02-15-06, 11:15 AM
There is a Technical Service Bulletin that may help or elimanate front Diff Noise. It seems to be well known that the front differentials in many Escalades are noisey, whine, etc. Mine had a bad bearing as many others have which was replaced under warranty (actually replaced all bearings and seals). I still heard some faint noise above 40mph at steady throttle as when in Cruise Control. Although I hope to eventually get the front Diff repalced as other have, I did get some help from my dealer. There is a Technical Service Bulletin for front Differential noise that requires replacing the front prop shaft (the drive shaft between the transfer case and the front differential). The new part has an internal damping system instead of just being a hollow shaft. The part number is 15186002 and it sells for $161 from GM Parts Direct - anyone under warranty can get it for no charge. Mine got the new shaft yesterday and although I haven't finished my assesment, it does seem to have helped. I took a ride this morning and couldn't tell if I was hearing anything or not. Before I could hear the noise clearly even with the radio on at lower volume. I need to listen carefully at different highway speeds then I can give my final opinion. For anyone with marginal noise this might really help especially if your dealer doesn't think it bad enough to be replaced. Has anyone else had this prop shaft replaced and did it help ???