|
|
Differential bearings usually produce a low pitch noise. Differential bearing noise is similar to pinion bearing noise. Axle shaft bearings produce noise and vibration when worn or damaged. The noise generally changes when the LOW SPEED KNOCK Low speed knock is generally caused by a worn U-joint or by worn side–gear thrust washers. A worn pinion shaft VIBRATION Vibration at the rear of the vehicle is usually caused by a: • Damaged drive shaft. • Missing drive shaft balance weight(s). • Worn or out-of-balance wheels. • Loose wheel lug nuts. • Worn U-joint(s). • Loose/broken springs. • Damaged axle shaft bearing(s). • Loose pinion gear nut. • Excessive pinion yoke run out. • Bent axle shaft(s). Check for loose or damaged front-end components or engine/transmission mounts. These components can contrib- NOTE: All driveline components should be examined before starting any repair. 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 determined with the assistance of a helper. Raise the vehicle on a 3 - 348 REAR AXLE - 248RBI DR/DH |