Royal Purple Differential grease

[Jims455]

anybody use it? If so, does it add or take away gear noise? Are there any draw backs to using the stuff?

[msb304]

I used it when replacing my leaking pinion seal and changed the fluid. I haven`t noticed any difference other than the posi unit seems to be a bit tighter. By tighter I mean when turning at low speed, and at the 1st to 2nd upshift point, I sometimes hear a slight tire chirp. Other than that, no difference at all.