CousinLarry

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.

N2OGTO

car will probably blow up soon...Might wanna get some life insurance

ICEMAN 31

Nationwide has a lot of options

ChocoTaco369

on a more serious note...

does it sound like gear whine to you?

it may be a good idea to open up your differential and check for metal shards. at the very last, if you don't find anything wrong in there, at least it's a good opportunity to change your gear oil - always a good thing.

how are your tires wearing? check to see if your tires are wearing evenly. if you find, say, your rear right tire is worn a lot worse than the other three, then you likely have a problem not related to the gears or differential. if all 4 tires are worn evenly, that tells us something else. even/uneven tire wear tells us a lot about your situation.

waldershrek

iTrader: (1)

Yeah I would check the rear end fluid and see what you find first.....could just be low or worse case you might find some metal pieces in there.

CousinLarry

Ok, all tires are wearing perfectly even..

I will be taking the diff cover off tonight to check it out - guess I'll grab a gasket at lunch time and some oil.

Thanks

5301113

iTrader: (18)

LOL

ChocoTaco369

tell us if you find any metal in there. if you don't, a simple rear end fluid change my quiet things down. just make sure you buy the right weight gear oil.

05 GSXR 1XXX

iTrader: (16)

Just FYI, there is no gasket.. just use RTV silicone

Starion

iTrader: (5)

Umm there sure is a gasket. RTV will probably work fine but there is a gasket.


Whatever noise you have going on sounds pretty minor. Especially since you only seem to notice it on decel. Mine made some crunchy noises when I bought mine on slow turns and new fluid took care of it.

Don't eliminate the rear brakes as a possibility since the parking brake works on a drum system and doesn't use the regular brake pads. My rear rotors were warped as hell and I couldn't figure out why I wouldn't feel it when using the parking brake.

CousinLarry

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..





And I didn't want to RV the whole thing - Advance auto sells the gaskets for like $4.00. Well worth it..

Any ideas of where I should look next?
thanks

Revelation Z28

iTrader: (10)

put the *** on jackstands and spin the tires by hand to reproduce the sound. it may be a bearing in the rear end.

also check to see if anything is touching a rotating part of the drivetrain.