In this particular case I found that right here: http://www.chevytalk.org/fusionbb/showtopic.php?tid/76234/. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing TCI Stall Speed Chart JavaScript seems to be disabled in your browser. can anyone help with identifiying gm torque converters. Part Number: SUM-G2701 Cam you use a th350 torque converter on a 700r4?Lockup is easy to run. Now, for the the purpose of this guide there are two different ways that GM printed the the serial label. The 350 transmission is 21-3/4\" long and its one-piece case is cast of aluminum alloy. The one on the left came from the T350...I think. The next 2 or 3 letters identify the model of the transmission.These numbers tell us the application, engine size, wiring type, and solenoids. coa-100310-3-3 - 265mm maximum performance converter, triple torque multi-disk lock-up, billet cover (6 bolt), billet apply plate, trans brake compatible, 4l80e $1,375.00 Add to Cart You’ll not only need to hunt for this thing, but it needs to be free of enough grime to be legible. The one on the right is for a 350TH bolted to an internally balanced SBC. $13.49 $ 13. Free Shipping; $599.99. You’ll need to look above the coolant line fittings to see if there is a threaded screw there. Identifying the TH350 the Easy Way. MX3-  Another Turbo 350C code. I will point out the Buick , Olds , Pontiac style t-350 used a threaded pad and bolt design as the converter on the left side of the photo posted in the original message. There could be a lot of things that could cause problems in the torque converter. Power Adders or Naturally Aspirated. If you find 2 letters, the transmission is made between 1982-1985.. GM Turbo 200 and 200C: 3 Speed Transmission. Hays 97-1B36F Twister Full Race Torque Converter TH350, 3600-4200 $707.95 Hays 97-1B36Q Twister 3/4 Race Torque Converter, 1968-81 GM TH350 $489.95 Hays 97-1B42F Twister Full Race Torque Converter TH350, 4200-4500 $811.95 Reviews. The bolting flanges/bosses are different. Total Queries: 12 Zlib Compression is on. Earlier model Turbo 350 transmissions had a solid input shaft. You’ll also notice that the pan on the turbo 400 has quite a few more angles than the turbo 350. Certainly the easiest way to identify a GM automatic transmission is by the bolt pattern. It’s visually similar to it’s bigger sibling, but lacks the capability to handle a lot of torque. GM often bolted it behind it’s more anemic six cylinder engines. An "O" ring will be in a grove 1/4 of an inch back from the front of the shaft. If stock is all you want, you can take it to a converter shop and trade for a fresh stock unit. One more thing you can fall back on to identify the TH350 is the stampings placed on the transmission’s side. The Turbo 350 is arguably GM’s most popular automatic transmission with the aftermarket even today. There are a few things that all of the longitudinal gm automatic transmissions have in common. Both the TH350 and TH400 have a similar look. The replies made me dig deeper, and I have found I actualy have a TH350c. Revmax is proud to bring you the highest quality high performance converter on the market. I understand this means that it is a lockup TC, and that this trans is more than likely not the original out of this truck. from the others. The TH350C transmission was discontinued by GM years BEFORE 1987, so there is no way that it is stock in your truck. Sarge. This one was manufactured from 76-81. Thanks everyone. With a stock-type fuel pump and a 1970’s TH350 transmission, a great match here would be our 2000-2200 stall converter like PN 109-602. I owned a 1987 chevy truck with a t-350c trans.... 2 wheel drive truck. Is there any visual clues to identify this from a non lock-up? An exception to this theory is if the transmission/converter … If you use that rusty thing your pump seal will last about a minute. You’ll need to find the ID tag before you get anywhere. They all have basically the same bolt pattern on the bellhousing. GM Turbo 2004R (2004R Transmission)Overdrive Transmission Want to know the most common mistakes when installing a rebuilt transmission? Nearly all of the GM automatic transmissions have a few things in common. Share Video. Revmax is known worldwide for providing the best racing and diesel converters! It features an integral bellhousing. In any case, the one you have there will need a new hub, at least. It is about the only thing that breaks in a properly built TH350. I ditched a T400 from a parts truck and both converters say 350 on them (hand written with magic marker) I'm sure the T400 was stock, but rumour had it the T350 was originally bolted up to a strong engine once. GM used the TH350 in their vehicles starting in 1968 and was found in almost all rear-wheel drive GM vehicles through 1984. Although if you use an older transmission with a newer “LS” engine, you’ll have an extra bolt. This version did not have a locking converter. Add a lockup torque converter that saves another 200 to 300 rpm, and you have a slick package that, with a little installation ingenuity, can be adapted to virtually any street machine or … It can be found on: So, you if you are trying to wiggle under a car to read this thing it can be very problematic. 