C10 vs c20 front crossmembers are they the same? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dragn91 · 04-28-2016, 07:23 AM

I want to section a crossmember for my c20 so I have it ready for when I swap the engine in a couple months. I can't find a definitive answer on if the c10 crossmembers are the same as a c20. I have access to a lot more c10 parts than c20. Anyone know for sure? I know the c20 uses larger u bolts on the lower arms but can I just drill those larger?

SCOTI · 04-28-2016, 09:49 AM

Lower shaft u-bolts aren't different. The upper shaft studs are 9/16" for C20/30 & 1/2" for C10's. The x-members will interchange but will require using the correct upper arms for the specific x-member.

dragn91 · 04-28-2016, 12:10 PM

Can i just drill them out and run grade 8 bolts and put the 3/4 ton arms on when I swap them?

SCOTI · 04-28-2016, 01:05 PM

Quote:

Originally Posted by dragn91

Can i just drill them out and run grade 8 bolts and put the 3/4 ton arms on when I swap them?

Yep.

04-28-2016, 07:23 AM	#1
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	C10 vs c20 front crossmembers are they the same? I want to section a crossmember for my c20 so I have it ready for when I swap the engine in a couple months. I can't find a definitive answer on if the c10 crossmembers are the same as a c20. I have access to a lot more c10 parts than c20. Anyone know for sure? I know the c20 uses larger u bolts on the lower arms but can I just drill those larger?

04-28-2016, 09:49 AM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: C10 vs c20 front crossmembers are they the same? Lower shaft u-bolts aren't different. The upper shaft studs are 9/16" for C20/30 & 1/2" for C10's. The x-members will interchange but will require using the correct upper arms for the specific x-member. __________________ 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.*

04-28-2016, 12:10 PM	#3
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: C10 vs c20 front crossmembers are they the same? Can i just drill them out and run grade 8 bolts and put the 3/4 ton arms on when I swap them?



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