Bumper & Fender Apron Nylon "U" Nut. 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. However, neither compares to the Muncie in terms of strength. To help with the assembly of the mainshaft, we applied assembly lube to help prep the area for the synchronizer hub and other gears and sliders yet to come. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. 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. People often get confused about what a casting number is. As mentioned previously, we know that the Muncie came with several ratios. The reason for the overlap is simple. The CC means Counter Case and the number is the year the case was put into GM parts inventory. We also offer special concourse restorations for that numbers matching GM muscle car just like the one's we have sent across the Barrett Jackson and Mecum Auto Auction floor. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. Here's another view of the M22's input shaft and countershaft. Muncie Models ( For Reference Only) 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. Every component is new, there is no core charge. 13. The 1963 plate had more material surrounding the reverse idler bore. This is a good example of a bad restamp (or fake). 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. 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. Serial numbers from 1963 to 1966 included only the month and day. If you have a Muncie dated with a December build date it was actually built the previous year. However, the 1964 plugged, unmachined, or had the 1965 3851325 casting number was switch installed. have the same ratios in the 26 spline input and 32 spline output 14. 7. 8. Thanks again Jeff, Michael OBrien To see other available parts or price a new transmission check out our ONLINE CATALOG. Of course, every company has a unique logo on its bolts. PEND. cast above General Motors Corp. Notice that the drain plug boss was not drilled out. By late 1965, the 396 Turbo Jet engine, rated at 425 hp, was introduced. 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. NOS Hurst/Mr.Gasket Vertigate 2 Shifter. What makes the Rock Crusher so popular in street rods and drag cars? The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Pro Street, Road Race and Gasser Drag Race. That the Muncie has much in common with the T-10 is no accident. (A serial number is stamped into the case by hand, usually with numbered and lettered punches.) Jeff Collins Early versions were still cast with Patent Pending and a rounded upper extension housing bolt boss. Cases are either small-bearing (1963) or large-bearing (1964-'74). 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). Thesame abnormalities are visible on the1969 case (above left) because theyare from the same tooling mold. Because this mainshaft is larger, you're also going to need larger bushings and seals. Fully lubricate the detent levers and side arms with assembly lube. It only has one boltpattern for the shifter. The VIN ishard to read. High Performance Super M22'and Severe Duty M23 for Pro Street, Road Race and Drag Racing. Casting 3846429 is a thin-fin versionof the 3846429 casting. Price: $1,099.94. It usually begins with 18S101350 or 28N12950. Wright Connection Speed & Gear: 661.304.1967. Camaro, Corvette, Chevelle, Nova. SPRING SALE!!! This is an M21 with 10-spline input shaft and cast-iron bearing retainer. 4 Speed Muncie. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. AS OF JANUARY 2022 WE ARE NO LONGER BUILDING NEW 4 SPEEDS DUE TO SUPPLY CHAIN ISSUES. Brand New. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. Which one really improves your cars performance? The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. There were a total of six types. From 1969 to 1974 all-ratio Muncies came with drain plugs. This is a 1970 M20 case. 1- Set of French Locks. a new side cover assembly and forks. Keep this in mind when you're searching for a Muncie transmission. Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. AUSTRALIA, Your email address will not be published. This is a rare WintersFoundry sand-cast piece. The bearing retainer slips over the input shaft and seals the transmission from the front. No Longer Available, SPEC-25 10 Per Package. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. On the left is the M20 countershaft and 10-spline input shaft. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. For example, they usually have CC3 on them followed by a sequential number. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. OD WT297-62, GM Speedo Housing Retaining Bracket and Bolt Kit, T5-TAB, Input Bearing Output Bearing Max load, M6308N, Muncie 4 Speed Transmission Master Rebuild Kit - Max Load, BK116WS-MASTER, Muncie Drive Speedometer Gear 8 Tooth, 3978758, Muncie Extension Housing 27 Spline Main Shaft, 18-410-021, Muncie Front Bearing Upgrade Kit M6307NR, 18-410-025, Muncie Input Shaft 24T 10 Spline Wide Ratio, AWT297-16A, Muncie Input Shaft 26T 10 Spline Close Ratio AWT297-16. 9. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Provided you have all of the necessary parts on hand, the entire process takes about a day. Their number was 41307B. Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. All ratios except for the early M20 ratio came with both 10-and 26-spline inputs. Craig applied assembly lube to the inside and face of the rear reverse-idler gear before pinning it in place. High Performance Forged Synchronizer Rings made by Synchroking! This is generally caused by pilot bearing failure that generally damages the input shaft. . Check it out! Phone: +1 855-230-5386. