Muncie 4 speed identification codes

00. Milder GM cars used Saginaw or Borg-Warner four-speeds. Application Codes . P7M08 (August 8, 1966) date stamping. The extension housing code is usually within a few inches of the casting number also on the passenger side. Does anyone know how to decode a metal tag bolted to the side cover of a muncie 4 speed? I know it is a m21 from a 70 nova but would like to know if the metal tag contains any more information. The RICHMOND Super T-10 is a four speed countershaft helical gear transmission synchronized in all forward gears. "O" denoted the transmission was equipped with overdrive. Here are the engine block casting numbers used for small blocks and big blocks. Also, look for a single letter code of " F " below the brake line clip, The code on the Muncie P0305 is the date code (P=Muncie 4 speed, 0305 = March 5th) If the code were P0305N it would indicate the transmission would have been built on the night shift. We have put together a collection of photographs and descriptions to help you identify parts for your Pontiac. We also offer Transmission Rebuild Service and Case Repair. The large-bore Muncie 4-speed transmissions had the VIN stamped next to the transmission code or on top of the transmission. If you don't see what you need call us! Chevy Clutch Housings. 75" or 14") or number of teeth is more accurate because some 168 tooth flywheels are drilled with multiple bolt patterns, and the aftermarket makes a 153 tooth flywheel that a 11" clutch and pressure plate will fit. ) For your information, a few Muncie 465 casting numbers include: 25 Apr 2019 3 GM transmissions, including Muncie M20, M21, M22; 4 Automatic transmissions 4. I am refurbishing the car and am trying to identify and understand everything I have in the car. FOR MUNCIE CASING IDENTIFICATION NUMBERS Click here New Ultra Light 2 speed cluster gear < Click here, $270. P7H21 (June 21) date stamping. The tranmission is from a 1964 fleetside truck with an original 292 inline six, and is a 4-speed manual. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963 through 1974. Buy Muncie Transmission Drive Speedometer Gear 8 Tooth 1. To quickly finger what you have, notice in the above picture: An easier solution would be to find one of the more standardized 2. 95 . 2 4-speed identification; 4. The final incarnation of the muncie lasted until 1973 when the transmission was taken out of service. Successfully diagnosing transmission problems is directly related to how well you understand how this transmission works. Introduction to Rebuilding GM/Muncie 4-Speed Transmissions Includes in-depth instruction and photos. Heavy The one on the left looks like a 1958-64 Chevy Muncie OD. . The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. Muncie 4 speed spline, groove and tooth count characteristics. On maincases, the code is usually found on the passenger side of the case below the casting number. (example: P8R23 is assembled Oct 23, 1967 for 1968 model year. On maincases, the code is usually found on the passenger  3 Aug 2018 It was a matter of economics when Chevrolet needed a four-speed manual . Most people define Chevrolet Bellhousings by the Clutch size (i. 52:1 or 2. Muncie Heavy Duty Competition Overhaul kit 66-74. Muncie Overhaul Kit 1966-74. This worn out Muncie synchro hub is of a type used from 1966-1974. Serial numbers for Muncie 4 speeds always begin with the letter "P". The casting date 1965 and up Muncie 4-speed code location. MUNCIE M-20/M-21 EARLY, G. By John Gunnell. The Muncie design has roots going back to 1935. The following vehicles are likely sources of a Muncie four-speed. chevy 4 speed rock crusher manual transmission codes Liming heavy industry is specialized in the design, manufacture and supply of crushing equipment used in mining industry. No Price Muncie Master Overhaul Kit. 42 first gear ratio 1969 Muncie 4-speed only: A = M20 B = M21 Use of the Muncie type suffix C = M22 began with 21 Oct 68 production. More info on performance mods, clutches and shifters. 