C series suspension/engine crossmember questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

flatbed82 · 01-10-2018, 09:20 PM

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.

SCOTI · 01-11-2018, 11:11 AM

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.

01-10-2018, 09:20 PM	#1
flatbed82 Registered User Join Date: Jun 2013 Location: Marthasville, MO Posts: 23	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.

01-11-2018, 11:11 AM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,071	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. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*



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