My 89 XJ, put new unit bearings up front, now the DS is going bad again. My wifes ZJ has started this god awfull whine at 15 MPH and doesn't stop till you do, if you touch the transfercase shifter just barely, it gets louder. And back to my XJ, When I first crank it up it sounds like a pully chirpping. When I opened the hood to check it out, its coming from the back of the motor, maybe oil pump????