1958-64, M11, Early Muncie Light-Duty, 1964-71, M20, Muncie Wide Ratio (1st UPC = GM Universal Product Code. Information on transmission codes and VIN stamps is located on the drivetrain Service Engine and Transmission Identification; Transmission Trivia; ID'ing The wide-ratio Muncie 4-speed transmission was marketed under RPO M20. (A, B, C,) Last digit of assembly code. They were used in many muscle cars and Corvettes. e. Examples: R7S21 Saginaw 4-speed, Nov 21, 1966 P8R01 Muncie M2x 4-speed, Oct 01, 1967 P9T11B Muncie M21 4-speed, Dec 11, 1968 C9D14N PowerGlide M35 2-speed auto, Apr 14, 1969, night shift Saginaw transmissions featured application codes on the passenger side of the case near the rear cover. the automotive powertrain industries migrated to more splines on shafts due to their ease (speed , cost, etc. Muncie 4-Speed - 1968 through mid-1974: Stamped vertically on the right side of the case at lower rear, just ahead of the transmission extension. The next piece of documentation was the factory car order which was sent to Gorries Chevrolet to state how the car was to be built and that it was now awaiting production. Transmission identification codes can provide positive identification of a transmission. Tranny info, dimensions, ratios, Muncie decoding, automatic and manual. I have heard these tags make for quick id of the transmission. The large-bore Muncie came into production in 1964-’65 and became the standard from then on through the end of production in 1974. Muncie Date Coding Many Muncie 4-speed maincases, extension housings, and sidecovers have a casting date code. Early Muncie side covers had a stud and the shift arm attached with a nut on the stud while the 1969 and later model side covers had a hole and the shift arms attached with a bolt. The letter O would add confusion since it resembles zero. Some Muncies also carry ratio I. To ensure the continued well-being of your Chrysler 4-speed, let General Motors is an innovator of automatic transmissions, introducing the Hydra -Matic in 1940 1991–2001 4L30-E — 4-speed light-duty (used in BMW, Cadillac, Isuzu, and Opel cars); 1992– 4L60-E/4L65-E by Getrag · Muncie M20 — 4-speed longitudinal wide ratio manual transmission made by GM at their Muncie,  Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers,  Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. Not for passenger car as some self proclaimed specialists may think. mr. The Muncie four-speed transmission was used with many different models and engine combinations from 1963 through 1974. I am having a very hard time identifying my Muncie transmission-to determine if it is a M20, M21, or M22. The 84 4 speed case has brackets for cables used in FWD cars cast in to it's case. Complete overhaul kit for Muncie 4 speed transmissions, 1966-1974. 000) - Casting Numbers. If you would like to read more about decoding a 1960’s transmission, this page is pretty good. 5. . Transmission Identification. P stands for Muncie Plant. Some Muncies have been observed stamped in both locations, or with multiple stamps in either location. Muncie 4-speed Transmission (Group 4. Four Speed Transmission- Exploded View  31 Jul 2015 The Muncie 4-speeds (M20, M21, and M22) are some of the most popular manual Product Code: SA278 Most important, it shows how to completely disassemble the gearbox, identify wear and damage, select the best  Muncie 4-Speed - 1968 through mid 1974: Stamped vertically on the right side code painted on the left side of the case below the side cover to identify the low  The Magical Muncie 4-Speed Transmission. General Motors Transmission RPO Codes RPO Code Transmission Name Auto or Manual? # of Forward Gears M08 Borg Warner- 4 Speed Manual 4 M13 4T60-E Auto 4 M15 4T65-E Auto 4 M17 Muncie- 4 Speed Manual 4 M20 Muncie- 4 Speed Manual 4 M21 Muncie- 4 Speed Manual 4 M22 Muncie- 4 Speed Manual 4 M26 Introduction to Rebuilding GM/Muncie 4-Speed Transmissions Includes in-depth instruction and photos. Keep checking my blog for all sorts of tips, how to's, just all types of Chevy information. 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). 4 Speed Muncie Manual When I bought my 37 pickup I was told it had a Saginaw 4 speed. All 67-74 Muncies carry a producion code number stamped vertically on right side of case beginning with "P". The assembly date of this Corvette places it in the third week of June. One of the best ways to identify a Muncie is the casting numbers on the  Muncie Transmission information. D. Some Muncie parts are very valuable to Corvette collectors, so check each one’s rarity before putting one on your hot rod. Saginaw transmissions featured application codes on the passenger side of the case near the rear cover. I snapped some pics of the numbers on the side of the Tranny and I'm thinking now I have a Muncie 4 speed after looking up the casting number. It was a stout 4 speed transmission that All SM420 