Couple rearend swap questions/brakes etc - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**grumpy** · 03-02-2011, 02:38 PM

I have a 72 12-bolt 3.08 rear to swap into my 66 short fleet.
I know the 72 is 3/4" wider on each side, which is fine.

I dont have any backing plates or brakes on the 72 rear. Will the backing plates and brakes work from the 66 rear?

Also, I ordered a bolt-in cnotch from cpp, and their super trac-bar. I was going to order the 1 1/2 or 2" drop block/ubolt kit, but 70 bucks plus shp seems extreme.
I can make steel blocks for zero, and just need Ubolts. So anyone know where to buy reasonable Ubolts, or can anyone give me measurements so I can have them made local??

Thanks fella's

Heater63 · 03-02-2011, 03:06 PM

Ubolts -I've seen this solved here on this board, so search the archives.
I would also try a tractor supply, big truck shop, or maybe online like stengelbros or fastenal or McMaster-Carr
Posted via Mobile Device

SFTorange · 03-02-2011, 03:15 PM

Your brake backing plates will work just fine. I believe truck 12 bolt backing plates will fit from any year. I just completed the swap to the HD 11 5/32 X 2-3/4 brakes by swapping backing plates from a late 70's K-10.

**grumpy** · 03-04-2011, 02:03 PM

Thanks guys.

I know the axle housing is 3", but anyone know how long I should make them to use a 2" block? 11" ?

Also, since my truck is buried and I cant get to it, and Im having a brain fart, what size thread are the ubolts for trailing arm rearends? So I can tell the shop Im having make them. I know theyre alot more stout than a typical ubolt.

SCOTI · 03-04-2011, 05:01 PM

Quote:

Originally Posted by **grumpy**

Thanks guys.

I know the axle housing is 3", but anyone know how long I should make them to use a 2" block? 11" ?

Also, since my truck is buried and I cant get to it, and Im having a brain fart, what size thread are the ubolts for trailing arm rearends? So I can tell the shop Im having make them. I know theyre alot more stout than a typical ubolt.

I took a stock one w/me to a local spring shop & told them I need some 2" longer. He measured & bent me some new one's. I believe they're 3/4" diameter.

**Clyde65** · 03-04-2011, 03:05 PM

here are some from CPP, extended length. you might ask Jeff from CPP and see how long they are.

http://www.classicperform.com/Store/...k/6072RUBS.htm

03-02-2011, 02:38 PM	#1
grumpy Registered User Join Date: Feb 2007 Location: NE Ohio Posts: 737	Couple rearend swap questions/brakes etc I have a 72 12-bolt 3.08 rear to swap into my 66 short fleet. I know the 72 is 3/4" wider on each side, which is fine. I dont have any backing plates or brakes on the 72 rear. Will the backing plates and brakes work from the 66 rear? Also, I ordered a bolt-in cnotch from cpp, and their super trac-bar. I was going to order the 1 1/2 or 2" drop block/ubolt kit, but 70 bucks plus shp seems extreme. I can make steel blocks for zero, and just need Ubolts. So anyone know where to buy reasonable Ubolts, or can anyone give me measurements so I can have them made local?? Thanks fella's __________________ Tim Road Hounds

03-02-2011, 03:06 PM	#2
Heater63 Registered User Join Date: Dec 2007 Location: N Texas Posts: 580	Re: Couple rearend swap questions/brakes etc Ubolts -I've seen this solved here on this board, so search the archives. I would also try a tractor supply, big truck shop, or maybe online like stengelbros or fastenal or McMaster-Carr Posted via Mobile Device __________________ 292 + TKO500

03-02-2011, 03:15 PM	#3
SFTorange Registered User Join Date: Apr 2010 Location: Billings, MT Posts: 417	Re: Couple rearend swap questions/brakes etc Your brake backing plates will work just fine. I believe truck 12 bolt backing plates will fit from any year. I just completed the swap to the HD 11 5/32 X 2-3/4 brakes by swapping backing plates from a late 70's K-10. Last edited by SFTorange; 03-02-2011 at 03:15 PM.

03-04-2011, 02:03 PM	#4
grumpy Registered User Join Date: Feb 2007 Location: NE Ohio Posts: 737	Re: Couple rearend swap questions/brakes etc Thanks guys. I know the axle housing is 3", but anyone know how long I should make them to use a 2" block? 11" ? Also, since my truck is buried and I cant get to it, and Im having a brain fart, what size thread are the ubolts for trailing arm rearends? So I can tell the shop Im having make them. I know theyre alot more stout than a typical ubolt. __________________ Tim Road Hounds

03-04-2011, 03:05 PM	#6
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Couple rearend swap questions/brakes etc here are some from CPP, extended length. you might ask Jeff from CPP and see how long they are. http://www.classicperform.com/Store/...k/6072RUBS.htm __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

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