The noise may also change when performing side-to-side maneuvers with the vehicle.Ī rough and/or noisy wheel bearing can be heard by spinning the wheels by hand and listening at the hubs for the noise. The noise may diminish some when the brakes are gently applied. Inspect and replace the bearings and the affected components as required.Ī rough front wheel bearing produces a noise which continues with the car coasting at low speed and the transmission in neutral. This noise can be confused with front wheel bearing noise. This indicates a bad pinion or a bad front axle side bearing. Bearing noise (hum) will pulsate at a constant vehicle speed. Gear whine is corrected by ring and pinion gear replacement or adjustment, depending on the mileage of the gear set.įaulty bearings produce a rough growl or grating sound, rather than the whine typical of gear noise. Gear noise most frequently has periods where the noise is more prominent, usually between 48-64 km/h (30-40 mph) and 80-85 km/h (50-53 mph). * Coast - Throttle is closed and the vehicle is in gear * Float - Using enough throttle to keep the vehicle from driving the engine, the vehicle slows down gradually but the engine still pulls slightly * Road Load - Vehicle driving load or constant speed Gear noise or whine is audible from 32-89 km/h (20-55 mph) under 4 driving conditions: If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. Please follow this diagnosis process thoroughly and complete each step. Replace the shaft and associated bearing. Look and feel for any high spots, flat spots, or roughness on the shaft surface where the bearing rides on the shaft.
If the listening device detects a noise in the rear axle bearing area, inspect the rear axle shafts for any mis-machining on the bearing surface. This noise may be difficult to diagnose since it may actually be coming from the rear axle.Ĭheck for possible rear axle noise by using chassis ears or a stethoscope on a suspension contact hoist. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.Ĭoncern is a phasing, growling, cyclic noise that may sound like it is in the front axle or wheel bearing area. 8.625 Axle Phasing, Growl, Cyclic, Noise While Driving - keyword bearing differential front grind housing information part performance pinion rear loose shaft vibration #PIP3379 - (Mar 29, 2005)Ģ005 Chevrolet Silverado, Suburban, Tahoe
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