Couple rearend swap questions/brakes etc

[**grumpy**]

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]

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
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[SFTorange]

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**]

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.

[Clyde65]

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

[SCOTI]

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.