Rear Axle Diagnosis

Rear axle pitch line runout on the 4X4 Ram 1500 Truck with a 9-1/4 in. axle and 3.55:1 axle ratio can cause a surge/vibration to start to occur at approximately 45 mph (72 kph) at the point when the torque converter clutch first engages (torque converter clutch must be engaged) and then goes away at approximately 62 mph (100 kph). The condition will be most noticeable when the vehicle is under a light load (e.g driving up a small hill). If using the EVA, driveline surge/vibration will occur at approximately 8 - 12 Hz. If your diagnosis has determined that the root cause of the vehicle's surge/vibration is related to rear axle pitch line runout, replace the rear axle ring and pinion gear set.

NOTE:
TECHNICAL SERVICE BULLETIN 18-48-98, DATED DEC. 30, 1998 SHOULD BE PERFORMED PRIOR TO REPLACING THE REAR AXLE RING AND PINION GEAR SET FOR A VEHICLE SURGE/VIBRATION CONDITION.

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