NP3 NVG149 Transfer Case Bind or Shudder on Turns - keywords differential growl grind G80 lock transfercase vibration

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Light duty trucks and utilities equipped with an RPO code NP3 NVG149 transfer case may exhibit a bind or shudder on turns.

Diagnosis for this concern should start by checking for possible mismatched tires by swapping the wheels and tires from a properly functioning vehicle for testing purposes. If the tire check does not repair the concern, next test the transfer case viscous coupling as per eSI Document ID # 874570. If the transfer case passes the viscous coupling test, check to see if the vehicle is equipped with a G80 locking differential or a limited slip differential. If it is, refer to locking rear differential diagnosis in eSI Document ID # 703405 or limited slip differential diagnosis eSI Document ID # 820995. If the locking differential or limited slip differential is functioning properly, a steering or suspension issue could be causing the concern.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.