Ok so I just picked up a 90 formula 5.0 auto. When I am at a complete stop and hit the gas there is a grinding sound thats pretty loud but doesn't sound like a brake grinding. It is def from the mid to rear of the car and only makes the noise on accelerating from a stop. I don't think it could be the diff seeing as how it only does it for a few seconds after moving from a stop. Any suggestions would be appreciated.. Thanks