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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: unbludictable on March 13, 2008, 03:37:01 pm

Title: th350 to th400
Post by: unbludictable on March 13, 2008, 03:37:01 pm

I got a '76 GMC w/350 engine. The th350 went bad, should I....
     A) Put in the rebuilt th400 that I have and buy the universal conversion kit?

   or

    B) Buy a rebuilt th350 and keep on kicking?

I got the money for both, but I was told that the th350 works harder or just as hard as the th400? Is this true?
What harm would it do to put the th400 in?

Title: Re: th350 to th400
Post by: VileZambonie on March 13, 2008, 05:26:05 pm

There's no harm in putting in the TH400 it's just a more heavy duty transmission. If you take care of a TH400 it will never let you down.

Title: Re: th350 to th400
Post by: unbludictable on March 14, 2008, 08:41:17 am

Thanks!

 

Title: Re: th350 to th400
Post by: unbludictable on March 14, 2008, 10:23:18 am

I forgot to mention that my th350 is a long tail, but the th400 is short tail.

Does this pose a major problem? or Can I just buy the conversion u-joint that was suggested on this site?

Title: Re: th350 to th400
Post by: VileZambonie on March 14, 2008, 12:51:23 pm

If you're installing a shorter tail from say 9" in length difference you have to make up for it. That means longer driveshaft.