12/15/2023 0 Comments 4x4 turbo 350 transmission for sale![]() The 4x4 application has two supporting arms that marry to the bottom of the dust cover, the other ends bolt to the engine either side, below the motor mounts, for added support. This is the heart of the matter I need to answer as it will help me make a buying decision. The matter is not whether I can use the 2wd case for a 4x4 application, the matter is whether or not a th350 case for a 4x4 application is different, and if so, in what way. Can anybody out there verify this information. They all appear to be cases with four small bolt ups for a tin dust cover, which I am told is a dead give away that the case came off a 2wd application. I am told this a more desirable transmission as the case is thicker and the 32 spline is more desired over the 27. This is not a 700 and it has the K marking. I ran across a transmission with "K" markings, modulator sticks out the back like all TH350s, has a 32 spline and it has six large opening bolt holes to recieve the dust cover. Is there a definitive answer to this question ? Is there such a thing as a true 4x4 case ? does the main body of all 4x4 cases look like the main body of a 2wd ? do the bolt holes at the converter cover a dead giveaway ? inquiring minds want to know. How does a guy know if a transmission is a true 4x4 or simply a reused 2wd case ? Is this the TRUE 4x4 case I seek ? I know that this case is thicker. I did see one "K" case - It look just like the 350 case I have and had a K in large letter, top right of case bell housing. How the heck does a guy know ? I've seen hundreds of pictures on google that show guys proudly showing off their rebuilt turbo 350 transmission for 4x4 application - no tail, shaft sticks out 1" past housing - and the bolt holes for the torque cover are small bolt holes. The small tapped hole probably recieves a 3/16 or 1/4 bolt, the large receives something close to a 3/8 inch bolt. I am being told by a GM tech who has long time experience with transmissions that in order to be a true 4x4 transmission case, their should be large bolt holes in the case to receive the torque convertor cover. ![]() The transmission originally had small bolt holes to receive a tin cover plate, three of them were drilled out to accept a larger bolt which was required to marry the torque cover plate. The cover which allows access to the torque converter, has large holes and the cover has two places on the bottom where to mount support brackets that come from the engine. The tail shaft is 27 spline and the np203 married up with stock transmission adapter/support mounting plate. I pulled the transmission to get it rebuilt, but the shop tells me that I have a 2wd auto trans case doing duty as a 4x4 auto case. I am new to the 4x4 thing and I purchased a 1978 GMC 4x4 1/2 ton, with a turbo 350 automatic transmission with NP203, from an estate auction, I got it running and it does not move, I dropped the pan and there are metal frags in the bottom.
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