front differential
 

I have a 99 Silverado 4x4. If I am making a turn in either direction in 2 hi at very slow speeds i.e 5 mph or less the front wheels drag like its a posi trac. If I go over 5 or so mph it does not do this. On occasion when this happens i get a loud clunk from the front drive train. I have removed and checked the front differential motor to make sure it is retracting. It does. When I put the truck on jack stands both tires turn when I turn them. If I try to hold one and turn the other it is very difficult to turn. This does not happen in reverse. Any insight on this would be appreciated. Thanks in advance.

RE: front differential
 

i had the same problem and the clunk got real bad. i was worried about the diff too, but was told to first lube the steering shaft just incase (very inexpensive). havent hade a prob since.

RE: front differential
 

I had the same problem with my 2003 Silverado. Fortunately it was still under warranty and the dealer lubed the steering shaft; it works great now. Chevy knows about the problem.