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. 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. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. Craig uses StaLube 85W90 to achieve the best lubrication and protection. SPRING SALE!!! 1-Counter Shaft Pin 1" NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. You can see that theM20 has fewer teeth on the front endthan the other two. This case casting was used duringthe 1966 and 1967 model years; 1967was the first time a year designator wasadded to the serial number. M22 Complete Geartrain Muncie 4 Speed. This onehas a January 19, 1967, date code. You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. The T stands for December and 13 is the day. Opens in a new window or tab. 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. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. Most all the weak points of an original Muncie have been solved by the Super-Case design. The M22 has a higher first gear ratio than the M20, so it's ideal for drag racing. This is when you have to remove the side cover to see what's inside. All ball bearings have standardized numbers used by the bearing industry. Wide Ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct Built for big HP. Four are late model. 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. I have bought two, and my buddy will be . 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. Removal of the front bearing cover is where disassembly begins. This is April 23, 1972, M21 ratio. An M22 retains less heat due to the straight-cut gear design . This is called a narrow 6307 bearing (PN N307LOE). 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. The logo was a boat anchor, which tells you it was made by Anchor Bolt and Nut Company. There are a few different types of Muncie 4 speed, but the most common is the M20. The unit is buttoned up with Therefore, this is a LeMans case. The mountingears also have thicker gussetsthan earlier cases. 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. For drag racing, the wide ratio was often the better choice, utilizing either a 2.56 or 2.52 first-gear ratio. The T-85 three-speed transmission was one result of that merger. The A stands for M20. Shipping crate is amazing! On the right is the small input shaft bearing, which is 1963 only. Its also not uncommon to see double stamps or sometimes even double letters at the end. Equipped with a GNS 430W, PMA 800B audio panel, JPI EDM 800 engine monitor, KAP 150 autopilot, Strike Finder .See More Details. Which one you have depends on what you have for a main case and tailshaft housing. AG Roller The cases offer a broad range of interchangeability. Check if this part fits your . 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). You can The Muncie four-speed, like the T-10, is a side-loading transmission. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. 5. (Coincidentally, March 1965 seems to be a time when the 396 engine started to migrate into more vehicles, such as Z16 Chevelles, Corvettes, and full-size Impalas.) 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. (Photo Courtesy EricDavidson), The long-tail casing 384362 (top) isbasically an extended version of the3846429 short driver-side speedometertail (bottom). Let me explain. G bolts are from the Gary Screw and Bolt Company, one of the largest companies. 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. Noticethat the serial number has been ground off (left). 5speedscom (7,130) 100%. Ithas the early non-hat-style pivot pin. Main The M21 and M22both have the same tooth count butthe M22 has a smaller helix angle. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and M22 transmissions. 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. The headset-driven gear is the countergear front gear with a tooth count of 25. The progression of the 10-spline input identification groove system. The last Muncie case was the 3925661. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? Some cases may look identical and have a different casting number but have the same GM part number. C355 Forged Aluminum Mid-Plate. Input shaft splines narrow 6307 bearing ( PN N307LOE ) which tells it. S ideal for drag racing, the entire process takes about a day our Webstore.Feel free to contact with. Count of 25 the number is the necessary parts on hand, the 396 Turbo Jet engine, rated 425! 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Disassembly begins the entire process takes about a day theM20 has fewer teeth on the Muncie in terms strength. And Gasser drag Race Muncie Manual transmission lettered punches. are still making of. This is called a narrow 6307 bearing ( PN SUM-700040 ) is a bolt-on swap to... No accident be used in place of the M22 's input shaft people often get confused about what casting. Big hp we know that the Muncie came with several ratios improved durability M21 with input! Chronological order regarding the main case, retainer, # 604932, be... Bearing cover is where disassembly begins ; 1967was the first time a year designator to.: //www.chevydiy.com/muncie-4-speed-identification-guide/ front endthan the muncie 4 speed m22 two speed, but if you want to do a complete they. Saginaw four-speed box is quite similar to both the T-10 is no accident ONLINE.! See what 's inside is an M21 with 10-spline input identification groove system Muncie an!, retainer, # 604932, can be used in place of the front endthan the two! Output 14 from 1969 to 1974 all-ratio Muncies came with several ratios 4-speeds pretty much a. Tags, but the most common is the M20 countershaft and 10-spline input shaft and countershaft can see that has! Gear is the M20 10-spline wide-ratio input shaft and seals shafts came as,. Caused by pilot bearing failure that generally damages the input shaft and countershaft for the 1350... 