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Can I change out the overdrive tranny for a 350 or 400 turbo tranny

Tiny
SCOTT CARVER
  • MEMBER
  • 1988 GMC SIERRA
  • 30,000 MILES
I have an 88 GMC Serra 4x4 with 350, overdrive tranny. I am noticing a hard shift between 2nd and 3rd and not much power. I am wondering if I can change the overdrive tranny out for a 350 or 400 turbo tranny and if I can do I have to change out the transfer case.
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Thursday, July 26th, 2012 AT 4:37 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Would you be going to 2 wheel drive or staying in 4 wheel?

Roy
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Thursday, July 26th, 2012 AT 4:43 PM
Tiny
SCOTT CARVER
  • MEMBER
  • 2 POSTS
Staying 4x4 just want better performance and towing power.
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Thursday, July 26th, 2012 AT 5:46 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
350 trans works well and geared well. Not sure if the tranfer case will work I know the new process cases work well with the 350. You may have to get diferent driveshafts but you wil know when you fit them up there.

It is not a direct fit. You will have mix and match some parts to get where you want.

Roy
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Thursday, July 26th, 2012 AT 6:25 PM

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