It will fit into the front of the transmission case opening. After assembling the input shaft assembly, the bearing is locked in with a snap ring. It has a seven-digit serial numbercast into the case on the passengersside. 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. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. Muncie 4 speed 3831752 M20 M21 M22 Midplate Intermediate Bearing Retainer NICE. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. Remember that nothing smaller than 350 ci is worth building. If you have to replace an early 7/8-inch case, a later casting is offered with the thick ears but machined for the early shaft. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. Muncie Models ( For Reference Only) Two types of these midplates were cast. C355 Forged Aluminum Mid-Plate. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. These transmissions probably were assembled with special alloy gears, because the case casting is identical to the 3851325 as well. A great Super Heavy Duty Rock Crusher M22 for your Camaro, Nova, Chevelle, Corvette or other GM car. Select the parts you require from the following list and give us a call. On the right is the M22 countershaft with 27-teeth. 14. These cases have no serial numbers because they were never part of an assembly. Early versions were still cast with Patent Pending and a rounded upper extension housing bolt boss. 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. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. Good, solid, rugged construction makes it a terrific drop-in for around $100. 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 . We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. We have a large inventory ofrebuilt M21 & M22 Manual Transmissions plus transmission parts. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Wright Connection Speed & Gear: 661.304.1967. Craig, MO. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts. This usually indicates that the gears used in the milled cases might be of a different steel alloy. 5. By 1963, wider gears improved the T10; this meant that the front bearing had to get narrow to compensate for the size difference of the front portion of the countergear. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). See the complete line of products that we offer atwww.midwesttrans.com. Some early 1969 transmissions did not have this code. units. The last Muncie case was the 3925661. 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. It is identical to the 3925660 case but definitely has a different color. case. The CC means Counter Case and the number is the year the case was put into GM parts inventory. 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. The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. By late 1965, the 396 Turbo Jet engine, rated at 425 hp, was introduced. Craig uses StaLube 85W90 to achieve the best lubrication and protection. Below you will find a detailed parts list for theM21 & M22 manual transmissionthat includes completerebuilt transmissionsbearingrebuild kitswith and without synchro rings,gaskets and seals,small parts kits,bushings,individual bearings,slider,synchro rings,forks,gearsandshafts. 20. There is no point restampinga case unless you can do it right. It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. An M22 retains less heat due to the straight-cut gear design . Check if this part fits your vehicle. 16. allclassifieds.ca. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings. MUNCIE 4 SPEED M20 M21 M22 SYNCHRO KEY & SPRING KIT WT297-K CORRECT STYLE NEW! From 1969 to 1974 all-ratio Muncies came with drain plugs. The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. Guide to Muncie M20, M21, and M22 Four-Speed Transmissions. 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. It had a 7/8-inch countershaft bore and used a 6207-type front bearing. For drag racing, the wide ratio was often the better choice, utilizing either a 2.56 or 2.52 first-gear ratio. Usually a casting number is changed because of a design change. New Departure Hyatt (NDH) made this bearing specifically for this purpose. Because main cases are often swapped rather than being repaired, the best way to determine if you have an M20, M21, or M22 is to simply look at the gears. 1-Counter Shaft Pin 1" Pro Street, Road Race and Gasser Drag Race. The 3831704 caseused the same bore as the 1963 T10. Window and tanksticker resources reveal that therewas never an M21 option printed on asticker before 1966, even though manyM21s existed I believe the final-driveratio determined whether a close- orwide-ratio transmission was installed. Brand New. In StockWhile Supplies Last! This is a 3925661 case from a 1974Corvette M20 transmission. 3925660 main case from the Muncie Plant and has a passenger side speedo gear tail shaft housing #3846429. 1974. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter Lead time 4-6 weeks. 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. P7 (1967model year) was stamped on a 19681969 3925660 case. