Hi,
I have a 2001 Tahoe with about 70k on it. Yesterday, when engaging 4 Hi on snowy-icy roads, the front end started making a grinding-howling noise. It goes away when put back in 2wd and also makes the noise, although not as bad, in Auto. I drained and refilled the front diff. The level was a little low and there seemed to be some shavings in the oil as it drained. I refilled with new synthetic lube and the noise is still there. There seems to be a very slight leak on the left axle seal, however I don't know if that would have anything to do with it. Just wanted to give all of the info.
Does anyone have any suggestions on where to look to find this problem? Has anyone heard of this before? I only bought the truck this spring and tried the 4wd in all modes and everything seemed to work just fine then. Winter is coming and I need to get this fixed. Any advise would be greatly appreciated.
Thanks in advance,
Jason