The 1969 and later models use a bolt to secure the linkage to the transmission. They are notoriously Gm manual transmission identification numbers. We will safeguard your e-mail and only send content you request. Here's another view of the M22's input shaft and countershaft. 7. 1993 and Newer (4L60E), 1980-1991 (AOD) The easiest way is by knowing the construction of each unit, and the differences are obvious. 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. When properly identifying a Saginaw transmission, the casting numbers are a surefire way to know for certain what youre looking at. 3L80 stands for three gears, longitudinal mount (rear-wheel drive), and the 80 signifies that it can handle 8,000 lbs. Comparison images courtesy of Hurst Shifters. . There is no difference other than the name. For example, replacing a Powerglide with a Turbo 350 is an easy swap. Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. GM 700R4 (4L60) not 4L60E . The first letter is almost always F since most GM engines were made in Flint, Michigan. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! You can find the source serial number near the transmission code. It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. This is a large reason why some guys will not rely on transmission identification by the input shaft grooves. 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 Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. The T-85 three-speed transmission was one result of that merger. Yes, you can tell what type of transmission from a VIN number. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. X3845157 GM. Generally used in straight and V6 and small block engines. FIRST TRANSMISSION. Numbers are displayed below, as they appear on the transmissions. 250 and 292 inline 6-cylinder engines offered, while a 305 V6 was available only in GMC trucks. a usually four digit letter/number combination separated like this: X XX X. It's worth the price of membership! On the THM700-R4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing. Some early 1969 transmissions did not have this code. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. The M-20 wide ratio, the M-21 close ratio, and the "Extra heavy Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. Identify General Motors' Four-Speed Transmissions 1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00 2 grooves: First 3.11, Second 2nd and 3rd row seats were optional. Nov 16, 2011. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. Last edited: Dec 16, 2012. . The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. 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 Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. 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. We will safeguard your e-mail and only send content you request. The 400 transmission has a main case of cast-aluminum alloy with a length of 24-3/8-inches long. Chevy Hardcore NEWSLETTER - SIGN UP FREE! very hard to read and often people make the mistake of thinking a '3' is an '8'. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. GM manual transmission identification. Also, the chances of older cars having an intact manual are slim. 9. To add a little confusion to the mix, there were Borg-Warner Transmissions that feature aluminum cases and cast-iron side covers. Some exceptions include the 1970 with either the SS396 or SS454, the 1971 and 1972 SS with the 454 engine where the H.D. From the outside, you should be able to make out the number on the metal dash plaque by looking through the glass. 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. 3845122 is the casting number of the transmission case for the 1955-1957 3 speed transmission for passenger cars and Corvettes. This list includes some GM transmissions. You can find out if your GM model is automatic by using the same method. If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. On the Turbo 350, 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 bell housing flange on the passenger side of the transmission. Once you identify the pan, count the number of pan bolts for confirmation. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! The Turbo 400 has a very distinct fluid pan. 1976 through 1981 model years. (1: Chevrolet, 8: 1968, L: Van Nuys, CA, 165790: last 6 digits of VIN). You have to decode these simple codes to read and understand the information. Identify General Motors' Four-Speed Transmissions 1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00 2 grooves: First 3.11, Second CAUTION: This transmission closely resembles 343 Saginaw. Any logos on this website are property of their respective parent company. A = January through L = December. 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. This is when you have to remove the side cover to see what's inside. Automatic Transmissions Some transmissions may have a code stamped into their case or a tag riveted to them. Jointly developed by Chevy and Buick, it is also known as the CBC (Chevrolet-Buick combined) 350. Main case#3925656 Extension#3925658 Side cover#6261886 also has a date 11-13-78 or 11-13-70 hard to make out . We are dedicated to giving you the technical support you need, when you need it! 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). The early GM Hydra-Matic transmission served the 1940-1968 Oldsmobile models. The M-22 has "straight cut" gears. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Some transmissions will have a code stamped onto them while others have a tag riveted to the case. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. On the right is the M22 countershaft with 27-teeth. The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. If the car has high-performance upgrades that substantially raise the engines torque output above 300 to 350 lb./ft. However, there are some methods you can apply to determine the transmission type your car uses. M38 Standard Turbo 350 manufactured from 1976 to 1981. This can add confusion to what you've found. 11. Transmission identification may be determined by finding the transmission application code in the following tables. 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. The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. When you have the two side-by-side it becomes obvious which is which. We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. Report an Issue | While its obvious that the four speed will use three shift-linkage arms and the three speed will have two, if the first letter is R, then you have found a four speed. GM Power Glide 2 Speed Transmission. by three Numbers and ending in another Letter (or two). Powered by UBB.threads PHP Forum Software 7.7.5. A manual transmission requires the driver to switch gears manually. Serif is a seasoned automotive enthusiast with a passion for cars. GM 8. now = new Date 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. 1982 and 1992 be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") General Motors is an innovator in the automobile industry, and they were one of the early adopters of the automated transmission system. The first and most obvious has to do with the size of a cars engine. 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. MX2 Another 350C code. Muncie Transmission Identification. Generally able to handle up to 400 foot pounds of torque. Trust us to steer you in the right direction, when you choose to DIY. Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep track of what was what, it's best to ID your gearbox visually, taking what is stamped on the 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. This code was used for ten years from 1976 to 1986. THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. Before you can identify the transmission pan, you have to access it from under the car. Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) numbers here that I can prove, so this is a short list. If you have ever heard that the new It was standard equipment on large displacement, high-torque engines, and is generally found in trucks, and full-size GM rear-wheel-drive cars. When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. Transmission Stuff * Manual 3-speed transmissions * Muncie 4-speed Casting Numbers/Decoding/Identification * Powerglide * Turbo Hydramatic 350 * Turbo Hydramatic 400 * 200-4R/700R4 Overdrive * GM Transmission lengths & oil pan * Automatic transmission operating temps * TH350/TH400 Speedometer Gears Frames * Chevelle Frames Trim Tags FORD (336) BORG-WARNER T-10, GM AS-3 (410) *MUNCIE Shaft Identification:. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Powered by, Badges | Use the shifter to shift gears and note the number of times it shifts. The M20 and M21 used a gearset with a more angled tooth design on each gear (left). Casting Number Notes, 3831707 Early side cover; 1963 1965, 3884685 Early side cover; used with 3857584 tailshaft housing, 3950306 Late side cover no switches, 3952642 Late side cover with transmission controlled spark switch, 3952648 Late side cover with transmission controlled spark switch, 335308 Late side cover with neutral safety switch. Muncie (left) Saginaw Tweet This frees up the geartrain. A mechanically robust transmission, it was used in other General Motors vehicles as well. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. 20. The cases offer a broad range of interchangeability. The easiest method of GM automatic transmission identification is to examine the transmission pan. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. SECOND TRANSMISSION. As a manufacturer, GM also applied numerous transmission systems in their older models. my Saginaw #'s . 1. If you are installing your transmission that was purchased from Monster Transmission, our sales and support staff is here. Many enthusiasts feel that for a car to be a true muscle car it must have a four-speed transmission. Looking for a Muncie shifter engineered to fit within your budget? Cast iron case, believe it is a Saginaw three speed, but not sure. The Fora platform includes forum software by XenForo. 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. This page covers automatic trannies. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. Muncie 4-speed or TH400 were the only transmission options available. 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. 3L80 - The 3L80 is a renamed THM400, used in the early 1990's. Part of the problem with GM 4-speed systems is that theres a lot of variety. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The length of the unit can also tell you a few things. Transmissions can be identified in the following manner: Casting numbers : Located on the case, extension housing and side cover (manual). Glean the basics and use them in your research. Remove the side cover and forks for a look at the geartrain. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. Use the shifter to shift gears and note the number of times it shifts. 2. Use the owners manual to find information such as the transmission pan length, shape, and more. All rights reserved. // ]]> Ning Network Name Goes Here. Keep this in mind when you're searching for a Muncie transmission. Thanks Dec 11, 2012 #2 G Gary S Administrator Lifetime Gold Member Apr 14, 1999 24,823 Its useful to know the trim of your car so you can easily determine the transmission type. 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. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. Remember, check for a nearly square shape and 13 bolts. This version did not have a locking converter. tailgate or cargo doors. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. 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). Input the VIN in a decoder and search. The 1963-'65 M20 input shaft will not have grooves. If it starts with an S, you are looking at a three-speed Saginaw. From left to right are the three basic Muncie input shaft/countershaft combinations. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. S = Saginaw 3-speed A = 68/69 L6 Torque-Drive K = McKinnon 3-speed C = Cleveland Powerglide . fileslib. Almost all Muncie transmissions were delivered with a groove(s) on the input shaft and counter gear. 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Yes, there is a serial number on a transmission. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. severely powerful (high torque) big-block engines. On the left is the M20 countershaft and 10-spline input shaft. duty close ratio" M-22, also known as the "Rock Crusher". The casting number 3925660 denotes this as a 1968 1970 Muncie with a 1-inch cluster shaft. These grooves are there to indicate the ratios of the gears inside the transmission. 14. 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. The Borg Warner has a 9 bolt cover. They used -E to distinguish the electro Hydra-Matic transmission from other non-electronic ones. The transmission pan is one of the most precise methods of identifying a transmission. On the Turbo 400, the VIN is stamped on a machined surface just above the pan on the drivers side. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. Theres a good number of vehicles that make use of both manual and automatic transmissions. Measure the pan and examine the shape. 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. General Motors used different transmission pan shapes and bolts for its models, so this method requires some knowledge of the pans. Chevy Automatic Transmission Description & Usage Go here for Chevy Manual Transmission Identification. 1991 and Newer Typical Turbo 350 fluid pan. In modern cars, you can quickly identify the 6-speed and 5-speed transmission applications. Unlike the Turbo 350, instead of a kick down cable, it uses an electrical slide switch, which is controlled by the throttle linkage. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). 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 problem with checking the owners manual is that a junkyard find wouldnt have one. The SM465 was made by General Motors from 1968 to 1991. Steel tag on the passenger side: This machined flat area has serial numbers 60 is the strength rating (less than the 4L80). 18L165790 The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. I definitely recommend a look at these transmissions, you've got to have a look. WinCon Member. Clean the area thoroughly and use a nice bright Older vehicles are quite different because theres a lot of variety when it comes to transmission systems. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. GM Turbo 2004R (2004R Transmission) Overdrive Transmission. It was used on large displacement, high . It also uses the same vacuum modulator as the Turbo 350. The numbers stamped below the shifter cover are M3E07A. The Muncie four-speed, like the T-10, is a side-loading transmission. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. The Muncie is made of aluminum, and will not be rusty looking. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. PDF file: gm 3 speed manual transmission casting numbers Page: 1 Save this Book to Read gm 3 speed manual transmission casting numbers PDF eBook at our Online Library.. 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. 691747 OR 591747. Your right, if we knew what the trannys went to , they could be of help to someone if not only for parts. Identifying a Powerglide is a matter of locating the source code on the transmission block and decoding it to find the units year of manufacture and of course, the 13 bolt holes on the pan.