transmissions have casting numbers located on the driver side of the  Results 49 - 64 of 81 T10 4-speeds, SR4 4-speeds, T50 5-speeds, and T4 and T5 Here are all the numbers and such that I could find on the tranny. The O ring at one of the shifter forks is leaking so I was looking up a rebuild kit. 1964 to 1968 Muncie 4-speed transmissions can be identified from later models by the way the transmission arms attach. Muncie transmissions are known for both high-performance and heavy-duty applications, with three different variations available: the M20, M21 and M22. his numbers matching case and tailhousing, this kit includes. The large cast iron case with large bulge on the passenger sidemakes it easy to identify. The Muncie 4 speed,was first designed in 1963,and lasted until 1974. Muncie 4 Speed rock crusher, Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casing numbers, transmission, interior codes, and paint codes. 3-Speed - 1968-1969: Stamping located on the machined surface on the left side of case, just below and rear of cover. The code, located above the transmission cover, reads: C174 GM 3837334 Now using the "car and parts catalog of chevy truck id numbers '46-'72" the letter 'C' means powerglide build in cleveland, obviously not correct. 10. Diagram shows the parts and basic workings of a GM Muncie 4-speed. M. Examples: R7S21 Saginaw 4-speed, Nov 21, 1966 P8R01 Muncie M2x 4-speed, Oct 01, 1967 P9T11B Muncie M21 4-speed, Dec 11, 1968 C9D14N PowerGlide M35 2-speed auto, Apr 14, 1969, night shift . A Borg-Warner 3-speed was also used in the "mid" 60's in some GM cars; it has a curved bottom side cover, they are rare also. The product range of our company comprises mobile crushing plant, jaw crusher, cone crusher, impact crusher, milling equipment, ball mill, vibrating feeders, screens and The car is an original 4 speed 2+2 convertible with Mariner turquoise exterior and parchment interior. 3 Ford The date code format varied, but one commonly used format has a  or write for quotes. 26 Apr 2013 Hello all, I am looking to buy a Muncie M20 for my 1969 GTO and I have a few questions. Saginaw models should have the code stamped on the plate located next to the rear cover, on the lower right side of the case. 18 ID, 1. Muncie 4-speed Identification To distinguish between Muncie types, if the Muncie was built after 21-Oct-1968, the transmission code contains one of three letters at the end of the build code: GM Transmission RPO Codes start with the letter M. P7C09 (March 9) date stamping on a 1967 Muncie 4-speed transmission. With original Borg-Warner and Muncie four-speed transmissions becoming scarcer as time passes, GM enthusiasts are looking for other inexpensive four-speed transmission alternatives that can be easier to find without breaking the bank. It has power steering, power brakes, 4 speed, a/c, tilt column, bucket seats, console, wood wheel, power windows and 8 lug wheels. Probably has a rear mount pad on the bottom. Pre ‘69 Muncie’s use a stud & nut at the indicated attachement point, while ‘69 and later Muncie’s use a bolt as Muncie Manuals. 1 3-speed identification; 4. Saginaw 4 speed identification- figuring out the gearing. This group was designed for the Muncie & Borg Warner T10 4 Speed and GM manual C3 Corvette Transmission Identification Codes Transmission Production Code Locations 3-Speed - 1968 and 1969: Stamping located on the machined surface on the left side of the case, just below and rear of cover. I have a Muncie 4-speed with an inline Hurst shifter that has been in my 1978 Camaro Z-28 since I bought the car in 1994. Flywheel Diameter (12. 1967 was the first year to have the year stamped in the date code and the month represented by a letter code. Go here for info on Chevy Automatic Transmission Identification. You may click the image to see it full size or print it to keep as a shop reference. You must find the date code at the back LH side of the block first. Identifying Muncie 4-Speeds The tail shaft as  Pontiac first offered a 4-speed in 1960. Any transmission can expire, but Chrysler’s A-833 4-speed is much less likely to do so than others. Muncie 4-Speed . If it starts with an M you are looking at a Muncie, and if starts with an S you are looking at the 3 speed Saginaw. First and Catalog Pages & Part Numbers. I have looked all through my assembly maunal and differnt places. MUNCIE DATE CODING. On maincases the code is usually found on the passenger side of the case below the casting number. Here is an exploded view of the 4 speed muncie. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can How to identify and decode chevrolet manual transmissions. These words are very similar for the M20 and T10 but with some slight ratio differences depending on model. Chevrolet Muncie Transmission Parts - M20, M21, & M22. A couple good LH side photos would really help. 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. 1969 Muncie 3-speed B = 2. Below you will find Date coding information to determing the exact parameters of your transmission. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2399. 000) - Casting Numbers The M22 was produced in 1973 and 1974 for other GM divisions. side cover used from 1963- 68 * MUNCIE Shaft Identification The above Muncie 4 speed  16 Feb 2018 So for many years “4 speed Muncie” was a big selling point in the automotive Regarding strength, I have never seen official numbers but it's kind of . The person who A 1969 M20 should have the following casting numbers: Main case- . 76 OD 3708145 - Shop for all your M20 M21 M22 Muncie 4 Speed Transmission Parts at Wholesale Pricing! The Magical Muncie 4-Speed Transmission. 64:1 and limited Gm 4 Speed Manual Transmission Identification Numbers Muncie 4-speed Transmission (Group 4. The close ratio gear box,gives you a fairly high first gear,with the rest of the gears fairly close together,for less rpm drop on your top end. There are 2 basic ratios,close and wide. 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. side is is 3088336, my question is m-20, m-21, and what years availab Muncie 4 Speed Transmission We carry a large selection of Muncie 4 Speed Transmission Parts, Complete Muncie Transmission Units, and Cases. If you are like many four-on-the-floor muscle car owners you will tend to overlook replacing the gear oil in your Muncie (M20, M21, or M22), Borg-Warner Super T-10, or Super T-10 4-speed transmission. Passenger's  The transmission was the Sm420. Muncie four-speed manual transmissions came in many GM models of the '60s and '70s. And you’re right, Zack, not too many people actually know how to Serial numbers for Muncie 4 speeds always begin with the letter "P". I found a tag that was bolted to the side of the case of my transmission, which is 3924705. The cables run over the top side by side. Muncie 4-Speed Identification Guide It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. On this document the 4 speed transmission option code listed the transmission as an M20. In 1965, all 4 speeds were ordered initially by the M20 4 speed designation. 1969-1973 Typical date code: P9B08C P-muncie 9-1969 B-February 08-Eighth day C-M22 MODEL IDENTIFICATION(1969-1972) A-M20 B-M21 C-M22 Note: not always stamped Originally, identifying the transmissions by external markings was simple. An example would be the date code P8T13, meaning 1968 (8), December (T), 13th. The ultimate Master rebuild kit for Muncie transmissions. A Muncie transmission differs from a Saginaw transmission in that its reverse lever is in the tail * Engine Block Casting by Year/2- and 4-bolt Main ID * Engine Block Stamping ID/Date/CE (Chevrolet Engine) Information * Engine Suffix Codes (V8) - Chevelle specific - 1964 through 1972 by year * Engine Suffix Codes (V8) - All Chevrolet - 1955 through 1975 by code * Exhaust Manifold Casting Numbers/Dates * Holley Carburetor Numbers/Dates Muncie 4 Speed & GM Manual Transmissions Buy Sell Trade has 9,677 members. Here are the codes. In 1967 and 1968, the date code got a year designator and a letter designator for the month such as P8A01, meaning 1968 (8), January (A) 1st (01). 356 RETAINER 360806 74-79 (2nd Design) 604932 63 and 3SP 207 bearing 3741458 Cast (3741458) History: 3851326 use 3915020 06-67 3851326 1964-67 3859032 75-79 (1st De Transmission Production Code Locations. Here go's, casting number on the pass. The transmission codes are found on the Protect-O-Plate and in the following locations: Muncie 3-speed = on the boss above the filler plug Muncie 4-speed = on the right side of the case at the right side of the cover flange Saginaw 3- and 4-speed = on the lower right side of the case next to the rear cover First Generation Firebird (1967, 1968, 1969) distributor, and head casting identification codes and information in this section. Forward Gears Chevy Clutch Housings. Note that a Muncie dated with a September to December build date was actually built the prior calendar year. Muncie (left) Saginaw (center) Borg Warner (right). 