Driveline Snap

A snap or clunk noise when the vehicle is shifted into gear (or the clutch engaged), can be caused by:
^ High engine idle speed.
^ Transmission shift operation.
^ Loose engine/transmission/transfer case mounts.
^ Worn U-joints.
^ Loose spring mounts.
^ Loose pinion gear nut and yoke.
^ Excessive ring gear backlash.
^ Excessive side gear to case clearance.
The source of a snap or a clunk noise can be deter mined with the assistance of a helper. Raise the vehicle on a hoist with the wheels free to rotate. Instruct the helper to shift the transmission into gear. Listen for the noise, a mechanics stethoscope is helpful in isolating the source of a noise.