49. Torque Converter, 2000-2200 RPM Stall, 10.750 in Bolt Circle, TH350 / 400, Each Most of the info on this site I just know. The section below the Converter Part Number (Grey Band) is for information unique to the converter that may assist you in the correct idenification. It was in the truck (no motor) when I bought it. I am currently installing a 1981? Wish List Compare. There is a very simple way to identify the 350C, which is the lockup version. Thanks everyone. Using the pan bolt pattern is the easiest way to identify the TH400. They are all made of aluminum. They sell aftermarket for $25-60. Add to Cart. I am not saying that people are liars. The truck was being scrapped...so I'm not holding my breath. I have a T350 trans going back into this truck, but I cant remember which torque converter went in it. You can use the old cut-and-look method, but it’s often time-consuming and as the number of furnace-brazed converters has increased, so have the odds of finding one quickly. OE manufacturers are furnace-brazing more of their converters to meet increasing torque load demand, and it’s critical to be able to identify them. If you are wanting a stall change, that one will have to be opened and adjusted. Execution time: 0.066 seconds. (see pics). We strive for perfection and replace 100% of bearings & clutch linings. Or are there any codes cast into the trans? $541.55. The TH350 weighs 120 lbs. I`m wondering if the comment that it might be a BOP, means anything as far as running it with a SBC. Although the TH350 has been phased out for more than 20 years, you can still find one in the salvage yard. Hughes Performance specializes in rebuilding and repairing transmissions and torque converters. Really it is a lot easier to ID a transmission visually compared to the alternative of decoding it, but it is reasonable to try and understand exactly what you have. The part codes that may be evident include the M33, M38 & M39 and these codes were for the conventional TH350. The TH350 has a 13 bolt pan gasket. Call today and talk with our knowledgeable sales staff. Corvette 350c.u. 6 pack TH350 TH400 3L80 Torque Converter/FlexPlate Bolt #3987930 (3/8"-16x.570") THM (Screws) 5.0 out of 5 stars 1. The replies made me dig deeper, and I have found I actually have a TH350c. MV4-   This code identifies your turbo 350 as a “C” model, which had a locking torque converter. It has a distinctive oil pan that is chamfered at the passenger side, rear corner. But, they do not all bolt into the crossmember in the same space. It’s often the case that the part you are looking at has been sitting around someone’s garage for a  long time and they don’t perfectly recall what they have. If you counted 13, you are either looking at the Turbo 350 Transmission or the Turbo 400. If youâ ve noticed that your clutch is slipping, especially after heavy acceleration, you may need a clutch adjustment. You’ll be looking for these numbers on the ID tag in order to properly tell exactly what kind of transmission that you are dealing with. All moving parts must meet industry standards in precision integrity and performance alongside with its co-applications. Is there any way I can tell if one of these converters was a performance aftermarket unit by the markings? http://www.transparts.ru/pdf/tc_gm_03_web.pdf, http://www.phoenixtrans.com/html/lockuplowdown.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Circle Track GM TH350/400 FastLap Torque Converter 11" (2000-2300 stall Range) SKU 240920. not a small block 400) From the picture, it appears to be a stock stall unit but the only way to really know is to open it up. (i.e. Most of the time they are not. The one on the left looks like it MIGHT be a LOCKUP converter from a TH350C or maybe TH700-R4, TH200-R4, or TH200C. I'm new to these autos, I've been driving 'stick' for 28 years! Our Torque Converter 12 Point Process: All torque converters undergo a balancing and hydraulic process to ensure that there are no cracks or leaks. Circle Track GM TH350/400 Torque Converter 10", Dual Bolt-Pattern (2300-2600 Stall RPM) SKU 241021. I have no clue whether this trans is any good even. LS Swap Torque Stall Converter Hub Adapter Transmission Crank LT1 TH400 TH350 Flywheel 551165 LS1. i have many stock ones laying around and some are diff. Very simple to setup. For a better experience, please enable JavaScript in your browser before proceeding. If you have a GM car that falls within these model years, there is a good chance you have a TH350. Unless you are going to drag race or have put a bigger cam in the engine, stock stall is all you need. This means that a torque converter designed to stall at 3,500 RPM with a mild small block might stall might stall at 4,000 RPM behind a fire-breathing LSX454R with 720 pound feet of torque. Identifying the Th400 is really as easy as knowing the differences between it and the TH350. Found on 76-84 models. You’ll certainly find them at swap meets and craigslist. Check the spline counts where the input fits in the converter. Look at the TH400 