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 or CV.
• Loose spring mounts.
• Loose pinion gear nut and flange.
• Excessive ring gear backlash.
• Excessive side gear to case clearance.

The source of a snap or a clunk noise can be determined 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.