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• Damaged axle shaft bearing(s). • Loose pinion gear nut. • Excessive pinion yoke run out. • Bent axle shaft(s). or engine/transmission mounts. These components All driveline components should be examined before starting any repair. Refer to Group 22, Wheels and Tires, for additional vibration information. DRIVELINE SNAP A snap or clunk noise when the vehicle is shifted into gear (or the clutch engaged), can be caused by: • High engine idle speed. • Transmission shift operation. • Loose engine/transmission/transfer case mounts. • Worn U–joints. • Loose spring mounts. • Loose pinion gear nut and yoke. • Excessive ring gear backlash. • Excessive side gear to case clearance. mined with the assistance of a helper. Raise the vehi- TRAC–LOK Y DIFFERENTIAL NOISE The most common problem is a chatter noise when turning corners. Before removing a Trac-lok y unit for repair, drain, flush and refill the axle with the A container of Mopar t Trac-loky Lubricant (fric- tion modifier) should be added after repair service or After changing the lubricant, drive the vehicle and make 10 to 12 slow, figure-eight turns. This maneu- TRAC–LOK Y TEST WARNING: WHEN SERVICING VEHICLES WITH A Y DIFFERENTIAL DO NOT USE THE ENGINE TO TURN THE AXLE AND WHEELS. BOTH SUPPORTED. A TRAC–LOK Y AXLE CAN EXERT ENOUGH FORCE IF ONE WHEEL IS IN CON- TACT WITH A SURFACE TO CAUSE THE VEHICLE The differential can be tested without removing the differential case by measuring rotating torque. Make (1) Place blocks in front and rear of both front wheels. (2) Raise one rear wheel until it is completely off the ground. (3) Engine off, transmission in neutral, and park- ing brake off. (4) Remove wheel and bolt Special Tool 6790 to studs. (5) Use torque wrench on special tool to rotate wheel and read rotating torque (Fig. 5). (6) If rotating torque is less than 22 N·m (30 ft. lbs.) or more than 271 N·m (200 ft. lbs.) on either VARI-LOK Y TEST PRIMING (1) Park the vehicle on a level surface or raise vehicle on hoist so that the vehicle is level. (2) Remove the axle fill plug. fluid level is correct if the fluid is level with the bot- (4) Shift the transfer case into the 4WD full-time position. (5) Drive the vehicle in a tight circle for 2 minutes at 5mph to fully prime the pump. Fig. 5 Trac-lok Y Test —Typical 1 – SPECIAL TOOL 6790 WITH BOLT IN CENTER HOLE 3 - 102 226 RBA AXLE WJ DIAGNOSIS AND TESTING (Continued) |