I was talking with someone about the whine the rear end makes from about 35 moh up on my truck and he told me he has the same truck as me ( 04 screw) and that he drained his axle and filled it with 2 quarts of 75-140 Royal Purple and 1 quart Lucas oil addative and his whine was all but totaly gone.
I haven't tried this but I am thinking about it.
Has anyone heard of this?
Good,bad what do you think?
Ed