Last week I had a new gasket put on my rear, and the guy that did it told me I don't need the friction modifier for it because it doesn't have clutch packs or anything. It was starting to leak and I was getting the shudder when turning from a stop, and I'm still getting it with the new fluid. What I'm asking is do I need the modifier or not I don't want to mess anything up that I don't have too

 

If your signature is correct, than you shouldn't have a limited slip they only came with trucks with the 3.55 or 3.73. Therefor you don't need the additive.

What is your axle code on your drivers side door jamb?

 

Yea it does have the 3.31 gears, I'll get the code to be sure thanks man