Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Replacement .

Loose propeller shaft mounting bolts

Tighten the bolts, as required. Refer to Propeller Shaft Replacement .

Loose torque tube bracket or a damaged bracket bushing

Tighten the bracket bolts or replace the bracket, as required.

Incorrect gear oil

Replace the gear oil. Refer to Adhesives, Fluids, Lubricants, and Sealers .