73-87 Chevy _ GMC Trucks > 4 Wheel Drives

Transmission and transfer case ???

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BradRuiz 83:
does anyone know what kind of transmission and transfer case a 1980 k10 4x4 chevy came out with... anything helps

Shifty:
Probably a TH350, possibly a TH400, and it should be a New Process 205 transfer case.

SilverMiner:

--- Quote from: BradRuiz 83 on November 18, 2019, 10:21:39 AM ---does anyone know what kind of transmission and transfer case a 1980 k10 4x4 chevy came out with... anything helps

--- End quote ---

When it comes to 1980, the General made the transfer case mystery easy: <Oprah Voice> You get an NP205, you get an NP205, and YOU get an NP205! </Oprah Voice>. The 203 full time was forbidden, and everybody got the best transfer case.

But when it comes to the trans, things get more dicey. I just looked up things on the https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html which is an invaluable resource, but I forgot all the 3-speed autos got the MX1 RPO. To the best of my knowledge, no 1/2 ton 10-series trucks in 1980 got the desirable TH400 because previously (74 to 77? not sure) the TH400 was only attached to the big block 454 in 2wd which was not available in 80. I'd bet money if your K10 is 100% original it has the much maligned TH350C and not a standard TH350 because that's the only transmission offered from the dealer.

BUT...  But.... what are the odds your nearly 40 year old vehicle is still stock? How many previous owners have made modifications? What you need to do is crawl under the rig and take a good look at the pan and compare its shape to the many trans identifying images here on the internet. The shape of the pan will tell you conclusively whether or not it is a 400 or 350, but to identify if it is a 350C look for an electrical connection on the driver's side just above the mid-pan point.

You can Google what issues the TH350C was famous for, but don't despair. If it has made it this long, you're probably fine.

Good luck!

JohnnyPopper:
Post pics of both the trans and NP and you will get the answers you seek...!

Shifty:
BTW: A TH350 will be square with a corner cut off at an angle, whereas a TH400 is (roughly) Texas-shaped.

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