What Causes the Rear Noise in Buick LaCrosse?

[LouisMarie]

The causes of rear noise in Buick LaCrosse are as follows: 1. Excessive meshing gap: A noise occurs at the rear of the vehicle when shifting gears, decelerating, or abruptly changing speed. The primary causes are excessive meshing gaps between the conical driving and driven gears, cylindrical driving and driven gears, planetary gears and axle shaft gears, or the keyway of the axle shaft gear and the spline teeth of the axle shaft. Adjusting the gap or replacing related components can resolve the issue. 2. Insufficient meshing gap: A continuous "hissing" sound from the rear of the vehicle during acceleration or after releasing the throttle pedal, accompanied by overheating, is often caused by insufficient meshing gap or poor meshing between gears. Insufficient or poor-quality lubrication oil can also lead to similar symptoms. Replacing the engine oil or adjusting the gap can fix the problem. 3. Axle shaft or axle sleeve noise: If the axle shaft or axle sleeve is bent and rubs against each other, an intermittent "clunking" sound will occur while driving. If the rubbing is severe, it may turn into a "rumbling" impact sound. Replacing the affected parts or visiting a repair shop is necessary.