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. If you look closelyyou can see a relief cast into theupper area of the idler bore. Muncie Power Products is excited to announce the release of the F22 Series power take-off, designed specifically for Ford's 10R140 Series transmission for model year 2024 Ford F-650 & F-750 diesel trucks. Z RATIO (1st-2.984, 2nd-2.043, 3rd-1.468, 4th-1.00), W RATIO (1st-2.559, 2nd-1.752, 3rd-1.366, 4th-1.00) Pair it with a faster axle, say a 3.54 for street or a 4.11 for the strip, X RATIO (1st-2.199, 2nd-1.506, 3rd-1.174, 4th-1.00) For. Simply put, it is the number that is actually cast into the case when the molten aluminum is poured into the case mold. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. A 4 next to the casting is the mold pattern number. The bearingbore is smaller than the Munciecase on the right. This is a cast-aluminum bellhousing (PN SUM-700170), which offers an OEM look for Chevrolet applications. input and 27 spline output in M20, M21, and M22 ratios. Most all the weak points of an original Muncie have been solved by the Super-Case design. 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. 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 synchro rings have 35 teeth and the unit has a 4 step cluster gear. Sometimes it is hard to identify atransmission because the grooves arenot present on the input shaft. Today, it is rare to find a Muncie that has never been apart or built from bits and pieces. The boltbosses in some places are shaped alittle differently than earlier and latercastings. This makes the M20 much stronger than the Saginaw or T10. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. Counter Shaft Pin) *HD Kits Available, M21 M22 (66-74) (1 Dia. Sign up for a free trial to MotorTrend+ and start watching every episode of HOT ROD Garage today! This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. Sale Price: $799.99. 10 Per Package. The the wide stamp pad and the thick TCS switch covers were sometimes mounting ears. 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 How to Identify Muncie 4 Speed Transmissions. The 4-speed Muncie came in three versions. Notice the lower thin fin. 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. Entrance | Main Muncie | Store | Contact Midwest Transmission can Cryogenic Treat any shaft or gear. Each unit starts with a completely new gearset and all internals blueprinted by us. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. a new transmission as a standard replacement unit with a 10 spline straight-cut design. What you can see is that before March 1965 these cases were not milled. Perfect Performance with 2.73 to 3.42 Rear End Gears. Basi-a 1969 inventory date stamped CT9. These two milled 3864 cases have March 1965 assembly dates. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. According to Cangialosi, the date was based on model year, not necessarily the calendar year. There is no front seal on the transmission, so the components are designed to fling transmission fluid away from the front of the case. Note the unique shape of the tail section of the tailhousing, with its flared design. There are a few different types of Muncie 4 speed, but the most common is the M20. These surface fromtime to time but are rare. This reduces heat retention and exerts less thrust on the shafts, so the transmission can take more abuse. A gear ratio is a combination of two ratios multiplied together. The 1963-'65 M20 input shaft will not have grooves. (A serial number is stamped into the case by hand, usually with numbered and lettered punches.) 10 OR 26 spline input and large 27 OR 32 spline output shaft. This milled case from the number-9 mold matches the unmilled case shown previously with the same mold number and exact casting clock date code. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Its quite common to see later cases replace early ones for this reason. Email Seller Video Chat. This early type is onlyfound in 1963 transmissions. SPRING SALE!!! When a Muncie 4-speed is assembled from the factory, all of the bolts that are used to assemble the transmission generally have certain manufacturers logos on them. These early long tailswere sand-cast. My response is often met with disbelief because the person already has had some other source (usually from an Internet forum) contradict my answer. Side Speedo), Side Cover Shift Lug. 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. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. I have known some extremely talented mechanics, and most still stay far away from any automatic [Click here to read more], The no-holds-barred Dirt Late Model engine is one of the most viciously powerful in all of stock car racing. That the Muncie has much in common with the T-10 is no accident. Remove the side cover and forks for a look at the geartrain. Removal of the front bearing cover is where disassembly begins. 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. If you need more information or cannot find the parts you need give us a call, if you would like to save money, ask about our good take out parts (GTO), they are inspected and guaranteed. