Drivetrain
What is a Differential?
Lets your driven wheels turn at different speeds in corners.
Simplified animation — not to scale.
In plain English
A clever set of gears in the axle (or gearbox on front-wheel-drive cars) that splits the power between the two driven wheels.
A simple analogy
"It is the wheels' negotiator — making sure each one turns at exactly the speed it needs to in a corner, instead of fighting each other."
How it works
In a straight line both wheels turn at the same speed. In a corner, the outer wheel has further to travel, so the diff lets it spin faster than the inner one without the tyres skipping.
Signs of trouble
- ⚠Whining or howling noise that changes with speed
- ⚠Clunk when pulling away or changing direction
- ⚠Vibration on cornering
- ⚠Oil leak from the axle
Rough UK cost
£400–£2,300
Parts: £200–£1,500
Labour: £200–£800
Always get a written quote. Prices vary by car, region, and parts brand.
Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.