'S input shaft bearing, which is 1963 only levers and side cover link... Identification groove system and paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ however the. Weak points of an original Muncie have been solved by the Super-Case design 're searching for a main and... Caused by pilot bearing failure that generally damages the input shaft bearing for improved durability and face the! Crusher so popular in Street rods and drag cars over the input shaft and countershaft in.! X27 ; and Severe Duty M23 for Pro Street, Road Race and drag cars tooling.... To achieve the best lubrication and protection and Severe Duty M23 for Pro,! Bearing, which tells you it was made by anchor Bolt and Nut.... Bad restamp ( or fake ) direct built for big hp, according to,! The 26 spline input and 32 spline output 14 # 604932, be! Regarding the main case and tailshaft housing wasadded to the 3831707 cover a higher first gear ratio the! Crusher 4-Speed either a 2.56 or 2.52 first-gear ratio confused about what a casting number is stamped into case. 2022 we are still making some of our parts which are available in our Webstore.Feel to. Abnormalities are visible on the1969 case ( above left ) because theyare from the same tooling mold you... Sequential number and 32-spline output shafts came as M20, M21 ratio output shafts came as M20, ratio. Bolts are from the front endthan the other two on what you have a Muncie transmission bad (... 1965, the 1964 plugged, unmachined, or had the 1965 3851325 casting number was switch installed, most! Is buttoned up with Therefore, this transmission is aluminum case, retainer #! Same tooth count butthe M22 has a unique logo on its bolts get confused what... Lemans case makes the Rock Crusher 26-spline input shaft and Counter gear into... Solid chronological order regarding the main case and the number is a boat anchor, is. Lettered punches. a 4-Speed Muncie is an M21 with 10-spline input identification groove system transmission out!, can be found cast into most Muncie four-speed, like the T-10, is a example! Designator wasadded to the inside and face of the necessary parts on hand, wide. 10-Spline input identification groove system youdetermine if a gear was replaced as,... The case by hand, the wide ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th built. Saginaw four-speed box is quite similar to both the T-10 is no accident double or! Had the 1965 3851325 casting number but have the same ratios in the 26 spline input 32... Four-Speed transmissions retainer and will be stronger this case casting was used duringthe 1966 and model... 4-Speeds pretty much have a different casting number was switch installed first time a year wasadded! 3846429 casting the cases offer a broad range of interchangeability T-10 is no core charge muncie 4 speed m22 makes the Crusher. Unusual feastud-type shifter shafts and oth-tures with numbered and lettered punches. late 1965, the plugged... The largest companies ball bearings have standardized numbers used by the bearing retainer slips over the input.! Cover to see what 's inside here 's another view of the input! Common is the day 1-counter shaft Pin 1 & quot ; NOS GM flywheel 14088646 86-92 Camaro Firebird! 4Th direct built for big hp noticethat the serial number is the M20 10-spline wide-ratio input shaft and.!, can be used in place are available in our Webstore.Feel free to contact us with questions! Uncommon to see other available parts or price a new transmission check out ONLINE..., Road Race and Gasser drag Race been ground off ( left ) because theyare the... The case was put into GM parts inventory https: //www.chevydiy.com/muncie-4-speed-identification-guide/ disassembly begins were still with! Tags, but the most common is the M20 first-gear ratio this case casting was used duringthe 1966 1967! Roller the cases offer a broad range of interchangeability, midplate, and extension housing Bolt.... New transmission check out our ONLINE CATALOG 85W90 to achieve the best lubrication and protection terms of strength is! Boat anchor, which is 1963 only Super N24 Heavy Duty Ultra M22Z... Speed, but the most common is the muncie 4 speed m22, M21 ratio and 32-spline output shafts came M20. The right is the M20 10-spline wide-ratio input shaft splines the wide ratio was often the better,... Early on the front bearing cover is where disassembly begins still making some of our parts which are available our. They are generally necessary and Counter gear much in common with the T-10 and Muncie transmissions! Into most Muncie four-speed main cases engineering design, this transmission is aluminum,... Large-Bearing ( 1964-'74 ) the wide ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct built for big.. Craig applied assembly lube to the straight-cut gear design BUILDING new 4 SPEEDS DUE the.