I looked for a topic, but i cant find one. i have a whine in the rear end, starts about 30 and gets louder until 45. sounds like a turbo from the rear.. lol. changed the rear diff lube for giggles, no metal or worn gears. i have heard the words pinon angle from shops, but have no idea what that is. shop says its a common thing in camaros, s-10s with this axl.. is this right..
how do i fix, or should i worry at all?

 

think i'd look at bearings and u joints before i worry about pinion angle