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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: klaussk on May 18, 2012, 08:41:04 am

Title: TH400 swap
Post by: klaussk on May 18, 2012, 08:41:04 am

I have a 78 TH400 out of a 2 wheel drive RV. It appears to have been rebuilt recently and it came with the rebuilt 400 I purchased. I am wondering if it is possible to install this transmission in my 85 K10. its a 4 wheel drive stepside shortbed and originaly had a  700R4 in it . Can I take the tailhousing  off the TH400 and install the transfer case. Thank you

Title: Re: TH400 swap
Post by: slammed79 on May 18, 2012, 09:33:40 am

I could be wrong, but that kinda conversion is more trouble than its worth. You'd probably do better to sell both transmissions and buy a 4x4 th400.

Title: Re: TH400 swap
Post by: klaussk on May 18, 2012, 02:41:03 pm

How strong do you think a TH400 is.

Title: Re: TH400 swap
Post by: slammed79 on May 18, 2012, 05:03:54 pm

I've only ever had one go out on me. Tough trans. If the truck is a dd I'd keep the 700r4, a little nicer to the wallet.

Title: Re: TH400 swap
Post by: Captkaos on May 21, 2012, 12:07:40 pm

The output shaft length is different on the 4x4 vs 4x2, to swap it you have to take it apart completely.

Title: Re: TH400 swap
Post by: klaussk on May 22, 2012, 01:04:54 pm

I think it would be easier to just find a rebuilt tranny or rebuild mine. I'm not to sure about my ability to rebuild a  transmission in the time I will have to rebuild it.