We do not repair or rebuild automatic gearboxes — we replace them when the transmission itself has failed. Internal rebuilds are specialist bench work with a high failure rate when done occasionally. But not every automatic fault is a failed gearbox: sensors, wiring and fluid condition can cause the same symptoms, so diagnosis comes first.
Why don't you rebuild automatic gearboxes?
Modern automatic, DSG and CVT transmissions are precision assemblies. Rebuilding them properly needs factory-level facilities, and a partial rebuild carries a real risk of early failure. A supplied replacement unit gives a more reliable result, so when the transmission has genuinely failed, that is what we fit.
What can be fixed without replacing the gearbox?
Plenty of faults that put an automatic into limp mode are not internal failures. A sensor, wiring, degraded fluid or a component changed as a complete unit — such as a DSG mechatronic unit — can be the cause. If diagnosis shows that, we tell you, because it is not a replacement job.
On torque converter automatics, degraded fluid can cause shudder that a fluid and filter service resolves. Where the lock-up clutch has worn, the converter is replaced rather than opened up.
How is the decision made?
We read the transmission's fault codes, check fluid condition and road test the car. Symptoms such as slipping between gears, harsh or delayed engagement, flaring revs, judder or limp mode do not confirm replacement on their own — that is what the diagnosis is for.
What does a replacement cost?
A replacement automatic gearbox supplied and fitted typically runs from around £1,800 on common models to well over £4,000 on larger DSG and torque converter applications. We give one fixed price covering parts, fluid and labour before any work starts.