Common Transmission and Drivetrain
Differential Wear and Noise
Symptoms
Whining or howling from the rear axle, especially under load or when coasting. Clunking when changing direction (forwards to reverse).
Cause
Worn pinion bearings, differential side bearings, or backlash in the crownwheel and pinion. Low or contaminated oil accelerates wear.
Fix
Drop the differential oil and inspect for metal particles.
If there's excessive play or noise, it's a rebuild or replacement job.
Setting up a diff correctly (shims, preload, backlash) requires skill and special tools, best left to a specialist unless you're experienced.
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