One problem related to driveline center support bearing has been reported for the 1999 Jeep Grand Cherokee. The most recently reported issues are listed below.
Rear axle pinion gear and bearing failure due to retaining nut backing off. If left unfounded failure of drive train and rear axle lock up would occur. Initial thought by mechanic universal joint was bad. Further investigation found retaining nut backed out, ring and pinion gear and axle bearings chewed up as result of nut backing off.