I have a 10 Bolt rearend in my z28... no posi.. id like to change that. I was kinda thinking just buy an I-roc rearend to get the posi and the rear disc breaks.. but i wouldn't mind just grabbing a posi.

anyone have and idea where to get one?? and which one?

 

I don't know where to find a "posi", but limited slips were available in a lot of 3rd & 4th gen rear axle assemblies. Check for RPO G80 which is the Limited slip code.

 

Check the following link, which may provide some ideas:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

 

just food for thought, not all IROC's had limited slip and disk brakes. My 85 Iroc is a one wheel wonder with drums

But i did pick up an 89 IROC rear with limited slip and disks, its the 9 bolt borg warner rear with aluminum calipers. From what i have read on this site its about the strongest rear you can put in the car that is a direct swap. 4th gen axles swap in but are a bit longer and require different wheels with a deeper offset.

 

The Eaton Posi is the best all around limited slip differential for GM cars in my opinion. They last a very long time, they are rebuildable and can be tuned to fit your needs.

 

i believe the 9 bolt borg warner rears also have 28 spline axles, the same axles as a 4th gen. They are stronger than the 26 spline 10 bolt axles.

I thought i read that on here somewhere but i cant find the particular post, can anyone verify?