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M21 muncie wiki. Muncie M21 Parts illustration - drivetrain.

  • M21 muncie wiki. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. Each transmission features top-quality components throughout, as well as premium seals and gaskets for a leak-free experience. Apr 8, 2011 · Dillon L. I know that the M20 came in cars with a standard rear axle ration ( 3. Muncie also had a second close-ratio transmission designated M22 and often referred to as the “ rock-crusher ,” which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after Ironically, the Muncie was designed based of of the T-10 using its same basic layout. My muncie is sitting on a shelf. The M20 is the "wide ratio" version which begins with a 2. 73, Vintage Air. 56:1 ratio is referred to as the M20. 11:1 or 4. 99 OR WITH Muncie CORE exchange $2399. 1968 Muncie transmission tag #3924706. Muncie 4-speeds were produced in two different ratios wide-ratio (M-20) and close-ratio (M-21). Aug 2, 2016 · Author Topic: 1969 Muncie M21 (Read 8716 times) wisemanz28. New Muncie M20 2. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 Apr 27, 2023 · 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). This was originally a four Mar 3, 2024 · Early stick shift trans are, Saginaw 3, or 4 speeds, which were made in the 70's, and are not strong. Muncie M21 Parts illustration - drivetrain. In city driving you will appreciate the M20's lower first gear. So, I would suspect you have the Chinese or Taiwanese M21 gearset, these gearsets will be noisy and whine. 10 12 bolt, Matching #'s Dec 28, 2010 · 1968 Camaro Coupe: Forged 383, AFR heads, Edelbrock Air-Gap intake, Holley 750 dp, Dynatech headers (557 HP/543 TQ), TKO-600, 12 Bolt 3. Muncie RPO Codes . I've seen the M20s run on big blocks and all kinds of high powered small blocks at the strip. com. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. I like to start with the case components first and then deal with the internals second, during inspection. M20 is a 2. $2799. The first gear of an M21 was 2. This was pulled from a 68 Chevelle 40 + years ago as best as I remember. 56. Available in several configurations to suit The Synchro-mesh 465 or SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991 at the factory in Muncie, Indiana; it was designed to replace the somewhat similar Muncie SM420 transmission, which had been in production since just after World War II. Nov 7, 2022 · The gear ratios are the main distinction between the Muncie M20 and Muncie M21. No way I'd try that in the car. Since it was mentioned it comes with an adapttor for a T18 I'm thinking its probably one of those. There also was a second, heavy-duty Muncie is just a manufacturer of transmissions for GM. From $157. 52 1st gear. Muncie also had a second close-ratio transmission coded M22 and known as the “rock crusher,” which was used behind performance big-block engines and in some Corvettes. Muncie has an aluminum case and Saginaw is cast iron. 52 Wide Ratio OR M21 2. 52:1 and a 4th gear ratio of 1. (M20) and the close-ratio (M21). 56:1 first gear. The parts that we replaced Nov 4, 2022 · 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. These are easy to adapt to a wide range of hot rods. If you are doing this for the first time, remember that there is a huge difference between a restoration and a plain rebuild. The 2. The difference in first gear in an m20 vs an m21 makes driving much better with the m20 which I changed to. Drivetrain catalog offering discounted General Motors M21 transmission parts, complete repair kits, major components and troubleshooting help including M21 Transmission illustrated parts drawing. MUNCIE 4-SPEED MANUAL TRANSMISSION ASSEMBLIES, GEARS & PARTS APPLICATIONS: GENERAL MOTORS 1963-1974 GENERAL MOTORS (HIGH PERFORMANCE) AUTO GEAR EQUIPMENT 530 State Fair Boulevard, Syracuse, New York 13204 (800) 634-3001, Inside New York: (315) 471-8141 Fax Numbers: (315) 471-8146 or (800) 537-4213 AUTO GEAR EQUIPMENT It is a good idea to understand the basics of your Muncie 4-speed before you start rebuilding the transmission. Although he is seen with a 1957 Corvette, which came with a T10 4-speed, the design of the T10 and Muncie share the same features. 56 ratio is commonly referred to as an M20. Your trusted source for quality Muncie Manual Transmissions and Parts. 