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Old 01-10-2018, 09:20 PM   #1
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Join Date: Jun 2013
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C series suspension/engine crossmember questions

I'm trying to find out what C series front suspension/engine crossmembers will interchange, all I'm wanting to know about is the crossmember none of the suspension components. Are they the same from a c10, c20, or c30?

I maybe swapping a 69 c10 over to disc brakes and I have everything from the controls arms out from a 78 c10 that is in good shape. Just trying to find out what crossmembers from 73-87 are the same or what I need to look for when I go to buy one. I used the 78 crossmember I had replacing the rusted one in my 86 GMC.
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Old 01-11-2018, 11:11 AM   #2
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Re: C series suspension/engine crossmember questions

Upper a-arm studs are larger on C20's/30's.
73-87 x-members might require a couple of holes to be opened up/re-drilled when used on pre 73 chassis.
Motor mount stands can/do vary in height between 6x-72's & 73-87's.
Brake line mounting tabs are in different locations.
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