What rear diff is this?
Melting Slicks
Joined: May 2002
Posts: 2,476
Likes: 756
From: Laporte, IN
Ether way you would need to remove the Differential. If you want it rebuilt to a posi would at that time have it evaluated to what additional upgrades would be needed to protect your investment.
Tech Contributor
Joined: Aug 1999
Posts: 15,173
Likes: 3,982
From: Connecticut, USA
You have to remove it and open it up to see what you have. It could be anything from the past 45 years in there. The 64 housings would have a tapped hole on each side of the front bracket instead of the through bolts that 65-79's had. Any 65-79 Eaton or new Eaton will fit the housing. The bearing caps will be wider if it's a 64. The 63-66 housings were narrow and the side shims are not sold in any master kits sold today. If you have an open diff it will work fine for street use, if you have the original DANA posi it was junk, it you have an 65-68 posi they weren't much better. 69- 71 were ok, 72-79 were the best posi cases and they came with junk clutches. Solid Steel clutches are on bad order for months now.