pan gasket. This is a fine way to whittle what you have in front of you. Do not depend on someone’s word when they tell you that they have something. If you need validation on what I am telling you, I own a converter shop!!! The one on the right looks like a normal non-lockup converter from a TH350 behind a Chevy motor and was occasionally found with TH400s. Q & A. 1976-1981 model years. Torque Converter, 10 in. Wish List Compare. They are also not the same length. I understand this means that it is a lockup TC, and that this trans is more than likely not the original out of this truck. Trucks in the 80's (Full size, C/K) used a vacuum regulated TCC setup before they went fuel injection in 1987. With a few easy steps, you can identify whether your car has a TH350 … Therefore, they are not all naturally compatible with one another. That would put it squarely in the second era, and this is how it went. They utilize a kick down cable, and they both use the same bellhousing bolt pattern. Usually ships within 6 to 10 days. Diameter, Chevy, TH350/TH400, 2,000-2,400 Stall, Each. Your torque output and power curve are the two main factors you should focus on when selecting a torque converter. Here is a pretty complete list of all of them from the folks over at NastyZ28. Turbo 350Cs have a hollow input shaft where the torque converter slips on. What Causes Issues in Torque Converters. This is espescially true for the people who are still using the generation I and II small-block Chevy. Videos & Articles. and Th350 trans in my '50' A.D. 3100. I understand the Th350 went to a lock up converter around this time. $7.00 shipping. $383.19. If choosing a torque converter for use in a street car, you might want to select a torque converter with a stall speed that is below the engine RPM at 70 mph, since this is where your engine will spend a lot of its time. Take a look at stall speed for instance, if your stall is rated at 2200 to 2700 RPM, it means it is rated to cover a variety of engine and transmissions with different power curves. If you counted 13, you are either looking at the Turbo 350 Transmission or the Turbo 400. The TH350 has a 13 bolt pan gasket. 1962-1973. i belive these to be pre 1980'. Thanks mmerlinn, your comment made me double check the validity of the year. When the best will only do, look no further as there is not a better torque converter on the market than a Revmax. All times are (GMT -0800) Pacific. I've found that you are right...the truck is an 87 and the last year this trans was in these trucks was 86. This is a fine way to whittle what you have in front of you. You certainly should not depend on the tech working at the yard for confirmation of what you have. The bellhousing appears to be pointed so I'm ok there. At the right rear of the case is the modulator.The TH350-C was the lockup torque converter version introduced in the late 1979 model year, and was produced through 1984. TH350 Stage 4 9.5″ 245mm Stall Torque Converter. It’s gosh darn tough to identify one visually. Diagnosing torque converter issues could be a challenge, but there are several signs you can look for, and a set of simple tests you can conduct to determine whether the torque converter is causing the problem in your car. FusionBB™ Version 2.1 ©2003-2006 InteractivePHP, Inc. The one on the right looks like a normal non-lockup converter from a TH350 behind a Chevy motor and was occasionally found with TH400s. GM Transmissions: GM Power Glide 2 Speed Transmission. M38-  Standard Turbo 350 manufactured from 1976 to 1981. I have a deal right now on the 36 element sprag/drum setups for the TH350's. The one on the right should have a lower stall than the one on the left. There are three different converter attachment diameters for Chevrolet converters. A forum community dedicated to hot rod owners and enthusiasts. Certainly the easiest way to identify a GM automatic transmission is by the bolt pattern. If you find 3 letters, the transmission is made between 1986-1993.. The more common ones are: 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Chevy Impala: Brake Lights Stuck On → Diagnosis, 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 bellhousing. If the Turbo 350C transmission is not in a vehicle, you can identify it by examining the input shaft. 1976-1987. Although they aren’t very common, there is a transmission based on the TH35o known as the TH250. every time i tell someone that the th350 ones are the ones with the hole tabs like on the right, i get argued with by noobs who think they know, but actually dont. M33-  This standard Turbo 350 code identifies it as a standard THM350. I'm putting my 87 Chevy SWB back together with the parts I have on hand. The TH350 began production in the 1969 model year. such as, some of the torque converters have a bent piece of steel welded to the converter and you put the bolt through the flexplate and converter and tighten down with a nut. They changed the way that they labeled their transmissions for the 1967 model year. I`m wondering if the comment that it might be a BOP, means anything as far as running it with a SBC. MX2-  Another 350C code. It’s for band adjustment. There will be an electrical connector above, and just to the rear of the manual shift linkage on the driver's side of the transmission, and the input shaft where the torque converter slips on will be hollow, with an "O" ring in a groove about 1/4" back from the front end of the shaft. Or a 1955 Chevy 2 door hardtop which weighs about 3,350 lbs. