The data will help you to identify the transmission system. by three Numbers and ending in another Letter (or two). The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. With an old GM 4-speed manual, you have to observe the transmission system side profile. A typical Saginaw assembly date stamp would be S313 indicating Saginaw trans produced March 13. Clean the area thoroughly and use a nice bright different casting number, which is 10168588. The M-21 has a higher pitch angle on its gear teeth. All rights belong to the entity responsible for the trademark or copyright. - Casting numbers on the case, extention housing and side cover item 2 Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios. Cast iron case, believe it is a Saginaw three speed, but not sure. Show More Show Less. 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. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. Note the single groove, meaning an M21 close-ratio. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. Prior to 1967, transmission ID numbers contained the plant prefix code, month and date of production (expressed numerically) and a shift code (D = Day, N = Night). How To Identify Transmission By Vin - MicDot transmission identification confusion | Chevy Tri Five Forum a usually four digit letter/number combination separated like this: X XX X. Drivers dont usually have a problem with identifying modern manual 5-speed and 6-speed transmission systems. From complete engines, to torque converters to Monster in a Box, we've got all your HP needs covered. I don't think we can identify the tranny from that. How to identify and decode chevrolet manual transmissions. It'll be marked 375-THM on the bottom of the tailshaft housing. Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. The 1969 and later models use a bolt to secure the linkage to the transmission. The Saginaw reverse shift lever is on the cover, and the cover has 7 bolts. You can find the serial number on the bottom left of the transmission data plate. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. VIN decoders are helpful, and they come in handy when you need to know more about your vehicle. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". Unlike the Turbo 350, instead of a kick down cable, it uses an electrical slide switch, which is controlled by the throttle linkage. GM 3 Speed Manual Transmission 3854728 for sale online | eBay Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Remember, check for a nearly square shape and 13 bolts. Also, the chances of older cars having an intact manual are slim. saginaw serial numbers | NastyZ28.com V8 engines included 283 and 327. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. When you have the two side-by-side it becomes obvious which is which. . Tailshaft housings will vary based on original application. Supposing it shifts six times, its a 5-speed system. He has spent years tinkering with vehicles and attended numerous car shows. We want to make your transmission search as simple as possible. Main case casting numbers (when looking at the passenger side these numbers are upside down) 6273262, tail shaft housing casting numbers 3968035, Shifter cover casting numbers GM1 3952646. The Muncie four-speed transmission was heralded by many as anindestructible four speed used by General Motors, and found its way into many different car models, behind various engine combinations between 1963 and 1974. It is a cast iron case tranny with either a 2.85 first gear or a 2.54 first gear. The cases offer a broad range of interchangeability. Generally able to handle up to 400 foot pounds of torque. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. My question is will this direct swap to a '81 with the 3 speed saginaw? You need to look . When you find a used four speed, a Saginaw and Borg Warner transmission will likely be flash rusted because of the cast-iron construction. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. The transmission pan is one of the most precise methods of identifying a transmission. General Motors has several transmissions, and they can be challenging to identify. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. 3. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. In the early 90s, GM rebranded all of its transmissions. General Motors has variety when it comes to automatic transmissions, and some of them have different pan shapes. Muncies are the hot tip, since they usually were used with high performance engines. So it's definitely something you want. The "kick down" switch locations for the Turbo 400. Borg Warner once again started supplying four speeds to GM in the early 70s with the release of the Super T10. This machined flat area has serial numbers Dave loves music, design, tech, current events, and fitness. M38 Standard Turbo 350 manufactured from 1976 to 1981. On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side. 3925658 does not match any casting numbers in my books. Many enthusiasts mistakenly refer to all Muncies as Rock Crushers, and this is just not appropriate. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. CD-68-315953 We are dedicated to giving you the technical support you need, when you need it! Part of the problem with GM 4-speed systems is that theres a lot of variety. Enjoy the forum? Cases are either small-bearing (1963) or large-bearing (1964-'74). style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. Post-67 Example: P9E03 - (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month), Month code: (NOTICE this is NOT in alphabetic order) (AODE & 4R70W). Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. The materials used in case construction of a Muncie/Chevy four-speed mean that if you find one of these gear boxes in a shed or barn, the Muncie will probably be smooth and covered in grease and/or oil, while a Borg Warner or Saginaw transmission will usually be coated in a light layer of rust. THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992. fileslib. You can find the exact transmission you have. