I have a 2002 4x4 Silverado 1500 (4.8L) and when I drive at the lower end of
the 4th gear (overdrive) around 37 to 40 mph I hear a grinding noise that
seems to come from my rear axle. I goes away as soon as I slow down, go
faster or shift on the third gear. Did anybody experienced that kind of
problem and what was it.