Hey guys can i use the Mopar posi additive in my Chev? I have some of it and would hate to buy new if i can use the old. Ralph

I don't see why it wouldn't work. The Mopars used steel clutches just like the Chevys.

Ralph,

I tried the Mopar additive - once, because I thought the same thing, should work.

Didn't seem to. Drained the diff, refilled and poured in the GM additive. Better.

However, may not have been apples to apples. I had just purchased the car and the rear was chattering a bunch. I simply added the Mopar stuff to lube that was already in the diff - for who knows how long. No noticeable improvement at all.

Then I drained and refilled with fresh lube and GM additive. Much better.

Dan