Noise Evaluation for Four Wheel Drive (4WD) Applications

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

With the vehicle at a complete stop and the transfer case in NEUTRAL, shift the transmission through all of the gear ranges and evaluate the noise at different engine RPM. Check for any noise in NEUTRAL at different engine RPM.
Check for any noise change when shifting the transfer case between 2H, 4H, 4L and NEUTRAL.
Refer to FOUR WHEEL DRIVE (4WD) SYSTEMS article for four wheel drive (4WD) system concerns.