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#1 |
Senior Member
![]() Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Transmission Mount spacer ?
I’m replacing a turbo 350 with a turbo 400 in one of my trucks and I’m wondering if the spacer that was with the transmission is needed. It’s about a quarter inch tall. Was that for use with the big block trucks only or haul trucks equipped with a turbo 400? I believe it goes between the mount and the transmission. My truck is a small block. Thanks.
Last edited by uncle; 02-20-2023 at 09:29 PM. |
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#2 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,432
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Re: Transmission Mount spacer ?
You will need to measure your driveline angles to determine if you still need the shim.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#3 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 758
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Re: Transmission Mount spacer ?
OP, before you remove your TH350, measure from floor to center of tail shaft spline. Do this once truck is raised to work on so when you get the 400 in, make the same measurement. You want it to be the same as the TH350 measurement so if you need to add the shim back, delete it or use a different thickness, do so to maintain your DL angle.
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#4 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,251
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Re: Transmission Mount spacer ?
I never figured out when GM used the shim and when they didn't.
If someone knows I would find it interesting. |
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#5 | |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 758
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Re: Transmission Mount spacer ?
Quote:
For after the fact, people use them more when truck is lowered so adding trans shim and or pinon angled shim is needed to correct DL angle. Typically the shims for trans are 1/8" thick and 1 or 2 are used as needed. I have a 96 that has 2. I don't recall seeing any on my 72 C10 Saginaw 3 speed |
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#6 |
Senior Member
![]() Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Re: Transmission Mount spacer ?
Thanks for the input.
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