Fitment question - C10 rotors on a C20 front end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Asshat · 03-01-2021, 04:26 PM

I have a complete cross smember from a 74 C20, and I was wondering if there is any way to install the 5 or 6 lug C10 rotors on the C20 front end?

The only reason I would want to do this, is if I were to install a 3:08 rear end on my 63 C20. Pretty sure there are no C20 rear ends that are geared that high, so, if I wanted to do this it would require a rear end from a C10 or other vehicle.

**cwcarpenter98** · 03-01-2021, 08:17 PM

At that point, you're probably better off going with a c10 front cross member. I don't know of a way to put the c10 rotors on the c20 spindles

Asshat · 03-01-2021, 09:04 PM

Quote:

Originally Posted by cwcarpenter98

At that point, you're probably better off going with a c10 front cross member. I don't know of a way to put the c10 rotors on the c20 spindles

Well, I don't think I will come across a deal on a C10 front end like I did with the one I got. Was just hoping that IF I did go with a 5-lug rear end, I could change the front easily.

Oh well... I guess I will stay with 8 lugs. Now I will need to find a T5 trans!

LostMy65 · 03-01-2021, 10:59 PM

A 73-87 c10 complete front crossmember should be found for $50 without much effort.

Asshat · 03-01-2021, 11:12 PM

Quote:

Originally Posted by LostMy65

A 73-87 c10 complete front crossmember should be found for $50 without much effort.

Not in California! Anything out here that is related to classic cars or trucks is always over-priced, especially by private parties.
I would love to find one for $50!

SCOTI · 03-02-2021, 10:33 AM

The x-members are interchangeable. The difference is in the arms & supporting pieces that attach. The upper a-arm shaft will require the correct shaft for the x-member (for the correct sizing).

I have a 1/2 ton x-member under my R30 dually. I simply used the C30 bracing & the C30 dually arms + steering parts.

But.... The tire size makes a difference on final drive rpms. What size tires? 3.54 gearing might be possible on the HD 8-lug stuff & would be close to the desired 3.08 (which I feel would not be a good choice for a heavy truck).

**kwmech** · 03-02-2021, 11:50 AM

Upper arms are the same it is the ball joint that is different. The upper bj bolts in. Lower arm is different b'cuz of the hole for the 3/4t Ball Joint that presses in. And of course the spindle itself is different due to the wheel bearing size.

**kwmech** · 03-02-2021, 11:56 AM

Quote:

Originally Posted by Asshat

Not in California! Anything out here that is related to classic cars or trucks is always over-priced, especially by private parties.
I would love to find one for $50!

OR it is all being scooped up and sold for scrap due to the 'environmental nazis' making the wrecking yards be as clean as hospitals. Everything has to under a roof and everything in the yard concreted. When the steel prices were up about 8-10 years ago there was an unprecedented amount of yard clean up. Everything was crushed and sent to china--didn't matter what it was. It was an opportunity to clean the yard AND clean up money wise at the same time----A LOT of good stuff was eliminated forever

03-01-2021, 04:26 PM	#1
Asshat Registered User Join Date: Jul 2015 Location: South Orange County CA Posts: 1,265	Fitment question - C10 rotors on a C20 front end I have a complete cross smember from a 74 C20, and I was wondering if there is any way to install the 5 or 6 lug C10 rotors on the C20 front end? The only reason I would want to do this, is if I were to install a 3:08 rear end on my 63 C20. Pretty sure there are no C20 rear ends that are geared that high, so, if I wanted to do this it would require a rear end from a C10 or other vehicle. __________________ 1963 C20, small window, long bed 292, 4-speed

03-01-2021, 08:17 PM	#2
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,491	Re: Fitment question - C10 rotors on a C20 front end At that point, you're probably better off going with a c10 front cross member. I don't know of a way to put the c10 rotors on the c20 spindles __________________ Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson

03-01-2021, 10:59 PM	#4
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Fitment question - C10 rotors on a C20 front end A 73-87 c10 complete front crossmember should be found for $50 without much effort. __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

03-02-2021, 10:33 AM	#6
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: Fitment question - C10 rotors on a C20 front end The x-members are interchangeable. The difference is in the arms & supporting pieces that attach. The upper a-arm shaft will require the correct shaft for the x-member (for the correct sizing). I have a 1/2 ton x-member under my R30 dually. I simply used the C30 bracing & the C30 dually arms + steering parts. But.... The tire size makes a difference on final drive rpms. What size tires? 3.54 gearing might be possible on the HD 8-lug stuff & would be close to the desired 3.08 (which I feel would not be a good choice for a heavy truck). __________________ 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.*

03-02-2021, 11:50 AM	#7
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,635	Re: Fitment question - C10 rotors on a C20 front end Upper arms are the same it is the ball joint that is different. The upper bj bolts in. Lower arm is different b'cuz of the hole for the 3/4t Ball Joint that presses in. And of course the spindle itself is different due to the wheel bearing size.

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