20:1 Muncie four-speeds that were used from 1966-’74. From $114. But cant find what this tag even means. One more way to identify the Muncie is via stamped codes in the  13 Jun 2017 While casting numbers are a definite guideline for identification, a quick, somewhat accurate way to quickly identify Muncie transmissions  5 Jul 2016 I guess I am looking for a Muncie transmission guide for dummies. Of the regular production codes, one particular Muncie 4-speed type appears. The Saginaw however, came out in 66, and has a 7-bolt, flat bottom, side cover (both 3 and 4 speeds). Firebird cheap craigslist 4 speed swap, junkyard overdrive for pennies in a muscle car - Duration: 5:45. The product range of our company comprises mobile crushing plant, jaw crusher, cone crusher, impact crusher, milling equipment, ball mill, vibrating feeders, screens and Muncie 4 Speed Transmission We carry a large selection of Muncie 4 Speed Transmission Parts, Complete Muncie Transmission Units, and Cases. The cables are held in this bracket and use two spring metal clips in the shape of a “U” to hold them in place. The Muncie 4 speed. If you checked off the 4 spd option on the regular Order Form and listed the 3. This is a muncie transmission in my 68 chevelle l79. An "R" identified the Saginaw four-speed transmission built from 1964 to 1979. "S" identified the three-speed transmission as manufactured in Saginaw, Michigan, from 1962 to 1979. Casting numbers on the case, extension housing and side cover (on manual trans). Main Case Casting 3925660ID Tag 3924703, De-Codes to a 68 L35 396 325HP M20, 1 Cluster Gear PinPassenger Side SpeedoDate Code P8E20, P Muncie, 8 Model Year, E 20 May, 20th Correct for a late 68 GM Car10 Spline, Two Grove Input, 256 1st GearOutput 27 SplinePartial Vin 18K217420,Hurst Comp Plus Shifter and Linkage A Pontiac Four Transmission Identification. This is something you need to identify when you go to select your driven  RICHMOND's “Bullet Proof” transmissions are packed with power and speed. Invincible Extremes Muscle Cars Garage 19,701 views Muncie M-20 Wide Ratio 4 Speed Trans, New Bearings, Gaskets, Seals, and Synchros. Also covers how to disassemble and rebuild any manual transmission. The T-56 six speed manual transmission has been used in a wide range of vehicles from 1 Applications, 2 Features, 3 Identification, 4 See also, Muncie. It has a 428 YH motor which I do not believe is the original code to the car, though the date is 1967 model year. 5",11", or 12"). T-350 Transmission codes: Return home: Saginaw 4 speed ratio identification. Heavy D & L Transmission Parts Catalog Muncie Please Call for additional pricing information or to order 1-631-351-4837 Click on underlined part name for picture (More to Come) GM Manual Transmissions Muncie M21/M22 (Also M20 and BW T-10) Gear Vendors owes a lot to the Muncie close ratio trans. The Saginaw four-speed fits that role nicely, and the additional C3 Corvette Transmission Identification Codes Transmission Production Code Locations 3-Speed - 1968 and 1969: Stamping located on the machined surface on the left side of the case, just below and rear of cover. manual tranny id. 76 OD 3708145 - Shop for all your M20 M21 M22 Muncie 4 Speed Transmission Parts at Wholesale Pricing! The Chrysler 4-speed was introduced during the fall of 1963 for the introduction of the 1964 models, and has since been produced in several different versions with various updates and modifications. I’m not a big restoration guy. There was a MUNCIE 3-speed used in 69-70 in some GM cars, but they are rare. For example, the codes used for Chevrolet cars began with "R" for Saginaw four-speed types and "S" for three-speed models. Many Muncie 4-speed maincases, extension housings, and sidecovers have a casting date code. Most transmissions since 1962 will also have a CON VIN (concealed or confidential VIN, partial VIN, or VIN. Note the double-strike date code. 00 . When surgery is required, however, it is helpful to know the patient, its problems, and which internal organs can be transplanted. VIN indicates it was from a Corvette Transmission Identification. The other one looks like a 1965-up Saginaw, 3 or 4 speed depending on number of levers. The 27-spline tail shaft housing. You can click the thumbnail image next to each description to see an enlarged view. The Novak Guide to the GM Muncie SM465 Transmission. Too short for 55-6-7. Muncie Transmission Casting Numbers - Muncie Casting Numbers Front Bearing Retainer 4. The A-833 operates basically the same regardless of model or application. Reliable sources to validate information regarding serial and casting numbers will get scarcer as time passes. 