Besides the transmission identification, it also helps to figure out which options was the car ordered with by using a VIN decoder tool. Manufacturer Part Number. Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift) These classic GM models have different complex applications under manual transmission and automatic transmission. You will have to decipher the numbers on the ID tag in order to properly tell exactly what kind of transmission you have. Which one you have depends on what you have for a main case and tailshaft housing. You don't have any products in your shopping cart. It's worth the price of membership! 1991 and Newer Expert advice on car parts, maintenance, and repair. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. This is because the transmission lengths are the same and the positioning of the cross member can be easily modified, you only need to change the transmission mount, add transmission cooler lines, and update the shift indicator to a Turbo 350 pattern to complete the exchange. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. 5. And keep in mind that not all will sport these grooves. Like I said, the Muncie HD is a lot heavier. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. You might have trouble observing the system if the vehicle has an installed gearbox. It is identified easiest by its 375-THM designation cast in the underside of the tail housing. Transmission Identification & Decoding. TRANSMISSION CASTING NUMBERS - Vintage Chevrolet Club - Discussion Forum Borg Warner once again started supplying four speeds to GM in the early 70s with the release of the Super T10. But, those built between 1963 and 1965 will not have any rings around the input shaft. It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. Outside that, you can push in your clutch and hold the brake. 3854728. We will safeguard your e-mail and only send content you request. Chevrolet Chevy Transmission Identification and Decoding But in non-performance applications, they were still a good Chevy four-speed transmission. With an old GM 4-speed manual, you have to observe the transmission system side profile. Automatic transmission types are generally identified by their pan shape. The source serial number contains additional information such as model year, division identification number, manufacturing plant, and production sequence. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. This is when you have to remove the side cover to see what's inside. Your HTML, scripts like Google Ads, images/links, go right here. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. The additional letter codes as follows: Of course like engines, transmissions come and go over time, so below is the (as complete While the Chevy four-speed manual transmission was a staple in many muscle cars, even many of the Generals other car models were equipped with a manually operated gear selecting device. Generally, in 68-71 vehicles, the switch is located on the carburetor. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. by three Numbers and ending in another Letter (or two). If you prefer official decoders, you can check the National Highway Traffic Safety Administrations website. If it is still attached, the ID can be found in several places on the transmission: If youre under a car trying to read this, it can be tough. However, there were several design upgrades and modifications made during the total production run. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. The first and most obvious has to do with the size of a cars engine. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. The M-22 was generally installed behind Monster Transmission & Performance does not claim ownership of any outside trademarked brands or images. Gm 3 speed manual transmission casting numbers From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. VCCA members have access to a list of over 50 Technical Advisors who can help you with your car. Casting numbers on the case and extension housing. The easiest method of GM automatic transmission identification is to examine the transmission pan. duty close ratio" M-22, also known as the "Rock Crusher". 2. 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. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. The Powerglide was Chevrolets main automatic transmission through the mid-1970s. transmission identification confusion | Chevy Tri Five Forum Powered by, Badges | The center two digits are the day of the month. 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. 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). So it's definitely something you want. Example: 19N500001. There were a total of six types. 12. Download Gm manual transmission identification numbers, Read Online Gm manual transmission identification numbers, http://virtual-village.ning.com/photo/albums/pairing-apple-watch-i-icon-user-manual-guide, https://elimuspace.com/?post_type=dwqa-question&p=31547, https://smkn4malang.sch.id/?post_type=dwqa-question&p=28056, http://teslacommunity.com/photo/albums/nice-pancreatitis-guidelines#.Y3QvpNtByNQ, http://teslacommunity.com/photo/albums/kidde-carbon-monoxide-detector-installation-instructions#.Y3QvTdtByNQ, http://teslacommunity.com/photo/albums/barista-handbook-pdf#.Y3Qv8NtByNQ, http://teslacommunity.com/photo/albums/secadora-mabe-9-kilos-manual#.Y3QvQNtByNQ. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. - Date Casting Codes JavaScript is disabled. Looking Up The 17-Digit Vehicle Identification Number. It was phased out of use and superseded by GMs 700R4 starting in 1982. Transmissions available: 3 Speed manual, 3 Speed manual with overdrive on 1/2 ton only, 4 Speed manual and two automatics; Powerglide and Turbo Hydra-matic. 14. While the big-block vs. small-block variable is one that has two groups of passionatefollowers, the other reflects the way in which the driver selects transmission gears. box FWIW. VIN decoders are helpful, and they come in handy when you need to know more about your vehicle. Your right, if we knew what the trannys went to , they could be of help to someone if not only for parts. Comparison images courtesy of Hurst Shifters. Awfully close to a Muncie (3925660). You can find the source serial number near the transmission code. The Saginaw reverse shift lever is on the cover, and the cover has 7 bolts. This frees up the geartrain. 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. Clean the area thoroughly and use a nice bright flashlight. Its no secret that the Saginaw and Borg Warner transmissions were not built to handle the kind of power that a Muncie transmission could withstand. 1969-1986. Also, the chances of older cars having an intact manual are slim. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. 1. They are notoriously now = new Date The pan contains several stamped numbers and codes informing readers about the transmission system. 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. The first letter will be either. Supposing it shifts six times, its a 5-speed system. 1962-1973. There are a couple of different debates that typically occur when a bunch of car guys get together. Need help to decode Saginaw 4 speed transmission The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox. Found on 76 through 84 models. decode saginaw 4-speed | Team Camaro Tech 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 Turbo 350 quickly became known for its strength, versatility, and compactness. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. If you have ever heard that the new Quick Decoding - Chevelle Stuff It was standard equipment on large displacement, high-torque engines, and is generally found in trucks, and full-size GM rear-wheel-drive cars. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. theYear=now.getYear() 7. Input has 3 rings so it should have the 3.50 first gear. When you find a used four speed, a Saginaw and Borg Warner transmission will likely be flash rusted because of the cast-iron construction. Here's a typical Muncie gearset consisting of First, Second, and Third gear. They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. We are dedicated to giving you the technical support you need, when you need it! Some transmissions will have a code stamped onto them while others have a tag riveted to the case. There is no difference other than the name. Search transmissions by vehicle's VIN, License Plate, or Year/Make/Model information. 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. Main cases manufactured prior to May 7, 1963, will say Patent Pending. On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side. 1965 and Newer. 3 speed manual out of a 55.1 Chevy Truck. We need to make note that the early Muncie transmissions offered between 1963 and 1965 utilized a 7/8-inch countershaft in the cluster gear, and those manufactured between 1966 and 1974 used a 1-inch diameter shaft. Older vehicles are quite different because theres a lot of variety when it comes to transmission systems. The muncie reverse lever is in the extention housing, and the cover has 7 bolts. 4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and "electronic" models were named 4L60E. When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. theYear=theYear+1900 18L165790 The Powerglide on the left is a cast-iron unit from a 1958-62 Chevrolet. Varying axle ratios were featured on the various gearbox and engine types per the below table. [CDATA[ 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. Become a VCCA member! Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. The Turbo 375 was a version of the transmission used from 1972 through 1976, in small displacement cars. On the right is the small input shaft bearing, which is 1963 only. Apart from numbers, General Motors transmission ID tag has codes. The transmission underwent little change, the major difference was a switch from cast iron to an aluminum casting in 1963. 5. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Set up the wheel chocks behind the tires so theyre firmly on the ground. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. fileslib. On the right is the M22 countershaft with 27-teeth. Aavailable in a 3 speed auto or 4 speed manual transmission. THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This machined flat area has serial numbers The Muncie four-speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). We will safeguard your e-mail and only send content you request. On the Turbo 400, the VIN is stamped on a machined surface just above the pan on the drivers side. Evolutionary designs came with unique pan shapes, which are clear indicators of which transmission you are dealing with. Last edited: Dec 16, 2012. . Keep this in mind when you're searching for a Muncie transmission. Measure the pan and examine the shape. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. In 1974, the two-speed box then went to the great scrap heap in the sky. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". This modulator is stationed at the transmissions side, and there will be a vacuum line connected to it. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. Hopefully, this guide can help you decipher what gearbox you have located if youre in need of a Chevy four speed, or if you are fortunate enough to happen across one stashed away in a barn somewhere. The output shaft has the code # of 14030874. 1976 through 1981 model years. Gm manual transmission identification numbers. Responding to market demand for a three-speed automatic, The Turbo-Hydramatic 350 was introduced in 1969 as a replacement to the Powerglide in Chevrolet cars and trucks with six-cylinder engines or low-horsepower V8 engines. The Turbo 400 has a very distinct fluid pan. I have four transmissions, which I need to identify, before I can proceed. very hard to read and often people make the mistake of thinking a '3' is an '8'. Remember, check for a nearly square shape and 13 bolts. 9. Cast iron case, believe it is a Saginaw three speed, but not sure. Casting Number Year Notes, 3831704 1963 7/8-inch cluster, small bearing, 3839606 1963 1964 7/8-inch cluster, 3851325 1964 1965 7/8-inch cluster, 3864848 1965 7/8-inch cluster, 3885010 1965 1967 1-inch cluster, 3925660 1968 1970 1-inch cluster, 3925661 1970 1974 1-inch cluster, Casting Year Notes, 3831731 1963 Thin fin tailshaft, drivers side speedometer, 27 spline, 3846429 1963 Thin fin tailshaft, drivers side speedometer, 27 spline, 3846429 1963 1965 Thick fintailshaft, drivers side speedometer, 27 spline, 9779246 1964 1965 Pontiac Catalina long tailshaft, passengers side speedometer, 27 spline, 3857584 1966 1970 Passengers side speedometer, 27 spline, 3978764 1970 1974 Passengers side speedometer, 32 spline. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. CAUTION: This transmission closely resembles 343 Saginaw. The identification problems mostly happen with the older 4-speed manual models. 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. In the middle is the M21 countershaft and input shaft. Once you identify the pan, count the number of pan bolts for confirmation. You can get a guide or chart to help you place your transmission pan. Check through the information for your transmission identification. stamped into it. This is what "The World's Best Chevrolet Club" is all about! For 1964 and beyond, it rode on a bushing between it and the mainshaft. Note the single groove, meaning an M21 close-ratio. Here's another view of the M22's input shaft and countershaft. When introduced in upper-level Chevrolet models in 1950, the Powerglide represented the first automatic transmission offered by the Big Three. They are notoriously very hard to read and often people make the mistake of thinking a '3' is an '8'. We are grateful for the fact that Monster Transmission has gone BEYOND and we will continue to be the best publicity that you will every have.. 19. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. 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. The 3L80HD would be the THM475 (heavy duty unit). Youll need a pictorial representation of these groups to identify the 4-speed transmission correctly. Each number in the 17-digit VIN represents specific information about a vehicle. How to Identify Your Transmission - OnAllCylinders Joined: Dec 2, 2001 Messages: 26 Location: Midwest City USA. However, finding one of these transmissions now at a swap meet or salvage yard is getting harder and harder. Theres a good number of vehicles that make use of both manual and automatic transmissions. On the left is the M20 countershaft and 10-spline input shaft. Outside that, you can push in your clutch and hold the brake.