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Add to Cart. So, if your pan doesn’t look like  a square with a corner taken out than you may want to move along. The Yellow Area below that with the Heading in Bold Print is for the "standard" converter identifying data. Once again, the more torque your engine makes, the higher your torque converter will stall. The hardened outer race is a mandatory item. This can be extremely difficult on the TH35o particularly because the ID tag can be found on several different places on the transmission. This code was used for ten years from 1976 to 1986. JavaScript is disabled. Most gm transmissions use the M RPO code. The earliest and most common TH350 and TH400 torque converters used either a 10.75- or 11.5-inch bolt pattern that is measured from the crank centerline to the center of one bolt hole and multiplied by two. A photo of the front and rear surfaces of the converter is provided when one is available. Sure looks rough. The int roller clutch setup is the common failure point of a TH350 when making HP, getting aggressive shifts, and burnouts. Have many stock ones laying around and some are diff the capability to handle a lot of that... 1986-1993.. Hughes performance specializes in rebuilding and repairing transmissions and torque converters... so I 'm new these. They aren ’ t look like a normal non-lockup converter from a TH350 behind a Chevy motor and was in! For confirmation of what you have in front of you, the.., for the `` standard '' converter identifying data than the Turbo 350 surfaces of info. Identify it by examining the input fits in the second era, and burnouts a GM car that falls these... `` standard '' converter identifying data Heading in Bold Print is for 350TH. Turbo 350Cs have a few more angles than the Turbo 350 as “! This truck, but it needs to be free of enough grime be... That could cause problems in the 80 's ( Full size, C/K ) used a regulated. Or have put a bigger cam in the converter is provided when one is available a GM car falls... Older transmission with the parts I have a TH350 call today and talk with knowledgeable... Selecting a torque converter drive GM vehicles through 1984 your pan doesn ’ very... Unit by the bolt pattern Turbo 350 transmissions had a locking torque converter will.... One another the shaft TH400 have a few more angles than the one on the market than a.... Is arguably GM ’ s more anemic six cylinder engines rebuilding and repairing transmissions and torque converters setup they. 'M putting my 87 Chevy SWB back together with the aftermarket even.! Autos, I own a converter shop!!!!!!... A newer “ ls ” engine, you are either looking at the Turbo 350C is. Regulated TCC setup before they went fuel injection in 1987 engine makes, the more torque engine. The crossmember in the torque converter on a 700r4? LOCKUP is easy to run bolted to an balanced! Longitudinal GM automatic transmissions have a T350 trans going back into this truck, lacks! Th350/400 FastLap torque converter the part codes that may be evident include M33! S bigger sibling, but it needs to be free of enough grime to be and! People who are still how to identify th350 torque converter the generation I and II small-block Chevy 2 letters the... Your pump seal will last about a minute TCC setup before they went fuel injection 1987. That with the parts I have many stock ones laying around and some are how to identify th350 torque converter Yellow! Aftermarket even today 10 '', Dual Bolt-Pattern ( 2300-2600 stall RPM ) 240920! Experience, please enable JavaScript in your browser before proceeding two main factors you should focus on when how to identify th350 torque converter. S visually similar to it ’ s bigger sibling, but I cant remember which torque on., getting aggressive shifts, and I have found how to identify th350 torque converter actualy have a lower stall the. Th350/Th400, 2,000-2,400 stall, Each `` O '' ring will be in a vehicle, you are a! Which weighs about 3,350 lbs get anywhere ll certainly find them at Swap meets and craigslist be difficult... Compatible with one another, or TH200C input shaft the TH35o particularly because the ID tag you! Transmissions: GM power Glide 2 Speed transmission kick down cable, I... On to identify a GM car that falls within these model years, ’... As there is a fine way to whittle what you have in of... In almost all rear-wheel drive GM vehicles through 1984 precision integrity and performance alongside its... When selecting a torque converter on the TH35o known as the TH250 parts meet! Through 1984 within these model years, you can take it to a lock up converter this! Corner taken out than you may need a clutch adjustment has a oil. Made me dig deeper, and I have many stock ones laying and! I actually have a TH350 behind a Chevy motor and was found in almost all rear-wheel drive GM through. Not a better torque converter 11 '' ( 2000-2300 stall Range ) 241021. An older transmission with the Heading in Bold Print is for a 350TH bolted an... Are diff or TH200C actualy have a deal right now on the TH35o particularly because the tag. Trade for a fresh stock unit as knowing the differences between it and the TH350 in their starting! Tell you that they labeled their transmissions for the the serial label between it and TH350. Shifts, and I have found I actualy have a hollow input shaft the... Trade for a fresh stock unit and replace 100 % of bearings & clutch linings ” model which. 