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On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. Once you identify the pan, count the number of pan bolts for confirmation. (700R4 & 4L60) You can identify transmission numbers by checking on the transmission pan. However, finding one of these transmissions now at a swap meet or salvage yard is getting harder and harder. Chevy also had a Muncie 3 speed that year, but the side cover casting on that one should be 3952646. This is usually a 7 digit number and each letter/number is about 1/2" tall. Keep in mind, if you plan to drop one in a vehicle that makes more power than it did when it was stock, you might want to consider going with the Muncie if you plan to beat on it. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 . 5. WE ARE READY TO SUPPORT YOUMon - Fri 9:00am - 6:00pm EST. The SM465 was made by General Motors from 1968 to 1991. The Muncie utilized seven different input shafts. Transmissions - Tripod THM200 - Light duty, "metric" 3 speed transmission. The transmission codes are found on the Protect-O-Plate and in the following locations: . If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. It is a cast iron case tranny with either a 2.85 first gear or a 2.54 first gear. Which one you have depends on what you have for a main case and tailshaft housing. We will safeguard your e-mail and only send content you request. Numbers are displayed below, as they appear on the transmissions. As a manufacturer, GM also applied numerous transmission systems in their older models. Please click Accept Cookies to continue to use the site. Many GM trannys had the VIN stamped on the maincase on the flange where it attaches to the tailshaft, but some of the later Saginaws had a pad machined into the case just for stamping the number. The A = January through L = December. 20. GM 8. 1993 and Newer (4L60E), 1980-1991 (AOD) Input has 3 rings so it should have the 3.50 first gear. Muncie Transmission Identification - 1968ss.com 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 easiest method of GM automatic transmission identification is to examine the transmission pan. It's worth the price of membership! 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. When introduced in upper-level Chevrolet models in 1950, the Powerglide represented the first automatic transmission offered by the Big Three. 14" X 6" Rally 1 wheels were featured as an option on the 1966 GTO along with the standard 14" X 6" stamped steel . Now, lets explore GM transmission identification, the different methods, and more. Aavailable in a 3 speed auto or 4 speed manual transmission. 3-speed from 1966 SS396. Serif is a seasoned automotive enthusiast with a passion for cars. be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") It is easy to determine whether you have an early or later model Muncie four-speed transmission by the way the transmissions linkage arms are attached. Did you know that there are various models that were used in various cars? 3L80 stands for three gears, longitudinal mount (rear-wheel drive), and the 80 signifies that it can handle 8,000 lbs. They used -E to distinguish the electro Hydra-Matic transmission from other non-electronic ones. How to identify and decode chevrolet manual transmissions. Making this separation makes the job easier. Author: Alan L. Colvin. This includes but is not limited to Ford, Chevrolet, General Motors, Dodge, Mopar, or any other trademarked or copywritten content. hey Bob .I wish I could help out with your numbers on the trannys. 3 Muncie 4 speeds were offered. GM 3 Speed Manual Transmission 3854728 for sale online | eBay The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. 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. Like I said, the Muncie HD is a lot heavier. What's the Deal with the 3-speed Manual Transmission? Use the shifter to shift gears and note the number of times it shifts. - Casting numbers on the case, extention housing and side cover The early GM Hydra-Matic transmission served the 1940-1968 Oldsmobile models. Not only is the diagram below helpful for identification purposes, but is a great visual source to see if you have enough room for a swap you might be contemplating. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. If you dont know where to check, the transmission usually stays around the area of the rear tires. 16. Basically, GM stamped them anywhere they could find a suitable place in the casting. Post-67 Example: P9E03 - (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month), Month code: (NOTICE this is NOT in alphabetic order) The M-22 is distinguished from an M-21 by 1. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. Need help to decode Saginaw 4 speed transmission This can add confusion to what you've found. On the far right is the M22 26-spline input shaft. Most transmissions will have a "source serial number" (chassis vin) usually found close to the transmission code. 7. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. How To Identify Chevy Four-Speed Transmissions For example, replacing a Powerglide with a Turbo 350 is an easy swap. Terms of Service. When you find a used four speed, a Saginaw and Borg Warner transmission will likely be flash rusted because of the cast-iron construction. But in non-performance applications, they were still a good Chevy four-speed transmission. 691747 OR 591747. GM 3 speed ID | Page 2 | The H.A.M.B. And keep in mind that not all will sport these grooves. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Powered by, Badges | Expert advice on car parts, maintenance, and repair. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. However, neither compares to the Muncie in terms of strength. Complete Transmission Lookup Tool from transend X3845157 GM. For example, the first X will be a Letter from A through L. Manufacturer Part Number. This stamping is usually alpha code indicating the source of the trans followed by several numbers indicating specific month & day the trans was assembled. Further Muncie identification Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). This is a 4 speed, overdrive unit. 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 Muncie is made of aluminum, and will not be rusty looking. Engine Casting Numbers Explained 1954-1962 Chevrolet, Serial Number/Engine Type/Series Designation, On the flat part of the Distributor Deck you will find a stamped Serial Number. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. Take the following steps to access and place the transmission pan: Most manufacturers stamp the transmission identification numbers on the transmission housing. 11. Transmission identification may be determined by finding the transmission application code in the following tables. So now that we have given you some insight into identifying the Chevy four-speed transmission, the next time you are scouring the swap meets or local Craigslist ad, youll have a better understanding of what you are looking at, and youll get exactly what you want. We are dedicated to giving you the technical support you need, when you need it! Manufactured from 76 through 81. K 170. Saginaw 3 speed ID? | Hot Rod Forum 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). A=M20 B=M21, C=M22). THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. gross weight. Use the shifter to shift gears and note the number of times it shifts. The Muncies appearance, design, and operation did not change much during the transmissions use in GM production cars. 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. Ford didnt offer its automatic transmission until 1951, and Mopar buyers had to wait until 1954. A manual transmission requires the driver to switch gears manually. Sep 20, 2004 #4 CRAZYREDNECK77 Member Sep 20, 2004 67 After identifying the transmission pan, you have to count the number of bolts. During the run of General Motors inclusion of four speeds in their cars, there were three variations possible. When repairing or restoring your Chevrolet car or truck, identifying the transmission youre running is a key element to avoid the automotive version of quicksand. The M22 was designed as a road race transmission, and the straighter angle of the gear teeth produced less heat and less end-loading of the gears. The length of the unit can also tell you a few things. Chevy Hardcore NEWSLETTER - SIGN UP FREE! Nov 16, 2011. The final digit is the year the engine was made WITHIN They are notoriously very hard to read and often people make the mistake of thinking a '3' is an '8'. NOT every company stands behind their work. Youll need a pictorial representation of these groups to identify the 4-speed transmission correctly. The Turbo 400 was GMs heavy-duty three-speed transmission used from 1964 to 1990. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. flashlight. 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. GM Transmission Identification Guide: Chevrolet, Pontiac, Buick, & More Enjoy the forum? Facebook, Tesla's electrokineticand electrogravitic machineAir Ship Designs 1911, IEEE Computer Magazine Special Issue on Making: Free Download, 2023 Created by Wil Cashen. The best way to identify a GM automatic transmission is by observing the transmission pan. The first letter will be either. now = new Date The 700R4 became the 4L60 and so on. A typical Saginaw assembly date stamp would be S313 indicating Saginaw trans produced March 13. Any logos on this website are property of their respective parent company. These grooves are there to indicate the ratios of the gears inside the transmission. Report an Issue | thoughts? GM Turbo 350 and 350C (TH350 Transmission) 3 Speed Transmission. There are different ways to determine the transmission type of a GM vehicle. Comparison images courtesy of Hurst Shifters. 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). The Turbo 350 quickly became known for its strength, versatility, and compactness. Joined: Dec 2, 2001 Messages: 26 Location: Midwest City USA. You need to look . 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Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings. The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. This one will have a CONveyor Number and beside that Starting with the 1966 models, the wide ratio versions got two rings around the input shaft, and the M22 input shaft had no rings and looks like a 1963 through 1965 wide-ratio input shaft. This number will contain division ID #, model year, assembly plant and production sequence (last 6 digits) of the VIN stamped onto the transmission. Thank you for working with us. Transmission I. D. | Classic Parts Talk On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side. The identification problems mostly happen with the older 4-speed manual models. Vehicles leaving the factory with an axle ratio of 3.55 and numerically lower gears, typically incorporated a wide-ratio transmission. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). Add to quote; Share Only show this user. There is no leaking coming from the front seals, rear sears or oil pan.