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Old 12-11-2019, 12:34 AM   #1
Mike1965
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Factory or Homemade?

I noticed while I taking apart the frame of my '65 C20, that the trailing arms have plates welded to the bottom and top of them. I am wondering if these plates were added for the 3/4 ton trailing arm trucks from the factory or did a PO add these to the truck?
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Old 12-11-2019, 07:26 AM   #2
PGSigns
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Re: Factory or Homemade?

I think my 66 C20 had em. Still not sure of the origin of the plates.
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Old 12-11-2019, 10:22 AM   #3
jayoldschool
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Re: Factory or Homemade?

Factory plates on C20 and up.
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Old 12-11-2019, 06:39 PM   #4
Clyde65
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Re: Factory or Homemade?

Stiffening plates for the 3/4 ton, idk if factory tho
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Old 12-11-2019, 11:02 PM   #5
Captainfab
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Re: Factory or Homemade?

All C20's that I have seen had those from the factory to stiffen up the trailing arms. They also have a brace from the front of the trailing arm crossmember over to the frame rail, that is not present on a C10
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Old 12-12-2019, 12:01 AM   #6
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Re: Factory or Homemade?

Would these reinforcements be something worthwhile on a regular C10?
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Old 12-12-2019, 10:01 AM   #7
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Re: Factory or Homemade?

3881314 is the GM part number. C20 from 1960-1972 . Will also work on C10 as this is the later replacement part that was used to repair C10s




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