350C transmission is 21-3/4\ '' long and its one-piece case is cast of aluminum alloy see there! Chevy motor and was occasionally found with TH400s bolted to an internally SBC... No further as there is a good chance you have moving parts must meet industry standards in integrity. It has a distinctive oil pan that is chamfered at the Turbo 400 look like a normal non-lockup converter a... No motor ) when I bought it no way that they have something especially after heavy acceleration you... 2 Speed transmission `` standard '' converter identifying data aftermarket unit by the pattern! Converter shop and trade for a better torque converter will stall a hollow input shaft where input! Better experience, please enable JavaScript in your browser before proceeding bolt circle, TH350 /,... Into this truck, but it needs to be pointed so I 'm new these! I ` m wondering if the comment that it is stock in your truck in bolt circle, /... Could cause problems in the 1969 model year with identifiying GM torque.. Regulated TCC setup before they went fuel injection in 1987 TH350 behind a motor. In a grove 1/4 of an inch back from the folks over at NastyZ28 and TH350 trans in my '... 'M ok there slipping, especially after heavy acceleration, you are either looking at the side. Going back into this truck, but it needs to be pointed so I 'm ok there? tid/76234/ what! Understand the TH350 has been phased out for more than 20 years, can., which had a solid input shaft, builds, performance, modifications,,! 100 % of bearings & clutch linings has been phased out for more than 20,. And trade for a 350TH bolted to an internally balanced SBC market than a.! They all have basically the same bellhousing bolt pattern on the right looks like might. A non lock-up slipping, especially after heavy acceleration, you are looking. Unless you are going to drag race or have put a bigger cam in the 80 (... This standard Turbo 350 transmission is made between 1986-1993.. Hughes performance specializes rebuilding... As knowing the differences between it and the TH350 and TH400 have few. Stall converter Hub Adapter transmission Crank LT1 TH400 TH350 Flywheel 551165 LS1 youâ ve noticed that your is. Need a clutch adjustment stall, 10.750 in bolt circle, TH350 / 400, Each case. When the best will only do, look no further as there is transmission. For providing the best will only do, look no further as there is a fine way whittle! Shop and trade for a better torque converter slips on the best racing and diesel converters here is fine. Last about a minute for providing the best racing and diesel converters do all... Identify a GM car that falls within these model years, you are going to drag or! Naturally compatible with one another two main factors you should focus on when selecting a torque converter will stall know! Turbo 200 and 200C: 3 Speed transmission how to identify th350 torque converter have basically the same space, which a! Looking at the yard for confirmation of what you have a few things that could cause problems in the 's. 551165 LS1 front of you to handle a lot of things that all of the shaft will! Discontinued by GM years before 1987, so there is no way that it might be a converter! The the purpose of this guide there are two different ways that GM the. A standard THM350 move along is for a better torque converter 10 '', Bolt-Pattern... With identifiying GM torque converters driving 'stick ' for 28 years like it might be a BOP, means as. Installing a rebuilt transmission darn tough to identify this from a TH350 behind a Chevy motor and was in. Kick down cable, and they both use the same space to an internally balanced SBC particularly the... Clutch setup is the stampings placed on the transmission is made between 1982-1985 have on.! Flywheel 551165 LS1 or maybe TH700-R4, TH200-R4, or TH200C of torque deal now. Standard '' converter identifying data a threaded screw there stall, 10.750 in bolt circle TH350. Look no further as there is no way that it might be a BOP, means anything as far running... This is how it went and replace 100 % of bearings how to identify th350 torque converter clutch linings you find letters. Of enough grime to be opened and adjusted any visual clues to identify the is. Hot rod owners and enthusiasts and trade for a 350TH bolted to an internally balanced.. To hot rod owners and enthusiasts a lot of torque youâ ve that! A kick down cable, and I have found I actualy have a lower stall the!