1963-67 DECALS, LABELS, INSTRUCTIONS & TAGS Transmission Identification Tag Transmission Identification Tag TAG - #3831703, Muncie 4 speed, 250-300hp, after #12000: When I bought my 37 pickup I was told it had a Saginaw 4 speed. Only has 2 pieces to it’s case so it does NOT have an end cap. (451) 7 bolt side cover used from 1963-68 * MUNCIE Shaft Identification The above Muncie 4 speed transmissions can be distinguished from the style of the transmission arm attachment. New Light  2 Mar 2015 Serial numbers for Muncie 4-speeds always begin with the letter “P,” which to identify 4-speed transmissions assembled in the Muncie plant). All M21/22 have the same 22% upshift and 28% downshift spread as the Gear Vendors. Borg/Warner Super T10 4-Speed M20 The Borg/Warner 4-speed is a low wide-ratio manual transmission with a first gear ratio of 2. Kit includes: From $283. 9 May 2000 Transmission identification may be determined by finding the Muncie 4-speed = on the right side of the case at the right side of the cover  We carry the complete line of Muncie 4 speed parts,the highest quality parts,at the very best Muncie 4 speed Transmission parts,Gears,Bearing kits,Synchro rings and more! . If you don't see what you need call us! P7C09 (March 9) date stamping on a 1967 Muncie 4-speed transmission. Hi girls and guys, Flandy here with a request for help, regarding the trans in my 68. Muncie 4-Speed: The Complete History To understand the evolution of the Muncie 4-speed you have to look at a series of engineering platforms that led to the final design of this transmission. The basic design and operation theory of the gearbox changed little during this period, however several design upgrades and modifications were made during the total production run. The product range of our company comprises mobile crushing plant, jaw crusher, cone crusher, impact crusher, milling equipment, ball mill, vibrating feeders, screens and Muncie 4 Speed rock crusher, Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casing numbers, transmission, interior codes, and paint codes. Identification begins by visually identifying the units as Saginaw, Muncie or Borg Warner models and then by differentiating the three Muncie units visually and by decoding the serial number. Different   Identifying Muncie 4 Speeds II by Paul Cangialosi Third are date codes and VIN numbers that help confirm that the above case and gears belong together. intake manifold casting numbers, transmission, interior codes, and paint codes. D & L Transmission Parts Catalog Muncie Please Call for additional pricing information or to order 1-631-351-4837 Click on underlined part name for picture (More to Come) (taken from Muncie 4-Speed Transmissions: How to Rebuild and Modify) It is a good idea to understand the basics of your Muncie 4-speed before you start rebuilding the transmission. A properly set up M-22 Rock Crusher transmits up to 700 hp, so this stout transmission is a wise choice for high-performance applications as well as authenticity. The letter is the month, . (example: P7A14- Muncie 1967, Jan 14) Muncies assembly codes are model year. This 4-speed was assembled at the Muncie plant June 1, 1978. The SM420 is the older heavy duty, granny, 4 speed transmission used in Chevy and GM trucks. The regular productions codes identify an M-20, M-21, and M-22. Muncie Transmission ID and Ratio Guide Muncies assembly codes are model year. The code has nine symbols that will reveal the GM division, year, model, assembly plant and car who rebuilds " Big 3" four-speed transmissions and who can help you identify what you've got. bowtie Hi everyone I am one of those car guys that cant just get enough, I pretty much live and breath cars. After 1974, GM went back to Borg-Warner for a performance four-speed transmission with the release of its Super T-10. It is an excellent 4 speed to swap into a Jeep with a Chevy or Buick engine. 90 axle on the All Series Special Equipment Order Form, Pontiac selected and installed the code 9 trans (the only difference between it and the code W is the internal speedo gear and neither will have the groove ring because both were wide ratio). muncie 4 speed identification codes

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