THM200 - Light duty, "metric" 3 speed transmission. VIN decoders are helpful, and they come in handy when you need to know more about your vehicle. You can get a guide or chart to help you place your transmission pan. According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. Even the Muncie has its limitations, but they are significantly higher than the Saginaw or Borg Warner. Chevy Hardcore NEWSLETTER - SIGN UP FREE! His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. It's worth the price of membership! Ford didnt offer its automatic transmission until 1951, and Mopar buyers had to wait until 1954. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. This stamping is usually alpha code indicating the source of the trans followed by several numbers indicating specific month & day the trans was assembled. Off of the left side of trans: GM 3845122 H254 Thanks. However, classic cars usually have manual transmissions. Note partial VIN stamped at the bottom. 3L80 stands for three gears, longitudinal mount (rear-wheel drive), and the 80 signifies that it can handle 8,000 lbs. Another quick way to identify a Turbo 400 is to look at the kick-down mechanism. Has the casting # of 3925656. 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 Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. 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). This machined flat area has serial numbers Whats The Reason Enthusiasts Cant Get, Yes I Am A Dinosaur, And Why I Feel Electric Cars, Step-By-Step Birth Of A QA1 Adjustable Racing Shock, Readers Rig: Sterling Diesels Duramax-Powered C10, What I Learned Today With Jeff Smith Ensuring Wrist Pin Clearance, Corvette Enthusiasts Use Media To Share Z06 Delivery, Fenix Is A Next-Gen 69 Camaro With 1,180 Horsepower, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop Shop, Moroso Anti-Roll Kit Is The Right Tool For The Dragstrip, Near where the shift linkage attaches to the body, Just above the housing on the right side of the pan, On the passenger side on a flange by the bell housing. Dave Cruikshank is a lifelong car enthusiast and an editor at Power Automedia. The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. I only put the makes this job easier. The best way to identify a GM automatic transmission is by observing the transmission pan. 3925658 does not match any casting numbers in my books. Almost all Muncie transmissions were delivered with a groove(s) on the input shaft and counter gear. (AODE & 4R70W). The first letter is almost always F since most GM engines were made in Flint, Michigan. Pure dumb luck will lead you to a completely unmolested Muncie. Generally used in straight and V6 and small block engines. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. Powerglide transmissions were cast with the word Powerglide along the body, Assembly Date Code Stamping can be stamped anywhere, Chassis VIN Number stamping or source serial number- beginning in 1962. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. Generally able to handle up to 400 foot pounds of torque. 15. 1993 and Newer (4L60E), 1980-1991 (AOD) 60 is the strength rating (less than the 4L80). Main cases manufactured prior to May 7, 1963, will say Patent Pending. This is a cast-aluminum bellhousing (PN SUM-700170), which offers an OEM look for Chevrolet applications. The Turbo 350 quickly became known for its strength, versatility, and compactness. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Muncie 4-speed or TH400 were the only transmission options available. 250 and 292 inline 6-cylinder engines offered, while a 305 V6 was available only in GMC trucks. Yes, you can tell what type of transmission from a VIN number. Use the owners manual to find information such as the transmission pan length, shape, and more. The differential ratio is stamped on the passenger side axle tube. box FWIW. Note the single groove, meaning an M21 close-ratio. If you have ever heard that the new First came the Borg-Warner T10 beginning in the late 50s. Generally used in straight and V6 and small block engines. The plant code was a prefix, while the production date had a numerical value. This is what "The World's Best Chevrolet Club" is all about! Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep They are notoriously There are two significant variations of the Turbo 400. Above is the transmission ID tag on a 1970 Corvette. Its useful to know the trim of your car so you can easily determine the transmission type. From the outside, you should be able to make out the number on the metal dash plaque by looking through the glass. 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. This two-speed box thrives after 71 years and still sees use in motorsports and classic cars. document.write(theYear) The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. It also uses the same vacuum modulator as the Turbo 350. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Become a VCCA member! Take the following steps to access and place the transmission pan: Most manufacturers stamp the transmission identification numbers on the transmission housing. Expert advice on car parts, maintenance, and repair. CASE: GM 20 3799193 D1162 TAIL: 3707195 COVER: (4 bolt) 3731911 . It also has the numbers "4.3" cast in the block itself, which makes it easy to spot as the smaller 3.74-inch-bore block. And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. Identifying the transmission on your project car ensures that you have the right parts and avoid any errors during the restoration process. Engine Casting Numbers Explained 1954-1962 Chevrolet The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. New transmission designs came with new, unique pan shapes, and the general shape of the pan often paints a fairly clear picture of which automatic transmission you are dealing with. Cast iron case, believe it is a Saginaw three speed, but not sure. You can find out from the specifications or by checking the foot pedals. 2. The code interpretation is (Cleaveland Powerglide, January 23rd, Night shift). Removal of the front bearing cover is where disassembly begins. gross weight. My question is will this direct swap to a '81 with the 3 speed saginaw? Casting numbers on the case and extension housing. 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. The numbers 3831707 and the shifter linkage being attached with studs and nuts make this a side cover for an early Muncie. - Date Casting Codes 3925656 is the casting number for the saginaw used in 68-75 at least. The 1956 through 1962 Corvettes only used the aluminum versions. This is when you have to remove the side cover to see what's inside. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. We have salvaged more than one Saginaw from cars like the Vega and Monza. They created a standardized naming system across the product line and changed the name of the Turbo 400 to 3L80. These numbers can be found on the transmission case, and the first letter in this series of numbers is going to tell you exactly which Saginaw transmission you are looking at. The M-22 was generally installed behind Many enthusiasts feel that for a car to be a true muscle car it must have a four-speed transmission. Before you can identify the transmission pan, you have to access it from under the car. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! 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. 3 speed manual out of a 55.1 Chevy Truck. The M-21 has a higher pitch angle on its gear teeth. Dave loves music, design, tech, current events, and fitness. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. You might have trouble observing the system if the vehicle has an installed gearbox. But, those built between 1963 and 1965 will not have any rings around the input shaft. The "kick down" switch locations for the Turbo 400. The length of the unit can also tell you a few things. Some transmissions have a code stamped onto them. Differentiating is easy, as the Muncie has seven bolts holding the side cover, and the Borg-Warner uses nine. Muncies are the hot tip, since they usually were used with high performance engines. K 170. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. severely powerful (high torque) big-block engines. CD-68-315953 Main case#3925656 Extension#3925658 Side cover#6261886 also has a date 11-13-78 or 11-13-70 hard to make out . Theres a good number of vehicles that make use of both manual and automatic transmissions. A mechanically robust transmission, it was used in other General Motors vehicles as well. GM Power Glide 2 Speed Transmission. For 1964 and beyond, it rode on a bushing between it and the mainshaft. There are six known Muncie side covers. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. 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.
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