All rights reserved. Standard Borg Warner H.D. Main case#3925656 Extension#3925658 Side cover#6261886 also has a date 11-13-78 or 11-13-70 hard to make out . If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. 1993 and Newer (4L60E), 1980-1991 (AOD) General Transmission Identification. Supposing it shifts six times, its a 5-speed system. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. 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. The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. A = January through L = December. Not only are the Saginaw and Borg Warner side cover and tail housings constructed of different materials, but the reverse shifter arm of a Saginaw is on the side cover while the T10 is located on the tail housing. +$20.00 shipping. The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). They created a standardized naming system across the product line and changed the name of the Turbo 400 to 3L80. THM200 - Light duty, "metric" 3 speed transmission. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. stamped into it. Keep this in mind when you're searching for a Muncie transmission. Due to this, the box tends to Cast iron case, believe it is a Saginaw three speed, but not sure. GM Turbo 400 TH400 Transmission 3 Speed Transmission. FORD (336) BORG-WARNER T-10, GM AS-3 (410) *MUNCIE Shaft Identification:. But, those built between 1963 and 1965 will not have any rings around the input shaft. On the THM350, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission. 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). (on manual trans). In the early 90s, GM introduced its electronic Hydra-Matic transmission systems. In 1974, the two-speed box then went to the great scrap heap in the sky. Note partial VIN stamped at the bottom. 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. 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. Making this separation makes the job easier. It is widely known as one of the best automatic transmissions ever built. 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. 8. 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). 14" X 6" Rally 1 wheels were featured as an option on the 1966 GTO along with the standard 14" X 6" stamped steel . The visible difference between manual and automatic cars is the third pedal, called a clutch. 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. This was used in A-body and F-body cars and Corvettes into the early 80s. Tweet 60 is the strength rating (less than the 4L80). Found on 76 through 84 models. General Motors has produced a myriad of versions of its fabled automatic transmissions over the years, although three models make up the bulk of pre-ECM GM slushboxes; the Powerglide, the Turbo-Hydramatic 350 (Turbo 350), and the Turbo-Hydramatic 400 (Turbo 400). possible Letters for the last ones are explained in the chart below. - Casting numbers on the case, extention housing and side cover Good, solid, rugged construction makes it a terrific drop-in for around $100. 13. The M20 and M21 used a gearset with a more angled tooth design on each gear (left). There are a couple of different debates that typically occur when a bunch of car guys get together. Example: 19N500001. 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. They are notoriously In 1974, the two-speed box then went to the great scrap heap in the sky. You can find out if your GM model is automatic by using the same method. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. These grooves are there to indicate the ratios of the gears inside the transmission. The best way to ID the transmission is to count teeth. In fact, 1963 is a standalone year because changes in this box came almost immediately for 1964, beginning with the front bearing retainer, which was aluminum for 1963 and became cast-iron in 1964. Please click Accept Cookies to continue to use the site. These classic GM models have different complex applications under manual transmission and automatic transmission. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. by three Numbers and ending in another Letter (or two). . 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. This version did not have a locking converter. To add a little confusion to the mix, there were Borg-Warner Transmissions that feature aluminum cases and cast-iron side covers. This frees up the geartrain. When it comes to transmissions, no other company provides this level of commitment to their clients. Discussion in '1947-1954' started by Blueflame236, Dec 15, 2012. . Chevy Automatic Transmission Description & Usage According to Koval, the easiest way to identify an automatic transmission, though, is by transmission pan shape. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. Become a VCCA member! NOT every company stands behind their work. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. "Almost all have their own shape and pan bolt design," Koval said. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. This one will have a CONveyor Number and beside that It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. Note the single groove, meaning an M21 close-ratio. tailgate or cargo doors. 5. Sep 23, 2019. The 3L80HD would be the THM475 (heavy duty unit). You can find out from the specifications or by checking the foot pedals. However, there were several design upgrades and modifications made during the total production run. It also uses the same vacuum modulator as the Turbo 350. Drivers dont usually have a problem with identifying modern manual 5-speed and 6-speed transmission systems. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. Check the car flooring, and if theres a clutch pedal, the transmission is manual. thoughts? According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. 1982 and 1992 Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! Some transmissions will have a code stamped onto them while others have a tag riveted to the case. The Saginaw reverse shift lever is on the cover, and the cover has 7 bolts. This code was used for ten years from 1976 to 1986. Each number in the 17-digit VIN represents specific information about a vehicle. The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") If the gear shifts five times, its a 4-speed transmission. Download Gm manual transmission identification numbers Read Online Gm manual transmission identification numbers. Generally able to handle up to 400 foot pounds of torque. This early box began its career being placed in the Corvette. Automatic transmission types are generally identified by their pan shape. We will safeguard your e-mail and only send content you request. The plant code was a prefix, while the production date had a numerical value. The first letter will be either. (AODE & 4R70W). If a car came with an axle ratio of 3.73 (or numerically higher), it usually came with a close-ratio transmission. Besides the transmission identification, it also helps to figure out which options was the car ordered with by using a VIN decoder tool. For example, a GM vehicle from before 1967 has an ID tag that looks like C123N. ~David PS ..I would think pictures of all 3 could help us if you could post some. Did you know that there are various models that were used in various cars? You can use things like the pan material, length, and shape to identify it. 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. 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. The fluid pan shape is irregular, being likened to distorted Texas state borders. $750.00 My question is will this direct swap to a '81 with the 3 speed saginaw? You can check the cars specifications online to determine if it uses a manual or automatic transmission. Nov 16, 2011. The NHTSA has some VIN check tools that can assist in identifying transmission types. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. This number will contain a division identification number, the model year, and the assembly plant and production sequence (last six digits) of the vehicle identification number (VIN) stamped onto the transmission. It was phased out of use and superseded by GMs 700R4 starting in 1982. 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). GM Turbo 350 and 350C (TH350 Transmission) 3 Speed Transmission. We will safeguard your e-mail and only send content you request. Add to quote; Share Only show this user. 21. severely powerful (high torque) big-block engines. But the other numbers don't match the extension or sidecover casting numbers. Transmissions have RPO numbers, usually beginning with "M". The 1964 through 1968 Muncie side covers had a stud coming out of the side cover that secured the linkage arm via a nut. This is usually a 7 digit number and each letter/number is about 1/2" tall. It is a cast iron case tranny with either a 2.85 first gear or a 2.54 first gear. [CDATA[ Serif is a seasoned automotive enthusiast with a passion for cars. There is no real performance potential in the smaller 4.3 version, and it should be avoided or replaced with the larger LT1/LT45.7L engine if high performance is the goal. Comparison images courtesy of Hurst Shifters. 10. Because this mainshaft is larger, you're also going to need larger bushings and seals. Vehicles leaving the factory with an axle ratio of 3.55 and numerically lower gears, typically incorporated a wide-ratio transmission. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. the angle of the gear teeth. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. Now, lets explore GM transmission identification, the different methods, and more. Part of the problem with GM 4-speed systems is that theres a lot of variety. 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. Muncies are the hot tip, since they usually were used with high performance engines. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). The code interpretation is (Cleaveland Powerglide, January 23rd, Night shift). Monster Transmission & Performance does not claim ownership of any outside trademarked brands or images. 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. 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 vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. Generally, in 68-71 vehicles, the switch is located on the carburetor. my Saginaw #'s . GM Turbo 200 and 200C: 3 Speed Transmission. Generally able to handle up to 400 foot pounds of torque. Casting numbers on the case and extension housing. gross weight. 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. Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) WinCon Member. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! JavaScript is disabled. The Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. You cant simply look at your classic car and identify the type of transmission it uses. That is why we offer multiple ways for you to search for your transmission. The M-22 is distinguished from an M-21 by 11. There are two significant variations of the Turbo 400. Differentiating is easy, as the Muncie has seven bolts holding the side cover, and the Borg-Warner uses nine. . Input the VIN in a decoder and search. When you have the two side-by-side it becomes obvious which is which. On the Turbo 400, the VIN is stamped on a machined surface just above the pan on the drivers side. In 1962, aluminum units were only used with the 327 engine, but by 1963, all Powerglides had aluminum cases. Further Muncie identification Some transmissions have a code stamped onto them. Casting is located above side cover, on trans. The one on the right is an aluminum-case Powerglide. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). 1965 and Newer. 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. After 1967, GM switched things up and changed the code structure. More items related to this product. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. (1: Chevrolet, 8: 1968, L: Van Nuys, CA, 165790: last 6 digits of VIN). If youre unaware, the production sequence is the last six numbers of your VIN. 20. MV4 This code identifies your turbo 350 as a C model, which had a locking torque converter. Still hoping for some casting number identification assistance, if someone is willing to help. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Check through the information for your transmission identification. While the M21 and M22 did have the same gear ratios, the M22 did utilize a cluster gear with the gear teeth having different tooth angles. 2.1Date codes 3GM transmissions, including Muncie M20, M21, M22 4Automatic transmissions 4.1AMC automatic transmissions, 1972-'06 4.2AMC automatic transmissions, 1955-'71 4.3Jeep automatic transmissions, 1971-back 4.4Transmission dimensions 4.4.1Ford 4.4.2MOPAR 4.5Ford automatic transmissions 4.5.13-speed identification 4.5.24-speed identification The trailing letters denote what the engine was installed in. case. Before you can identify the transmission pan, you have to access it from under the car. 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YOU DO. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. The length of the unit can also tell you a few things. A=M20 B=M21, C=M22). We have salvaged more than one Saginaw from cars like the Vega and Monza. And keep in mind that not all will sport these grooves. He digs all flavors of automobiles, from classic cars to modern EVs. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. When properly identifying a Saginaw transmission, the casting numbers are a surefire way to know for certain what youre looking at. I promise you that the next transmission I have to replace or any other person I hear of needing a transmission I will be heavily promoting Monster Transmission and tell them that I personally use Monster Transmission. 1981-1990. CASE: GM 20 3799193 D1162 TAIL: 3707195 COVER: (4 bolt) 3731911 . The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. However, this method requires extensive knowledge of the oil pans. If you are installing your transmission that was purchased from Monster Transmission, our sales and support staff is here. 3 Muncie 4 speeds were offered. You might have trouble observing the system if the vehicle has an installed gearbox. Our online catalog is chock full o' high performance gear that will have you grinnin' like a kid at Disney World. Yes, you can tell what type of transmission from a VIN number. As long as you have the correct transmission shift levers, it should't be much to convert to the later trans, but I'd probably start with the Saginaw, given the choice. 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. These grooves were cut into the input shaft so assembly line workers at the plant could easily identify which input shaft should be installed in a particular unit. THM400 - The THM400 was GM's Heavy-duty 3-speed transmission used from 1964 to 1990. This modulator is stationed at the transmissions side, and there will be a vacuum line connected to it. The muncie reverse lever is in the extention housing, and the cover has 7 bolts. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. numbers here that I can prove, so this is a short list. The first and most obvious has to do with the size of a cars engine. When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. 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. A forum community dedicated to hot rod owners and enthusiasts. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. The source serial number is from the CAR the transmission originally went into, NOT the assembly plant. and will have no numbers stamped on that deck. The SM465 was made by General Motors from 1968 to 1991. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. While you can get a lot of information for free in this forum, sometimes the info that you REALLY need is only available from the right person. It functions correctly. The 1969 and later models use a bolt to secure the linkage to the transmission. WE ARE READY TO SUPPORT YOUMon - Fri 9:00am - 6:00pm EST. MX2 Another 350C code. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. Hi. Transmissions can be identified in the following manner: Casting numbers : Located on the case, extension housing and side cover (manual).
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