Differential
A differential lets the left and right wheels turn at different speeds in corners while both still receive drive.
What is Differential?
Every driven axle has a differential. All-wheel-drive cars may have three: front, rear and centre. Limited-slip and locking differentials reduce wheelspin when one wheel has less grip. Electronic systems can imitate a limited-slip differential by braking a spinning wheel; this is called an electronic differential lock.
How it works
Small spider gears inside the differential case let one side shaft turn faster while the other slows, as happens when the outer wheel travels further in a bend.
Why it matters for your car
Noises when cornering or a whine at speed can point to differential wear. Some differentials need special oil, especially limited-slip types. Fitting tyres of different diameters on one axle makes the differential work constantly and can damage it.
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