The gearbox is one of the most expensive assemblies to replace on any vehicle. Manual or automatic, CVT or dual-clutch DSG, the same principle applies: regular maintenance and early attention to symptoms costs far less than waiting until something fails. At KITH Cars Garage in Hackbridge, gearbox servicing and repair is carried out at the medium rate of £72 per hour.
Manual gearbox oil rarely gets changed because no warning light tells you to. The service interval indicator in the car usually ignores it entirely. But the oil degrades over time. It loses viscosity, accumulates metal particles from normal gear tooth contact, and stops providing adequate protection. Notchy gear changes, difficulty engaging first or reverse when cold, or a whining noise on the overrun are all signs the oil is overdue. A drain and refill is a straightforward job.
Automatic gearboxes depend entirely on clean, correctly specified transmission fluid. The fluid does two jobs at once: it lubricates the internal components and it provides the hydraulic pressure that operates the clutch packs and shifts between ratios. As the fluid ages, both functions deteriorate. The first symptom is usually a slight hesitation between ratios. Left long enough, the clutch packs inside the gearbox start to slip, and at that point a fluid change alone will not fix the problem.
DSG and other dual-clutch gearboxes have a recommended service interval of roughly 40,000 miles or four years, which includes replacing the mechatronic unit filter and changing the fluid completely. This is one of the most commonly missed service items on modern vehicles. The consequences of missing it repeatedly are a mechatronic unit that fails to maintain correct clutch pressures, leading to jerky changes, shudder at low speed, or a complete failure to select gears.
Before recommending any gearbox repair, we diagnose properly. The complex diagnostic at £122+VAT covers gearbox-specific fault codes, live data analysis of the gearbox module, and inspection of the selector mechanism. It is worth noting that a significant proportion of apparent gearbox faults turn out to be clutch or hydraulic issues. The symptoms overlap and the only way to tell them apart is by proper investigation.
Gearbox removal and replacement is only authorised after a written diagnostic report and your explicit written approval. No parts are ordered before we have your agreement. All gearbox removal jobs are escalated to Giles, our workshop manager, before work begins.
