gm 3 speed manual transmission casting number decoder

It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. 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). To add a little confusion to the mix, there were Borg-Warner Transmissions that feature aluminum cases and cast-iron side covers. The M20 and M21 used a gearset with a more angled tooth design on each gear (left). Never underestimate the mighty post-war Powerglide. GM Turbo 350 and 350C (TH350 Transmission) 3 Speed Transmission. The casting number 3925660 denotes this as a 1968 - 1970 Muncie with a 1-inch cluster shaft. 1993 and Newer (4L60E), 1980-1991 (AOD) That the Muncie has much in common with the T-10 is no accident. The Muncie is made of aluminum, and will not be rusty looking. Ford didnt offer its automatic transmission until 1951, and Mopar buyers had to wait until 1954. 1981-1990. VCCA members have access to a list of over 50 Technical Advisors who can help you with your car. This early box began its career being placed in the Corvette. GM Transmission Identification Guide: Chevrolet, Pontiac, Buick, & More Saginaw 3 speed ID? | Hot Rod Forum Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. General Motors has variety when it comes to automatic transmissions, and some of them have different pan shapes. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. A=M20 B=M21, C=M22). Chevy Automatic Transmission Description & Usage The casting number 3857584 tells us that this is a 1966 or 1970 Muncie tailshaft. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. 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). The 17-character number is a form of code that identifies the vehicle's specifications. Guide to Muncie M20, M21, and M22 Four-Speed Transmissions Few things excite like the sound and feel of an old-fashioned Chevrolet muscle car and that familiar whine of a classic Muncie four-speed transmission going through the gears. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. Please check your browser settings or contact your system administrator. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. The 1964 through 1968 Muncie side covers had a stud coming out of the side cover that secured the linkage arm via a nut. Transmission identification may be determined by finding the transmission application code in the following tables. Automatic Transmissions Some transmissions may have a code stamped into their case or a tag riveted to them. When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. Manual transmission systems are straightforward to spot. THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. GM Power Glide 2 Speed Transmission. We said almost all Muncie transmissions had a groove(s) around the input shaft, and that is because most close-ratio Muncies will have one ring around the input shaft. Many enthusiasts mistakenly refer to all Muncies as Rock Crushers, and this is just not appropriate. It was phased out of use and superseded by GMs 700R4 starting in 1982. 8. 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. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. It is a cast iron case tranny with either a 2.85 first gear or a 2.54 first gear. GM Turbo 200 and 200C: 3 Speed Transmission. The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. The SM465 was made by General Motors from 1968 to 1991. You can check the cars specifications online to determine if it uses a manual or automatic transmission. You can get a guide or chart to help you place your transmission pan. The fluid pan shape is irregular, being likened to distorted Texas state borders. now = new Date It is widely known as one of the best automatic transmissions ever built. 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. When you have the two side-by-side it becomes obvious which is which. The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. All rights belong to the entity responsible for the trademark or copyright. If the gear shifts five times, its a 4-speed transmission. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. If you have ever heard that the new On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side. 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. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 . Chevrolet Chevy Manual Transmission Identification and Decoding For example, replacing a Powerglide with a Turbo 350 is an easy swap. Yes, there is a serial number on a transmission. 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. GM 8. Identify Your Transmission, Transmission Lookup, Transmission specs, GM style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. Depending on how you ordered your muscle car in the 60s and early 70s, you might have even benefitted from the famous Muncie transmission. [CDATA[ There are different ways to determine the transmission type of a GM vehicle. 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. Generally used in straight and V6 and small block engines. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. 6. There are not too many gearboxes that can make that claim. Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. Thank you Monster Transmission. Serif is a seasoned automotive enthusiast with a passion for cars. You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. . YOU DO. The Turbo 400 has a very distinct fluid pan. You can find out if your GM model is automatic by using the same method. 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. Before using any method to find your transmission type, you should find out if its a manual or automatic transmission. Whether youre trying to repair your transmission or rebuilding a project car, its crucial to identify the transmission type. Due to this, the box tends to 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 1982 and 1992 20. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. 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. 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. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Now, lets explore GM transmission identification, the different methods, and more. 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). stamped into it. Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep Chevrolet Chevy Transmission Identification and Decoding Saginaw 3 speeds were built in both Saginaw, Michigan & Munchie, Indiana. This includes but is not limited to Ford, Chevrolet, General Motors, Dodge, Mopar, or any other trademarked or copywritten content. The easiest way is by knowing the construction of each unit, and the differences are obvious. following numbers are the month first followed by the day of the month. My question is will this direct swap to a '81 with the 3 speed saginaw? Muncie (left) Saginaw Not only were they both popular transmissions in muscle cars and Corvettes, but many were even used after the muscle car era. You might have trouble observing the system if the vehicle has an installed gearbox. Knowledge of your cars transmission system is helpful during repairs and car restoration projects. Muncies are the hot tip, since they usually were used with high performance engines. Thediscussion about whether to use a four-speed or an automatic transmission has been going on for as long as anyone can remember, and we see no end in sight. From complete engines, to torque converters to Monster in a Box, we've got all your HP needs covered. 