Rear end swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WB72 · 08-14-2002, 04:39 PM

I'm not sure of the name of the rear end that I have, but it has no access to the gears from the rear of the truck, you get to the gears from the front side. Anyhow, would I be able to swap it for a 10 or 12 bolt unit? A guy I know has a 3.73 12 bolt that came from a 74 C10, he would let me have for $80.00 CAD. Would this be advisable?

My truck is a 72 C20 350/350 with 350 hp.

WB72 · 08-15-2002, 10:06 AM

ttt!

palallin · 08-15-2002, 12:37 PM

The 12-bolt is a VERY good rear end, but it's a half-ton; you have a 3/4-ton truck. Not only will the wheel bolt patterns not match, you'll loose capacity and ride height. Spring mounts may be different--I don't know--and in different places.

What little I can say without seeing pics/knowing more.

stllookn · 08-15-2002, 12:51 PM

If yours has access from the front only it should be a 12 1/4 inch ring gear rear end which is much stronger. I think these came in 7500 lb and 11000 lb capacity. You will not have to worry about breaking it with your typical street engine setup.

08-14-2002, 04:39 PM	#1
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	Rear end swap I'm not sure of the name of the rear end that I have, but it has no access to the gears from the rear of the truck, you get to the gears from the front side. Anyhow, would I be able to swap it for a 10 or 12 bolt unit? A guy I know has a 3.73 12 bolt that came from a 74 C10, he would let me have for $80.00 CAD. Would this be advisable? My truck is a 72 C20 350/350 with 350 hp. __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

08-15-2002, 10:06 AM	#2
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	please... ttt! __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

08-15-2002, 12:37 PM	#3
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	The 12-bolt is a VERY good rear end, but it's a half-ton; you have a 3/4-ton truck. Not only will the wheel bolt patterns not match, you'll loose capacity and ride height. Spring mounts may be different--I don't know--and in different places. What little I can say without seeing pics/knowing more. __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

08-15-2002, 12:51 PM	#4
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	If yours has access from the front only it should be a 12 1/4 inch ring gear rear end which is much stronger. I think these came in 7500 lb and 11000 lb capacity. You will not have to worry about breaking it with your typical street engine setup. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)



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