1 ring on the 10 spline input shaft. Unless you have a torque monster go with the m20. The Muncie 4 Speed came in 3 basic models… the M-20, M-21 & M-22. Each transmission is disassembled, cleaned and inspected to ensure an outstanding final product. Sep 23, 2018 · The 2. The difference between a Muncie and a Borg-Warner is the Muncie’s 7-bolt side cover (two less than Borg-Warner units). For a comprehensive […] Jun 8, 2004 · 1968 RSSS BB 396/325 AC TH-400 Black/Red (Sold) 1969 Nova SS 350 M-20 Red/Black (Original) 1967 Chevelle SS (Clone)(Project) Sep 2, 2004 · Help Identify Muncie M20, M21 or M22 Jump to Latest 9K views 9 replies 7 participants last post by 67ss Sep 8, 2004 If you have a Muncie with a similar character after the date, can get a photograph of it and KNOW whether it's an M20, M21, or M22, please pass it along. Thanks! 1969 SS396, Lemans blue, M21, 4. 31 in my '67 ), while the M21 came in higher (numerical ) rear axle ratios. I already have a M21 Gasket kit so I'll be good to go with that procedure. Successfully diagnosing transmission problems is directly related to how well you understand how this transmission works. This Muncie has 27 splines and is side loaded has an Jul 5, 2016 · The Muncie four-speed transmission was used with many different models and engine combinations from 1963 through 1974. (the SM stands for Saginaw / Muncie). The m20 first gear is 2. There are three basic types of Muncies: M20, M21 and M22. Muncie M20 Wide Ratio or M21 Close Ratio Gear Set. The transmission came out of a 1969 Chevrolet Camaro. M21 was 2. But now I am actually looking at how it will drive or maybe IF it will drive. All 1963-65 M20 and M21 transmission used a 7/8″ countergear pin in all assemblies. Also found in wide and narrow ratio configurations. See full list on drivingline. 99!! Questions on our core exchange policy? CALL 1-877-614-4327  Shipping cost on the new unit is $150. Item #: MTGM016 May 20, 2008 · Synchromesh #12345349 is one of the fluids I do not like in a Muncie, unless you have an oil seal in your front bearing retainer. Oct 11, 2018 · Muncie M21 upgrades Jump to Latest 8K views 16 replies 11 participants last post by Chevymec Oct 14, 2018 Aug 31, 2016 · My Z28 came with an M21. Date stamped P8P27 for Muncie, September 27, 1967 and partial VIN of 18K116891. Need to check it out. What To Look For Serial Numbers: The serial number is often stamped on the case. The side cover has seven bolts and two shift cams. And even though it was a higher ratio than the 2. Santa Rosa, CA - 66 Chevelle, 454 bb Mark IV, 4 speed Muncie M21, 12 bolt posi Reactions: 427L88 and DUTCH MAX HEADWORK Save Share Muncie Indiana Transit System (MITS), ☏ +1-765-289-MITS (6487). 1969 - 1970 Camaro Muncie Four Speed Transmission, M-21 Complete original GM Muncie M-21 4-Speed Transmission for your Camaro. 56 first gear, and wider ratio for drag racing. I used my spare M20 while having the M21 rebuilt. Muncie SM319 transmission — 3-speed transmission physically identical to the Muncie SM318, with an added Borg Warner overdrive unit. Some of the best Muncie builders participate on that page. These M22 American Chevy Muncie Transmission Parts – M20, M21, & M22. The car weighted 3485. The M22 was a HEAVY DUTY (supposedly stronger) close ratio only. 91:1, which is more appropriate for street automobiles. ON SALE Muncie 4 Speed M21. Jan 25, 2022 · 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). I would think your transmission is very noisey using the synchromesh and low fluid Apr 22, 2011 · My M21 is in a cruiser nowhas about 15,000 on it since racing it. (updated Oct 2019)Bus service: 14 fixed route bus transportation within the Muncie city limits provide service to most shopping, medical, employment, residential, recreational, and governmental locations. Granted, this may take 20,000 miles to see the effect but, it does happen. If the M21 hadn't been original to the car, I would have left the M20 in. During prototype testing, this 7/8″ countergear pin was found to be the weak link in upgrading the Muncie transmission. A Muncie differs from a Saginaw transmission in that its reverse lever is in the tail housing, not the side cover. The Muncie M20 was a wide-ratio transmission and was intended for basic street drive-ability and basically for cruising your car . So, it is perfectly safe to use Max Gear in your Muncie transmission. 