3L80 - The 3L80 is a renamed THM400, used in the early 1990's. The Powerglide on the left is a cast-iron unit from a 1958-62 Chevrolet. 3845122 is the casting number of the transmission case for the 1955-1957 3 speed transmission for passenger cars and Corvettes. Note partial VIN stamped at the bottom. These classic GM models have different complex applications under manual transmission and automatic transmission. Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. decode saginaw 4-speed | Team Camaro Tech He has spent years tinkering with vehicles and attended numerous car shows. 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.. This list includes some GM transmissions. Clean the area thoroughly and use a nice bright A mechanically robust transmission, it was used in other General Motors vehicles as well. Remove the side cover and forks for a look at the geartrain. 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. 15. 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). Even the Muncie has its limitations, but they are significantly higher than the Saginaw or Borg Warner. Knowing if your transmission is manual or automatic should be basic information. Others have a tag rivited to the case. The 3L80HD would be the THM475 (heavy duty unit). The length of the unit can also tell you a few things. As a manufacturer, GM also applied numerous transmission systems in their older models. On the left is the M20 countershaft and 10-spline input shaft. Gm manual transmission identification numbers. There are six known Muncie side covers. When properly identifying a Saginaw transmission, the casting numbers are a surefire way to know for certain what youre looking at. Manufactured from 76 through 81. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Muncie or Saginaw 3sp | NastyZ28.com Afterward, you can count the bolts securing the pan. For a better experience, please enable JavaScript in your browser before proceeding. 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. 21. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. This page covers automatic trannies. Vehicles leaving the factory with an axle ratio of 3.55 and numerically lower gears, typically incorporated a wide-ratio transmission. 14. Main case#3925656 Extension#3925658 Side cover#6261886 also has a date 11-13-78 or 11-13-70 hard to make out . THM200 - Light duty, "metric" 3 speed transmission. On the right is the small input shaft bearing, which is 1963 only. Complete Transmission Lookup Tool from transend Remember, check for a nearly square shape and 13 bolts. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. The right side numbers are 3925658 8338GM NFc4. Generally able to handle up to 400 foot pounds of torque. 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. 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. How To Identify Chevy Four-Speed Transmissions The numbers you are looking for are stamped (about 1/4" high) and usually a Letter followed The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. Two are early style side covers. Awfully close to a Muncie (3925660). Some GM brand models even have different transmission pan shapes and transmission types for different years. CAUTION: This transmission closely resembles 343 Saginaw. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. 16. (C: Chevrolet, D: 327, 68: 1968, 315953: sequential production number), Serial number stamped on the case, above the oil pan, driver side: Cast iron case, believe it is a Saginaw three speed, but not sure. Further Muncie identification Weve sourced more than one Saginaw from Vegas in junkyards. Not a T10 (1304 series); If its iron and has all three shift levers on the side cover, its a Saginaw. There is no difference other than the name. Please click Accept Cookies to continue to use the site. Powered by, Badges | GM 700R4 (4L60) not 4L60E . 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. Generally able to handle up to 400 foot pounds of torque. That is why we offer multiple ways for you to search for your transmission. and traction is enhanced, you can figure on eventually breaking the transmission. Apart from numbers, General Motors transmission ID tag has codes. PDF 3-speed Transmission I.d. Chart 4-speed Transmission I.d. Chart We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. The identification problems mostly happen with the older 4-speed manual models. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. GM Turbo 400 TH400 Transmission 3 Speed Transmission. This number will contain division ID #, model year, assembly plant and production sequence (last 6 digits) of the VIN stamped onto the transmission. item 2 Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios. document.write(theYear) Early Muncie 4-Speed Identification. Lets take a brief look at the backstory and origins of each transmission, and how you can visually identify them as well as locate ID tags and identification numbers. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. 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. Input has 3 rings so it should have the 3.50 first gear. The length of the unit can also tell you a few things. Chevy Hardcore NEWSLETTER - SIGN UP FREE! 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. 1969-1986. 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 When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. In the early 90s, GM rebranded all of its transmissions. 4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and "electronic" models were named 4L60E. May 31, 2006. 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. by three Numbers and ending in another Letter (or two). +$20.00 shipping. Discussion in '1947-1954' started by Blueflame236, Dec 15, 2012. . The two transmission systems manual and automatic, have different working principles. 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. Go here for Chevy Manual Transmission Identification. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Outside that, you can push in your clutch and hold the brake. The problem with checking the owners manual is that a junkyard find wouldnt have one. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! MX2 Another 350C code. We are dedicated to giving you the technical support you need, when you need it! The Turbo 350 quickly became known for its strength, versatility, and compactness. How To Identify Transmission By Vin - MicDot Gm 3 speed manual transmission casting numbers Anything after that time period will say US Patent No 3088336. Thanks Dec 11, 2012 #2 G Gary S Administrator Lifetime Gold Member Apr 14, 1999 24,823 The Muncie four-speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). 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. THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. GM Casting Numbers This frees up the geartrain. 60 is the strength rating (less than the 4L80). The number of bolts fastened to the pan is a way of being sure of the transmission system. MX3 Another Turbo 350 C code.