1998 camaro 3.8 It has 3.73 richmond gears installed from previous owner, it makes a loud howling sound, you can't hear it from the outside only the inside when driving, as I let off the gas the howling stops, is it suppose to do this?

 

thats the richmond gears whinning. if adjusted wrong when installed it will be worse. welcome to the forum. i moved your thread to the 4th gen section where it belongs. please read the rules and enjoy.

 

yep...richmonds are noisy...I bought a set and had a pro install them. He even checked them after a couple hundred miles. I never could get them to shut up.

 

Yea sure its not more of a whirring grinding noise? If so, you have bearings in need of replacement -- had to do so on BOTH my Camaros with stock diff internals!