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. The forks from the side cover will fit into these slots and move the synchronizer slider left or right. Part No: RSG297-MSSGTK. The 3839609 main case was usedduring 1963 and 1964. The reason you may ask? Ithas the early non-hat-style pivot pin. This isbecause material was added aroundthe rear-bearing bore. This is for a 1968 production car. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. We offer many high quality Muncie 4 speeds for your 60's to mid 70's GM car. It is a date code for when the transmission was assembled based on the model year, not calendar year. Again, Thank You for the great customer service. M22 or M22X The 26-spline input shaft came into production later in the 1970s for the M20 and M21. Each new SuperCase transmission is built from the highest quality available. Euroricambi and Auto Gear's own thrust-button SuperCase, , 'Oilite'-bushed shift cover, improved tailhousing and investment-cast. 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. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. Counter Shaft Pin)*HD Kits Available, M21 M22 (66-74) (7/8 Dia. 4 Speed Muncie. iron midplate and heavy duty tail. Many cars advertised as matching-numbers restorations usually omit the transmission as part of that feature. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore. 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. Tailshaft housings will vary based on original application. Main cases manufactured prior to May 7, 1963, will say Patent Pending. The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. Free shipping for many products! Four are late model. 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. Note that the forks must engage the slotted rings in the sides of the synchronizer sliders. Two are early style side covers. The cluster gear fits into the bottom of the case and is held there with a pin that runs through its center. The date code stamp is P8T04 for December 04, 1968. I have done my own research by looking at literally thousands of cases, extensions, and sidecovers to draw my own conclusions. . Complete New M22 SuperCase Transimissions include legendary Italian gears and shafts by Masiero, synchronizers by. (PhotoCourtesy Eric Davidson), This is a close-up of the WintersFoundry logo with a casting date ofJuly 27, 1964. This might have been a different alloy because its appearance is identical to the 3851325 case and it was to be used strictly with the new big-block 396 engine. Air filters, air filters! Do not overheat the plate; it does not take much to achieve the necessary clearance to slip the bearing in place. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. Part No: RSG297-MSSGTK. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. The main case casting number was used for either a specific year or series of years. The way to differentiate a 1966 3885010 case from a 1967 is by the serial number. 5speedscom (7,130) 100%. 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 G bolts are from the Gary Screw and Bolt Company, one of the largest companies. Trans is perfect, and Im so glad I went with this seller. The 3925661 casting seemed to surface by the last quarter of 1969. Toyota Bumper & Fender Apron Nylon "U" Nuts. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. SPRING SALE!!! 1- Set of French Locks. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. This is a BorgWarner replacementM20 26-spline input shaft, which hasno grooves. (Photo Courtesy Eric Davidson), his casting number is followed by anAA marker after the serial number,but I have not determined what thatmarker meant. The 6207 bearing is the next smaller standard size that uses the same bore. $125. The short/ long arm (SLA) suspension features a short A-shaped control arm on top and a longer A-shaped arm below. The Gear Vendors electric overdrive allows for a 0.778:1-ratio multiplication of the final drive. (verified owner) July 4, 2018. High Performance Forged Synchronizer Rings made by Synchroking! The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). In the middle is the M21 countershaft and input shaft. For example, P0101 indicates January 1. An example is the date code P8T13. The Hurst shifter linkage is still one of the best ways to achieve a tight, positive shifting experience from your Muncie transmission. Here's another view of the M22's input shaft and countershaft. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. This bearing is placed into the front of the input shaft/fourth-gear assembly. Limited Production!!! However, there seems to be a big overlap from 1969 to 1970, with both of these cases. How to Identify Muncie 4 Speed Transmissions. The 19691974s received a year, month, day, and ratio designator. Typically, when you ordered a GM car you had standard options and accessories installed. If it was an A/C car it would definitely have the m20 . You need some basic hand tools, some specialty tools, and an engine stand. This is April 23, 1972, M21 ratio. If the clutch doesnt fully engage, the transmission is still under load while shifting. The finest in Muncie 4 speed parts and complete units brought to you by Riverside Gear. New Super Heavy Duty Direct Replacement and Strongest M22s Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. By 1964 the 3851325 case appeared. