can someone help me out if possible i have a junk yard near by with some camaros in it and firebirds and i heard s-10 rears will fit also but not 100% on that one. can anyone here tell me how to tell if its a posi or just a plain limited slip differential? any help is apreciated!!!

 

Only way to tell is by pulling the cover and see what gears are in there.

 

Look for the G80 RPO code located in the glove box for the s-10 pickup/blazer and s15 Jimmy and in the center club box or rear glove box of 3rd gen.

 

Rpos are only good to know what it came out of the factory with 20 years ago...


An easy way is if the back tires are off the ground, spin one and if the other spins the same way its a posi or a really pootched open. *but* it could also spin opposite ways and just be a burnt up posi, but most likely in that case its an open.


Best way, and its so easy to do is to pull the cover!

 

thanks for the help guys!

 

a posi and limited slip are the same thing.

do you mean an open, compared to a posi? Someone should really post a view inside a diff, of an open and posi. It's a pretty obvious difference....If you know what you're looking for.

 

...that doesn't work for the torsional style posi units. They'll spin opposite, like an open diff, but when smacked from the pinion they spin both.
pull the cover and look. Plus, count teeth and figure out the gear ratio. That way you don't end up with a 2-series posi....

 

Thats why i said to pop the cover!

Like c'mon, its 10 bolts and you would have to pull thm if you wanted the carrier anyways!