S-10CREWCAB.NET

Moved to NOS since the crew cabs did not have a 8.5" diff-HJ

I have notice that a few NON ZR2 S10 based 4x4 AND 2wd trucks/suv's have the 8.5" rear diff. Instead of the "regular" 7.65" diff .

Is there anyway to tell which one is there , just by the outside cover ?

I guess you could compare it to a Zr2 diff . But I can't fnd a good clear picture of one .

Any thoughts ?

The 8.5 cover is rounder than the 7.5 and 7.625. It is pretty easy to tell once you have seen both.

Zr2.com used to have a good picture.

Here ia a Camaro cover-


That gives you kind of an idea.

Here's my 8.5" :

The gaskets show the differences pretty well also. Like Brule said the 8.5" is more rounded than the 7.5" or 7.625".

8.5" 10 bolt gasket.



7.625" 10 bolt gasket



Steve