52 where the m21 is 2. Note: All Muncie 4 Speeds are Built To Order, Call Us With Your Application for Current Build Time and Delivery Date. From $419. The former is a wide-ratio gearbox with a gear set that has a 1st gear ratio of 2. 20 ratio is commonly designated as the M21 transmission, while the 2. Professionally rebuilt and guaranteed for 1 year. 20 low gear, closer ratio, for road racing. Fodrea was the GM engineer whose name is listed on the design patent for the Muncie. Aug 7, 2018 · GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Feb 16, 2014 · The Muncie M21 is a close-ratio unit originally designed to be matched with 4. Muncie cluster gear for 1963-65 (7/8" cluster pin) or 1966-74 (1" cluster pin) Muncie either M20 or M21. Jul 30, 2011 · There are more than a few differences between a Muncie 4 speed and a Saginaw 4 speed. 1968. 20 1st. The fluid capacity of a Muncie is 3 pints or 1-1/2 quarts. They both have the same ratios beginning with a 2. If you want to race or speed shift a transmission at 6000 RPMs, DON'T BUY A Muncie. MANUAL TRANSMISSION. The choice of transmission was dictated by the engine size and rear-axle ratio. Sep 23, 2018 · These 5 casting numbers identify all aluminum Muncie main cases: 3831704 – 1963 only 3851325- 1964-65 3885010- 1965-67 3925660- 1968-70 3925661- 1971-74 The 2. The main one is weight. Feel free to upload pictures and ask questions. This Tech Tip is From the Full Book, MUNCIE 4-SPEED TRANSMISSIONS: HOW TO REBUILD AND MODIFY. I found a shop that has a engine run stand and he also rebuilds trannies. 20. Sooooooo, Jul 9, 2017 · Identifying a Muncie 4-speed transmission can be crucial for both restoration projects and performance upgrades. Aug 3, 2018 · GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Sep 15, 2010 · There are several interesting features which are special in the 1965 M22. Remanufactured 4-speed manual transmissions are now available from OPGI. Everyone has a different approach to prioritizing inspection, repair, and assembly. 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). Aug 14, 2010 · Royal Purple Max Gear is a non-corrosive formulation (for yellow metal syncros) with extremely high load carrying capability. 199 1st gear heavy duty box) Jul 8, 1999 · The M21 is a standard Muncie 4 speed. This Tech […] Aug 1, 2014 · As Gary has mentioned, a properly built M21 or M20 Muncie should not have excessive gear whine like an M22 "rock crusher". [32] The forerunner to Ball State University also arrived at the turn of the twentieth Apr 22, 2024 · C1 & C2 Corvettes - Muncie M21 Trouble Shifting to 1st & Reverse - I just picked up a newly restored 1964 Convertible with the 365 hp 327 and the close ratio M21 with a Hurst Competition Plus shifter. 00 . Jun 16, 2024 · The M21 was a close ratio and it was more compatible with low geared rearends such as 3. M20 gearset also available in Italian . 20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM’s production codes. com Sep 23, 2018 · The 2. The M21 was for higher performance cars. Jul 14, 2009 · There was an article I found in one of the vette magazines that gave a pretty good step by step, but I wasnt clear if the trans was a T-10 or Muncie. Available in several configurations to suit Jan 2, 2012 · Our car is a factory M21 4. Sep 6, 2014 · The Muncie M21 is a close-ratio unit originally designed to be matched with 4. If you have no useable core the price is $2799. The research I had done was more about fit than anything else. 70, 4. Oct 7, 2008 · 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. Sep 26, 2000 · Most guys I know that insist on running a Muncie drag racing prefer the M20 to the M21 because of the lower first gear. 56:1 ratio is commonly referred to as the M20. 20:1 ratio is commonly designated as the Muncie M21 transmission. 11, 4. Home > Gear Units and Components > REMAN TRANSMISSION > 66-74 MUNCIE M21 4SPD 27 SPL 66-74 MUNCIE M21 4SPD 27 SPL. Also stamped PO3 26 with Vin 252093 on it. 20 ratio M21 4-speed. Launced at 4000 mostly on M/T ET Streets. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. This is how the Muncie countergear’s design evolved. 