Pontiac Problems? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Ok, quite a bit of information that is needed is missing -
Exact circumstances of grinding noise - all the time, only on acceleration, only at steady speed, rotational, etc
Does the grinding either lessen or increase when turning in one specific direction
Does it make a grinding noise if you put it in neutral and coast
Does the noise appear to be coming from the wheel area or more centered in the engine compartment
Please remember that I am not there to test drive it and therefore rely on you to provide as much information as possible
Ok, because it happens in neutral, we can rule out the tansaxle/differential gears and shafts. It may be the output shaft bearings in the differential that the cv shafts go thru because the cv shafts will still turn in neutral. The only other cause is one of the cv shaft housing tripod and bearings.
It needs to go on a lift and have someone put it in gear and accelerate while someone listens to each cv shaft tripod inner and outer housing and then listen at the differential where the shafts go into it with a mechanic's stethoscope. This will enable one to verify the cause.
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They wont damage the transmission due to failure or debris. They can eat up the ends of the cv shafts though and require their replacement. They are only servicable by dropping the transaxle assembly and removing the case to get to them
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