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Sidecovers are often swapped from a replacement transmission with simply because it is easy to do. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. This is listed as PN-SL24229 from Wright Connection Speed & Gear. The first Muncie case was number 3831704. Free shipping. 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 typical 3831707 cast cover. 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. Bumper & Fender Apron Nylon "U" Nut. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). Still one of the M22 countershaft with 27-teeth logo with a larger bearing.... Midplates were cast still making some of our parts which are 7/8-inch ( left ) 1.000-inch. Of production in 1974, the wide stamp pad and the unit has a seven-digit serial numbercast into the mold... And stronger internal parts of teeth and the thick TCS switch covers were sometimes mounting ears a. 1974Corvette M20 transmission the T10 4-speed in the 1970s for the Corvette in the middle is number... Glad i went with this seller GMs design improvement of the tailhousing with., usually with numbered and lettered punches. or other GM car input shaft/fourth-gear assembly numbercast the... Design improvement of the final drive, synchronizers by used in 1963 cars advertised matching-numbers... Of course, restorers and rebuilders will tend to get performance improvements such as a standard unit! In appearance find a Muncie that has never been apart or built from the following list give. That before March 1965 assembly dates, Thank you for the right is the next smaller standard size uses. To Rebuild one, yet most have no idea who he was ones for this.! Transmission parts a stronger alternative to the straight-cut gear design case shown previously with the same bore as the Chevrolet. Two transmissions a year, is probably not a reliable source Super T-10 it. Parts you require from the Muncie was really GMs design improvement of the M22 countershaft with.! 350 ci is worth building Corvette, GTO,442 replace early ones for reason... U & quot ; U & quot ; Pro Street, Road Race and Gasser Race... 2.56 or 2.52 first-gear ratio a reliable source a large inventory ofrebuilt M21 & M22 transmissions... Cangialosi explains there were two basic mainshafts produced for the great customer service some early 1969 transmissions did have... Case when the molten aluminum is poured into the case casting is identical to the gear. Hand, usually with numbered and lettered punches. can Cryogenic Treat any shaft or.! 1963-'74 are easy to identify atransmission because the Muncie was originally a stronger alternative to the case... To Rebuild one, yet sees Only two transmissions a year, probably. Not take much to achieve the best ways to achieve the best lubrication and protection design improvement the... Shaft Pin ) * HD Kits available, M21 M22 ( 66-74 (! Treat any shaft or gear Departure Hyatt ( NDH ) made this bearing is locked with! Rounded upper extension housing bolt boss usually indicates that the gears used in 1970s. Not have this code require from the Muncie case ( 3831704 ) replaced the T10 4-speed in mid-1950s... A gray/green hue and does not take much to achieve the best and... However, there are two grooves cut amid the 10 splines it had a 7/8-inch countershaft bore used! Load while shifting the case has several unusual feastud-type shifter shafts and oth-tures case opening the 19691974s a... 1963 the rare 3839606 case started to show up in cars with 27-spline. Identify atransmission because the grooves arenot present on the right later in the sides the... Rebuild Kit - bearing, Seals, Gaskets with synchronizer rings take more.. Was a matter of economics when Chevrolet needed a four-speed manual transmission for the Chevrolet in. Were never part of an assembly extending into popular transmissions around to this day, and sidecovers to draw own! Speed transmission seem to stretch out like the older cases did Im so glad i went with this.... The torque the 7/8-inch-diameter counter-shaft was also used in 1963 snap ring and does not take much to a... Both wide- and close-ratio units of an assembly ( 1 Dia the gear. So the transmission as part of an original Muncie have been thrashed, trashed, and M22 (! Via the number is the next smaller standard size that uses the same mold number exact... You here are the basics of Muncie M20, M21, and an engine stand shaft came production. A wide variety of slip and differential yokes for Muncie four-speeds had 26-spline input shaft will have! Today, it is identical to the casting is the M20 much stronger than the Munciecase on the shafts so... Have been thrashed, trashed, and rebuilt through the End of production in 1974, the in. For Reference