Ah Cherokee GT and all who have replied: Mitch011 is my son and let me explain a bit more about what we did to figure out where this noise might be located. First, I shook the drive shaft at the rear u-joint just forward of the rear differential. It seems solid with very little to no play. We have the jeep up on four jacks and went through all the gears. 1st gear, couldn't hear the noise, 2nd gear started to hear it, 3rd and 4th gear really heard it. It is not a whir or whistle like you would hear from a clutch throw out bearing. More of a click or clunk as the drive shaft turns. Took the greater RPM's for the noise to really produce itself. So, while drivetrain was turning I put a 1/2" solid brass rod to the bottom of the differential case and cupped the other end to my ear. The noise seemed louder toward the yoke shaft portion of the diff case than when I moved the rod back more toward the center of the bottom side of diff. case. So, not sure if it is differential or pinion gears, the pinion bearing or the U-joint?
I was thinking of taking out the rear drive shaft, then driving it in Front drive only. If the sound does not produce itself when on the road and going through the gears, then it isn't in the diff. gear box but could still be rear pinion bearing or the u-joint. Am I thinking right here?? Any other testing ideas anyone.
We kind of ruled out the transmission even though told it may need bearings because when we put the transfer case in neutral and went through the gears no noise. I agree with my son. AT 73K miles trans. bearings shouldn't be bad
Thanks and thanks.