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level. Where axle bearing damage is slight, the noise LOW SPEED KNOCK Low speed knock is generally caused by a worn U-joint or by worn side–gear thrust washers. A worn 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). or engine/transmission mounts. These components tion. Do not overlook engine accessories, brackets NOTE: All driveline components should be exam- 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. mined with the assistance of a helper. Raise the vehi- DIAGNOSTIC CHART Condition Possible Causes Correction Wheel Noise 1. Wheel loose. 1. Tighten loose nuts. 2. Faulty, brinelled wheel bearing. 2. Replace bearing. Axle Shaft Noise 1. Misaligned axle tube. 1. Inspect axle tube alignment. 2. Bent or sprung axle shaft. 2. Inspect and correct as necessary. Axle Shaft Broke 1. Misaligned axle tube. 1. Replace the broken shaft after 2 Vehicle overloaded. 2. Replace broken shaft and avoid 3. Erratic clutch operation. 3. Replace broken shaft and avoid 4. Grabbing clutch. 4. Replace broken shaft and inspect TJ REAR AXLE - 194RBI 3 - 85 REAR AXLE - 194RBI (Continued) |