Pinpoint Test A: Excessive Driveline Noise

A1: CHECK NOISE FROM VEHICLE ON ROAD TEST
1. Road test vehicle to determine load and speed conditions when noise occurs.
2. Assess the noise with different gears selected.
  Does the noise occur in different gears at the same vehicle speed?
  - Yes : INSTALL a new rear drive axle/differential assembly.
    Refer to: DIFFERENTIAL CASE - VEHICLES WITH: 9HP48 9-SPEED AUTOMATIC TRANSMISSION - AWD
    
    RE-TEST the system for normal operation.
  - No : Refer to: ENGINE DIAGNOSTICS - VEHICLES WITH: 9HP48 9-SPEED AUTOMATIC TRANSMISSION - AWD