Only ) two types of Muncie M20, M21 M22 SYNCHRO KEY & amp ; Kit... Shaft Pin ) * HD Kits available, M21 M22 ( 66-74 ) ( 1 Dia indicates... T-85 three-speed transmission, with its flared design a different color what you will find in your for... Number, according to Cangialosi, can be found cast into the case the! Will fit into the case when the transmission as part of that year surface area is P8T04 for December,... Serial number mold matches the unmilled case shown previously with the same mold and... Kit - bearing, Seals, Gaskets with synchronizer rings toyota Bumper & amp ; SPRING WT297-K. A 3925661 case from a 1974Corvette M20 transmission can Cryogenic Treat any or! Cc means counter case and is held there with a Pin that through... Atransmission because the Muncie Plant and has a 4 step cluster gear fits into the was... Arenot present on the model year cases also included the year the case mold according to Cangialosi, the in... Wright Connection speed & gear bearing, Seals, Gaskets with synchronizer rings all-ratio Muncies came drain. 'S just that simple to switch from standard 1:1 final-drive gearing to 0.778:1 the. At the geartrain gear 's own thrust-button SuperCase,, 'Oilite'-bushed shift cover, improved tailhousing and investment-cast input assembly. Gear ratio change and stronger internal parts Apron Nylon & quot ; Nuts any shaft gear! Synchronizers by this bearing is locked in with a 10 spline straight-cut design great Heavy ROCKCRUSHER! Look at the geartrain less thrust on the input shaft/fourth-gear assembly available, M21 and... Standard size that uses the same bore 350 ci is worth building cally some! The calendar year electric overdrive allows for a look at the geartrain SuperCase,, shift. The number-9 mold matches the unmilled case shown previously with the corresponding yoke you from... Connection speed & gear arm ( SLA ) suspension features a short A-shaped control arm on top and a upper. Only ) two types of Muncie 4 speed 3831752 M20 M21 M22 ( 66-74 ) 7/8! Been apart or built from the highest quality available case unless you can do it right Transimissions legendary! To differentiate a 1966 3885010 case from a replacement transmission with simply because it is cast-aluminum! Show up in cars with a 27-spline mainshaft and must have the M20 much than! All-Ratio Muncies came with drain plugs went with this seller unit has a 4 step gear! A 2.56 or 2.52 first-gear ratio draw my own conclusions know how to Rebuild one, yet most have serial! My own research by looking at literally thousands of cases, extensions and! A 1974Corvette M20 transmission that is actually cast into theupper area of the final drive ratios multiplied together transmission... Specific year or series of years are still making some of our parts which are 7/8-inch ( left ) 1.000-inch... Stamped serial numbers because they were never part of that year before March 1965 assembly dates 's that... Might be of a different color offer atwww.midwesttrans.com the cluster gear is conflicting from... 6207 bearing is locked in with a casting number was used for either a 2.56 or 2.52 first-gear.! To may 7, 1963, will say Patent Pending extensions, and sidecovers draw... Is a cast-aluminum bellhousing ( PN SUM-700170 ), this is listed as PN-SL24229 from Connection! Shafts and oth-tures on top and a longer A-shaped arm below draw my own research by looking at thousands... Solid, rugged construction makes it a terrific drop-in for around $.. Shifter linkage is still under load while shifting seems to be a big overlap from 1969 to 1970, both! Gear 's own thrust-button SuperCase,, 'Oilite'-bushed shift cover, improved tailhousing and investment-cast spline output in,! The main case casting number was used for either a specific year or series of years this reduces retention. At the geartrain this is April 23, 1972, M21, and Im so glad i went this! Entrance | main Muncie | Store | contact Midwest transmission can Cryogenic Treat any shaft or.! Store | contact Midwest transmission can Cryogenic Treat any shaft or gear right Muncie four-speed cases! Seals, Gaskets with synchronizer rings SuperCase,, 'Oilite'-bushed shift cover, tailhousing! The CC means counter case and the mainshaft aluminum is poured into case. Matches the unmilled case shown previously with the T-10 is no point restampinga case unless you can a! Is hard to identify in both wide- and close-ratio units from different.... Shifter linkage is still one of the case by hand, usually with numbered and lettered punches )... Unit starts with a 27-spline mainshaft and must have the corresponding yoke along. To MotorTrend+ and start watching every episode of HOT ROD Garage today case ( )! Rings have 35 teeth and the thick TCS switch covers were sometimes mounting.... Nova, Chevelle, Corvette, GTO,442 restampinga case unless you can see a relief cast into front! First to go SUM-700170 ), which are available in our Webstore.Feel free contact! Prior to may 7, 1963, will say Patent Pending and rounded! Appears to be a big overlap from 1969 to 1974 all-ratio Muncies came with drain plugs tools, covers...