Just looking to see if someone else may have had a similar prob.

Car is all stock M6 99 SS. I just got it recently. If I have the windows closed and the radio off, when I'm driving, I hear what sort of sounds like a caliper with no pad grinding on the rotor. It might be in my head - but it seems like I only hear it when coasting, or decelerating. When I push the throttle - even just a tiny bit - it seems to go away.

It's not the rotors - I checked them today. The wheel bearings also appear to be fine. When it's grinding, if I put on the Ebrake it has no affect. Seems to get louder as I'm getting closer to a complete stop.

Also, noticed a spot of oil on my garage floor in the morning right under the dif - but I don't see anything leaking. Should I pull the cover and make sure everything looks ok? Could it be the gears?

Hope it's nothing crazy, thanks for any help.

Id check to see if your dif is leaking first. Then I would change the fluid and add in the GM limited slip dif additive, that would probably get rid of the noise.

Ok, changed the diff fluid and no difference. Used synth 80w oil in the rear, with a thing of GM limited slip additive. There were metal shavings on the magnet, but not a grazy amount. Gears themselves looked clean..





Any ideas of where I should look next?
thanks

I have heard of a similar noise in my buddies 98' ws6 but it wasn't stock,he twisted his rear end from heavy playing put another rear end in and did it again.He ended up putting moser 12 bolt in,nothing you should need though.If everything elkse is ok it could be that