c-20 crossmember change - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rlm316 · 11-09-2006, 10:27 AM

I am going to change out the crossmember on my 70' C20 with a unit from a 91 suburban and I was wondering if there any issues that I will need to address other than the holes on the side of the frame rails? The main reason for the change is the addition of disc brakes. Thanks for any info that you can offer.

Aarons72s · 11-10-2006, 12:25 AM

Im pretty sure just a couple of bolt holes but here is a bump for you. I know there are a few that have done this and can give the complete low down.
Aaron

rlm316 · 11-13-2006, 09:40 AM

Thanks, I was wondering about the idler arm and the pitman arm plus the shock allignment from the 70' to the 91'. Which brake lines and mastercylinder/booster to use? Any help on this would be great.
Lane

rlm316 · 11-20-2006, 08:33 AM

ttt

qksilver · 11-20-2006, 07:04 PM

The only real benifit to changing the crossmember is easier access to the oil pan. All the suspension parts of the 91 will bolt up to your current crossmember. I have done it both ways and it is a lot easier to reuse the orginal crossmember and faster. Especially if your 70 has the engine in it.

11-09-2006, 10:27 AM	#1
rlm316 Registered User Join Date: Aug 2006 Location: Woodstown, NJ Posts: 669	c-20 crossmember change I am going to change out the crossmember on my 70' C20 with a unit from a 91 suburban and I was wondering if there any issues that I will need to address other than the holes on the side of the frame rails? The main reason for the change is the addition of disc brakes. Thanks for any info that you can offer.

11-10-2006, 12:25 AM	#2
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,669	Re: c-20 crossmember change Im pretty sure just a couple of bolt holes but here is a bump for you. I know there are a few that have done this and can give the complete low down. Aaron

11-13-2006, 09:40 AM	#3
rlm316 Registered User Join Date: Aug 2006 Location: Woodstown, NJ Posts: 669	Re: c-20 crossmember change Thanks, I was wondering about the idler arm and the pitman arm plus the shock allignment from the 70' to the 91'. Which brake lines and mastercylinder/booster to use? Any help on this would be great. Lane

11-20-2006, 08:33 AM	#4
rlm316 Registered User Join Date: Aug 2006 Location: Woodstown, NJ Posts: 669	Re: c-20 crossmember change ttt

11-20-2006, 07:04 PM	#5
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: c-20 crossmember change The only real benifit to changing the crossmember is easier access to the oil pan. All the suspension parts of the 91 will bolt up to your current crossmember. I have done it both ways and it is a lot easier to reuse the orginal crossmember and faster. Especially if your 70 has the engine in it.

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