99. Apr 15, 2024 · Ok so I am trying a manual conversion on my 63 more doors and I got a really good deal on a 1968 m21 muncie 4 speed. For Muncie transmissions, you’ll typically find this on the driver’s side . Also explain why you don't like how your car drives on the highway now. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. 56:1 GM 4 Series differentials. 00 Aug 8, 2018 · We bolted on an ACT clutch, a PRW conversion flywheel (PN # 1634680), a big block Chevy cast iron bellhousing, the M21 Muncie, and American Powertrain's HYDRAMAX system. Oct 5, 2011 · The 'M-series' codes (M20, M21 and M22) are GM 'RPO' codes, like Z28 and WS6right down to the seatbelt retainers. Transmission, Manual, 1966-68 GM, Muncie M21, 2. For Street Applications they are perfect. A close-ratio gearbox keeps shift points closer together, which keeps rpms up. The center gear is from a BorgWarner T85 3-speed. 00 or less to anywhere in the lower 48 (call Transmission, Manual, 1969-70 GM, Muncie M21, 2. Muncie Cluster Gear M20 M21 FOR 1" or 7/8" cluster pin. Member; Posts: 239; 1969 Muncie M21 « on: August 02, 2016, 11:37:26 PM Aug 18, 2023 · Andy, I understand. Muncie SM318 transmission — 3-speed transmission used from 1954 through 1969 in both passenger car and truck applications. Feb 2, 2020 · After a bit of research here it appears I have a 1965 M21 Muncie with 3851325 case,3846429 tail housing and 3831707 side cover. See our selection of M20, M21, M22, and M23 4-Speed Muncie Transmissions for Sale here at RiversideGear. An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block high-performance models. Muncie (General Motors) 4-speed longitudinal transmissions were developed in three distinct models – The Muncie M20 wide ratio manual transmission, the Muncie M21 close ratio manual transmission and the Muncie M22 heavy-duty close ratio manual transmission. [14] [31] A new public library, which was a Carnegie library project, was dedicated on January 1, 1904, and served as the main branch of the city's public library system. Also, Muncie gears tend to be stronger. 10 gear car. 52 in the M20, it worked fine with low geared rears. Dec 4, 2006 · Muncie M21 leaks Jump to Latest 10K views 19 replies 6 participants last post by IanRiordan Dec 7, 2006 This video shows the process of rebuilding the Muncie 4-speed Transmission. It's just that little bit smoother on the take off. Reported to be M21 but cannot find tag number to verify. The first models had a 2. The hot rod guys kind of took it over to mean the close ratio M20 and M21 but they also made SM420's and SM 465's. Ratios of the M20, M21, M22. RPO M20 is wide-ratio 4spd; M21 is close-ratio 4spd; M22 was a specialty Heavy Duty close-ratio 4spd (I personally do not know if RPO M22 was used to designate anything other than the Muncie 2. Here’s a simple guide to help you accurately identify your Muncie transmission, especially for Chevrolet vehicles. The 302 does not make a lot of torque and there is a lot of hills in my area. 20 close ratio gear set. He told me if I'd bring the M21 he'd drop the housing and we'd count the teeth, no problem. Sep 15, 2021 · Below find a parts illustration for the Muncie M21 4 speed manual transmission used by General Motors between 1966 and 1974 in the following models: Pontiac Firebird, Catalina, Grand Prix, Lemans, Oldsmobile Cutlass, Jetstar, Cruiser, Chevrolet Camaro, Chevelle, El Camino Corvette and Nova. The large-bore Muncie came into production in 1964-’65 and became the standard from then on through the end of production in 1974. It is therefore suitable for use in applications (Muncie included) calling for a GL-4 or GL-5. Muncie M20, M21, and M22's, were all 4 speeds, made by Chevy in Muncie indiana, and were used behind small, and big block Chevies. Jun 13, 2017 · The Muncie four-speed transmission was heralded by many as an “indestructible” four speed used by General Motors, and found its way into many different car models, behind various engine combinations between 1963 and 1974. Mar 17, 2021 · The M21 & M22 is a four speed, RWD or 4WD transmission. The M21 had about 75 runs on it with 430 horse at the crank on motor and 513 at the crank on the juice. View the 1969 Muncie M21 Transmission for sale at Indy 2024 in Indianapolis, Indiana as Z579. com The Muncie Star was founded in 1899 and the Muncie Evening Press was founded in 1905. Autogear does not manufacture the Italian made M21 gearset. cwpbco lhpq rcyqx ixbm kqdukl fvnsrjye akmns qiydytk pzknz zpu