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Old 02-19-2012, 06:05 PM   #1
Bryan H
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Question Did A Shim Come Factory Under The Automatic Trans Mount?

I have a 71 C-10 I'm converting to an automatic with a 350 turbo. Did a factory shim come under the mount? I bought a crossmember from a guy and he gave it to me with the crossmember. It is retangular shaped and has the 2 slots for the bolts an its about 1/8" thick. It looks to me like a factory stamp piece and not made by a person. I didn't know if these trucks come factory with this or not. Any Ideas?

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Old 02-19-2012, 06:53 PM   #2
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

Hey Bryan,
My 1970 did....
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Old 02-19-2012, 07:25 PM   #3
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

Mine too...
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Old 02-19-2012, 08:15 PM   #4
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

Interesting, I have probably disassembled 10 or more of these trucks and never come across a shim there. Learn something new everyday on this site
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Old 02-19-2012, 08:24 PM   #5
Bryan H
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

The one I have is shaped different. I can see the image on the crossmember where it was. It went between the mount and crossmember instead of the transmission and mount like the one pictured.
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Old 02-19-2012, 08:28 PM   #6
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

My 68,C-10 has one between the trans and rubber mount.
It's a t-400.
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Old 02-20-2012, 09:54 AM   #7
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

Anybody know WHY they were used?
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Old 02-20-2012, 12:21 PM   #8
JimKshortstep4x4
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

I have used shims to change the driveshaft angle before so I assume that they were used to correct the driveshaft angle when necessary.

Jim
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Old 02-20-2012, 01:30 PM   #9
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

My 70 also has one. It was there when I pulled the Trans for rebuild so I put it back.
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Old 02-20-2012, 02:44 PM   #10
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Re: Did A Shim Come Factory Under The Automatic Trans Mount?

There's one in my 69 also. It's between the trans and the mount. The truck is a C20 with a 350 and TH400. It's original to the truck.
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