Recently, my 2001 Z71 started making noise from somewhere in the front end.
I think it may be the diff, but I can't be sure. It only happens in 4WD
(auto, hi, or lo) and when I shift back to 2WD, the noise stops completly.
The frequency of the noise increases with road speed.
I changed out all the fluids (except for the tranny) and replaced them
with synthetic front/rear and the Autotrak II fluid for the transfer
The problem seems to only happen once the vehicle and all it's fluids get
up to normal operating temperature. I'm not sure where to go from here
(except to the shop!)
Any and all help is appreciated!!