Possible signs of a transfer case problem include difficulty engaging or disengaging four-wheel drive, grinding or clunking noises, fluid leaks, vibration or a 4WD warning light. Some vehicles may also behave differently when changing between drive modes.

These symptoms can also come from other drivetrain or control-system components. Certified Transmission in Bellevue can diagnose the system and determine whether the transfer case is actually responsible before recommending repair or replacement.