12 bolt Rear End Info
 

Is there any reason a 1965 GMC 3:73 12 bolt with leaf springs rear end not work on my 66? I currently have a 10 bolt and understand the 12 bolt is a good upgrade even if its not posi.
Appreciate the info.

Re: 12 bolt Rear End Info
 

66 with a 10 bolt?

66’s has 12 bolts stock. Mounts would be the only consideration.

Re: 12 bolt Rear End Info
 

A 65 GMC 12 bolt will be exactly the same as a '64-'70 Chevy 12 bolt aside from having leaf spring mounts as opposed to trailing arm mounts. I do make the trailing arm mounts if you end up needing a set.

Re: 12 bolt Rear End Info
 

great thanks, not sure why it has a 10 bolt but it does.

Re: 12 bolt Rear End Info
 

Jeff is it trailing arms?
Jimmy

Re: 12 bolt Rear End Info
 

The 12 bolts i found local is leaf spring. The 10 bolt I have currently is trailing arms.
I didnt know if the 12 bolt was worth grabbing or just keeping the 10 bolt. But it sounds like the 10 bolt I have isnt stock so I am curious what it came off of.

Re: 12 bolt Rear End Info
 

You need to take a close look at the GMC rear and make sure it is not a Dana 44. They were in a good bit of them. I have trailing arm12 bolts if you need one and a Dana 44.
Jimmy

Re: 12 bolt Rear End Info
 

my 66 gmc had a 10 stock with leaf springs

Re: 12 bolt Rear End Info
 

That would be a Dana 44.

Re: 12 bolt Rear End Info
 

Got a pic of the markings on my 10 bolt- is this the Dana 44?
https://i.imgur.com/f9AO6fwl.jpg
https://i.imgur.com/RpKO8z5l.jpg

Re: 12 bolt Rear End Info
 

Nope that's not a Dana. Looks like a car or maybe a S10 rear.
Jimmy

Re: 12 bolt Rear End Info
 

so I still have that diff if you want to make a road trip to Nebraska lol!!!, I would throw it on my trailer and bring it to you but I can't find nj in my atlas

Re: 12 bolt Rear End Info
 

No need to go all the way to Nebraska. He does need a good 12 bolt.
Jimmy

Re: 12 bolt Rear End Info
 

Ya I was just kidding, I built a 12 bolt posi with 373s for mine

Re: 12 bolt Rear End Info
 

Oh wow, That chrome cover has a lot of bling bling.