[chrisjensen01]

Does anyone know what I have here? It's a passenger 12 bolt GM rear end with 3.55 gears, but the carrier... Is it limited slip or open? Anyone know the brand?

 

[Mike]

It's a limited slip (posi) but doesn't look like an Eaton.
Freddie or Tory could id it by sight but I'd need you to post a pic of the opposite side and see if you can get the numbers off the ring gear end -on the bearing side.

 

[big gear head]

It's the Eaton Posi. That's the back side of it. If you turn it around you will be able to see the springs, plates and clutches better. That's a 3 series with the original 200 pound springs. The casting number on the case will be EDB30140.

 

[chrisjensen01]

Wow what a response. Yes, if you turn it around you do get a better view. Thanks!