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Axle shaft bearing noise generally changes when the bearings are loaded. Turn vehicle sharply to the left and the LOW SPEED KNOCK Low speed knock is generally caused by: • Worn U-joints or C/V joints. • Worn side-gear thrust washers • Worn pinion shaft bore. VIBRATION Vibration at the rear of the vehicle is usually caused by: • Damaged drive shaft. • Missing drive shaft balance weight(s). • Worn or out of balance wheels. • Loose wheel lug nuts. • Worn U-joints or C/V joints. • 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 or C/V joints. • Loose spring mounts. • Loose pinion gear nut and yoke. • Excessive ring gear backlash. • Excessive side gear to case clearance. To determined the source of a snap/clunk noise, raise vehicle on a hoist with the wheels free to rotate. Have a HB REAR AXLE - 9 1/4 3 - 111 |