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. S = Saginaw 3-speed A = 68/69 L6 Torque-Drive K = McKinnon 3-speed C = Cleveland Powerglide . However, neither compares to the Muncie in terms of strength. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. According to Koval, the easiest way to identify an automatic transmission, though, is by transmission pan shape. Powered by, Badges | be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") 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. See partial VIN stamped on housing as well as the date code on the fluid pan. Outside that, you can push in your clutch and hold the brake. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. 4. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. Prior to 1967, transmission ID numbers contained the plant prefix code, month and date of production (expressed numerically), and a shift code (D = Day, N = Night). You can check online auto repair websites, as some have free decoders. Some exceptions include the 1970 with either the SS396 or SS454, the 1971 and 1972 SS with the 454 engine where the H.D. THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. Yes, there is a serial number on a transmission. 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. You can also use VIN decoders to identify your transmission. theYear=now.getYear() In order to correctly identify a Muncie four-speed transmission, several visual clues are needed, and those cues involve the casting numbers on the case, side cover, and tailshaft. THM400 - The THM400 was GM's Heavy-duty 3-speed transmission used from 1964 to 1990. hey Bob .I wish I could help out with your numbers on the trannys. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. Joined: Dec 2, 2001 Messages: 26 Location: Midwest City USA. Manual Trans Reference GM 3, 4, 5 and 6 speeds V24 How to identify chevrolet gmc manual transmissions Use the following information to compare physical description of your Chevrolet or GMC manual transmission in order to identify what model transmission is in your vehicle. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. 3L80 stands for three gears, longitudinal mount (rear-wheel drive), and the 80 signifies that it can handle 8,000 lbs. Discussion in '1947-1954' started by Blueflame236, Dec 15, 2012. . GM Power Glide 2 Speed Transmission. Serif is a seasoned automotive enthusiast with a passion for cars. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. Sep 20, 2004 #4 CRAZYREDNECK77 Member Sep 20, 2004 67 How To Identify Chevy Four-Speed Transmissions Thanks Dec 11, 2012 #2 G Gary S Administrator Lifetime Gold Member Apr 14, 1999 24,823 The Turbo 375 was a version of the transmission used from 1972 through 1976, in small displacement cars. Basically, if you are installing one or the other in a car that will be a nice driver and see only minimal, spirited gear grabbing, both the Saginaw and the Borg-Warner can be a good and less expensive alternative to the more robust Muncie. . 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). The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. General Motors is an innovator in the automobile industry, and they were one of the early adopters of the automated transmission system. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the "bigger cars" there are no cooling holes. Looks to be from a 68/9 camaro. Chevy also had a Muncie 3 speed that year, but the side cover casting on that one should be 3952646. 13. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Turbo 400 transmissions were partial VIN stamped either above the pan rail on the drivers side (very difficult to see with the exhaust system installed) or on the drivers side of the bell housing as indicated in the picture. Awfully close to a Muncie (3925660). Further Muncie identification The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. From left to right are the three basic Muncie input shaft/countershaft combinations. Transmissions - Tripod Never underestimate the mighty post-war Powerglide. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA. The 4L80E would be the "electronic" model. GM Turbo 200 and 200C: 3 Speed Transmission. In modern cars, you can quickly identify the 6-speed and 5-speed transmission applications. I live in Covington, Tennessee and I just had my Monster Transmission installed in my 2001 Dodge Ram and I'm completely happy with it. document.write(theYear) The one on the right is an aluminum-case Powerglide. The 1963-'65 M20 input shaft will not have grooves. GM Turbo 400 TH400 Transmission 3 Speed Transmission. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox. That being said, there was a second, close-ratio version (M22) that was developed to survive duty behind engines with a higher torque output, and was known as the Rock Crusher. This version was offered in high-performance big-block cars starting with the 1965 Corvette. Muncie Transmission Identification - 1968ss.com 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. For example, the first X will be a Letter from A through L. my Saginaw #'s . As a rule of thumb, the Saginaw and Borg Warner Chevy four-speed transmissions should live a long and happy life when used in cruiser applications. makes this job easier. 2023 Power Automedia. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. The length of the unit can also tell you a few things. Number is located on side cover. This is when you have to remove the side cover to see what's inside. Here's a typical Muncie gearset consisting of First, Second, and Third gear. The source serial number contains additional information such as model year, division identification number, manufacturing plant, and production sequence. The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. box FWIW. Transmissions with a suffix of "C" on the end of the type (THM200C) indicate the transmission has a lock up torque converter. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. He digs all flavors of automobiles, from classic cars to modern EVs. 14" X 6" Rally 1 wheels were featured as an option on the 1966 GTO along with the standard 14" X 6" stamped steel .
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