Rear end issues/questions

[BurnTire]

If it is a stock trac loc it could be the spider gears.

Ok thanks, I will check the brake calipers as well, but i dont believe thats what it is because its not that kind of grinding, its more of a gears grinding sort of sound. Which tends to lead me to believe wheel bearing. If wheel bearings are good what are we talking about in the diff...gears, locker? etc.

Thanks for the advice

[99WhiteGT]

Its an aftermarket trac loc, so i picked up the wheel bearing and seal today. I'm going to pull apart the rear end this week sometime, does anyone have recommendation on gear oil, i usually run royal purple 75w140, but i was talking to a buddy of mine and he said not to run that shit.