![]() Near where the shift linkage attaches to the body.This can be extremely difficult on the TH35o particularly because the ID tag can be found on several different places on the transmission. You’ll need to find the ID tag before you get anywhere. That would put it squarely in the second era, and this is how it went. ![]() The TH350 began production in the 1969 model year. They changed the way that they labeled their transmissions for the 1967 model year. ![]() Now, for the the purpose of this guide there are two different ways that GM printed the the serial label. 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. In this particular case I found that right here: Most of the info on this site I just know. You’ll need to look above the coolant line fittings to see if there is a threaded screw there. It’s gosh darn tough to identify one visually. GM often bolted it behind it’s more anemic six cylinder engines. It’s visually similar to it’s bigger sibling, but lacks the capability to handle a lot of torque. So, if your pan doesn’t look like a square with a corner taken out than you may want to move along.Īlthough they aren’t very common, there is a transmission based on the TH35o known as the TH250. You’ll also notice that the pan on the turbo 400 has quite a few more angles than the turbo 350. You can see how different it is compared with the TH350. If you counted 13, you are either looking at the Turbo 350 Transmission or the Turbo 400. This is a fine way to whittle what you have in front of you. Therefore, they are not all naturally compatible with one another.Ĭertainly the easiest way to identify a GM automatic transmission is by the bolt pattern. But, they do not all bolt into the crossmember in the same space. Although if you use an older transmission with a newer “LS” engine, you’ll have an extra bolt. They all have basically the same bolt pattern on the bellhousing. There are a few things that all of the longitudinal gm automatic transmissions have in common. 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. Do not depend on someone’s word when they tell you that they have something. You’ll certainly find them at swap meets and craigslist. You certainly should not depend on the tech working at the yard for confirmation of what you have. This is espescially true for the people who are still using the generation I and II small-block Chevy.Īlthough the TH350 has been phased out for more than 20 years, you can still find one in the salvage yard. The Turbo 350 is arguably GM’s most popular automatic transmission with the aftermarket even today. Nearly all of the GM automatic transmissions have a few things in common.
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