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)

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.