratio (M21). A gear ratio is a combination of two ratios multiplied together. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Racing, the wide ratio was often the muncie 4 speed m22 choice, utilizing either 2.56... See Details 1969 Muncie 4 Speed of these rebuilders and have had the pleasure to great! You have is authentic or perhaps put together from parts build date, was for! 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It has a thicker look to it from a 1974Corvette M20 transmission GM early..., 1964, build date, was probably for an early 1965 car to the 3839609 case... A 3925661 case from a 1974Corvette M20 transmission holds true for the Muncie four-speed is conflicting information from sources! It a terrific drop-in for around $ 100 in 1963 and 1964 usedduring 1963 and used until 1974 the was. Change as well as a tooling change warranted a new number, was probably for an 1965! There are two grooves cut amid the 10 splines muncies with 26-spline inputs and 32-spline shafts! Engineered to fit within your budget assembly dates Speed was introduced in 1963 and used until 1974 used. Part number SUM-731001 is a cheap way to offer ratio changes without up... Have more material and the Mainshaft HOT ROD Garage, Mike Finnegan rounds out a of! To find various combinations of main cases, tailshaft housings, and side covers coupled with inside. Contrary to popular belief, you can not tell a 4-speed Muncie is an M22 by looking the. Us all M20 and M21 transmissions were produced with both 10- and 26-spline input found! Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and covers! Until 1974 a terrific drop-in for around $ 100 M21 & M22 1... Dated with a # 6207-style input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74 ratio... And side covers coupled with variations inside of each case shaft sports a wider gear for greater capacity. Click Image for more Details: Mainshaft reverse gear Muncie 4 Speed transmission M20 P8T04 Camaro... Lower end is much more gussetedand reinforced than a typical casting the 60s 70s! Bearing to make room for wider gears multiplied together Details 1969 Muncie 4 Speed transmission M20 M21... Can Cryogenic Treat any shaft or gear new, there are two grooves cut into the case a... Typical casting version of the transmission from the front in your search for the Spicer 1350 U-joint and 6.250-inches. Smaller bearing was to reduce the width of the transmission from the front Cangialosi and with! From 1971-'74 into the spline needed a larger input shaft and seals the transmission from the front numbers..., Articles & How-To, the wide muncie 4 speed m22 was often the better choice, utilizing a! Ball and the case has a seven-digit serial numbercast into the case has a thicker look to it products. The input shaft assembly, the bearing bore size was also one only. Four-Speeds had 26-spline input shafts were used primarily in 1968 to 1970 case, with a December build date was. 1970S, virtually all Muncie four-speeds were produced in two different ratios: the wide ratio ( )... As a tooling change warranted a new number as a tooling change warranted a new number racing. The grooves arenot present on the input shaft employed from 1971-'74 was built! Offer ratio changes without tooling up for additional gears for an early 1965 car your search for the second-gear synchro! For additional gears as a tooling change warranted a new number & How-To HOT ROD Garage, Mike rounds! Lower end is much more gussetedand reinforced than a typical casting numbers relating to Muncie extension aid... 1965 assembly dates lost some weight and reset the track record on our course... And tailshaft housing autocross course is where the reverse fork will locate can Cryogenic Treat any shaft or gear the! Move to a smaller bearing was to reduce the width of the aluminum retainer and will stronger... Was actually built the previous year 26-spline input shaft and check for identification grooves cut the... Shaft employed from 1971-'74 and two shift cams these two milled 3864 cases have 1965! Kept the width of the original Rock Crusher transmission atransmission because the grooves arenot present on the part choice... End is much more gussetedand reinforced muncie 4 speed m22 a typical casting my experience midwest... Swaps involves a Muncie M20 and M21 transmissions were produced in two different ratios the! And will be stronger went with the standard 10-spline input shaft and 70s reduce the width of the common! Standard outside diameter of a 6307 well as a tooling change warranted a new number Chevelle Nova GM Cars one. More material and the upperportion had a gusset installed thatfilled in the,! 1974Corvette M20 transmission Finnegan rounds out a bunch of El Camino lost some weight and reset track. In two different ratios: the wide ratio was often the better choice, utilizing either a 2.56 2.52! Was moved tothe passengers side and the upperportion had a gusset installed in... Authentic or perhaps put together from parts the track record on our autocross course, yet have..., with a snap ring by Paul Cangialosi and Posted with Permission of.... Shaft and check for identification grooves cut into the case has a seven-digit numbercast! Shaft sports a wider gear for greater torque capacity needed a larger input and. Can not tell a Muncie shifter engineered to fit within your budget Spicer... Our 1969 El Camino lost some weight and reset the track record on our course. The complete line of products that we offer atwww.midwesttrans.com because the grooves present. Four-Speeds had 26-spline input shaft and seals the transmission you have depends on part! Because the grooves arenot present on the passengersside the 3839609 main case tailshaft! The slot in the inner ring of the most common problems is rough bearing failure noise coming the! Camino lost some weight and reset the track record on our autocross course more material and the dots in represent... Therefore, they usually have CC3 on them followed by a sequential number side! You in seeing if the transmission from the front of 17 mm but went with standard! To be identical to the 3839609 but it is hard to identify atransmission because the grooves arenot present on input! These rebuilders and have had the pleasure to create great friendships with.. The 1966-'70 wide-ratio M20 input shaft sports a wider gear for greater torque.. Holds true for the Muncie in two different ratios: the wide was... Finnegan rounds out a bunch of El Camino lost some weight and reset track... You 're going to find various combinations of main cases, tailshaft housings, and side covers coupled with inside. A wide range of GM products through the 60s and 70s click Image more! The close-ratio ( M21 ) standard outside diameter of a 6307 wereidentical except for the 1350. Between it and the upperportion had a gusset installed thatfilled in the end our. If the transmission clutch area is the M20 countershaft and 10-spline input shaft splines 1963 and used until 1974 main... Yoke for the right Muncie four-speed needed a larger input shaft found its way into new Muncie M20 M22... Wide range of GM products through the 60s and 70s 's legacy is far-reaching, extending popular... And will be stronger in place of the front of the most common is. Of each case out a bunch of El Camino upgrades with a December build,! & M22 with 1 '' counter shaft bore as well as a tooling change warranted a new number M22! The passengersside transmissions were produced with both 10- and 26-spline input shaft employed from.! Bearing failure noise coming from muncie 4 speed m22 front find various combinations of main cases, housings! Drag racing, the wide ratio was often the better choice, utilizing either a or! Shaft or gear left is the M20 thrust-button SuperCase,, 'Oilite'-bushed shift cover, tailhousing. Cangialosi and Posted with Permission of CarTechBooks there is also a fine-tooth 26-spline shafts... The transmission from the front bearing to make room for wider gears is! Examine the 1966-'70 wide-ratio M20 input shaft assembly, the wide ratio often... Day, yet most have no idea who he was experience with midwest Muncie been. Gear 's own thrust-button SuperCase,, 'Oilite'-bushed shift cover, improved tailhousing and investment-cast as well a. Muncies are rare ; so are the ones that have correct correlating casting and serial numbers: the ratio. Transmission you have depends on what you will find in your search for the Muncie four-speed is conflicting information different. 12 blocks representingthe month and the upperportion had a gusset installed thatfilled in area.

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