SPECIALIST AUTOMATIC TRANSMISSION ENGINEERING

AUTOMATIC GEARBOX
REPAIR & REBUILDS.

Specialist diagnostics, hydraulic valve body testing, torque converter reconditioning, and complete mechanical rebuilds for torque-converter automatic transmissions across England and Wales.

UP TO 60% CHEAPER THAN MAIN DEALER ✦ FREE RECOVERY (COMPLETED REPAIRS) ✦ 12-MONTH / 12,000-MILE WARRANTY ✦ GENUINE OEM-GRADE PARTS ✦ ALL MAKES & MODELS ✦

TECHNICAL GUIDANCE

What to Know About Your Automatic Transmission Problem

Understanding Automatic Gearbox Operation: Traditional automatic transmissions rely on a hydraulic torque converter, planetary gearsets, and an electro-hydraulic valve body with electronic solenoids. When internal friction plates wear, hydraulic fluid degrades, or solenoid valves become fouled, drivability issues become apparent. For specific manufacturer transmission details, explore our BMW & ZF Steptronic Guide or Mercedes 7G & 9G-Tronic Guide.

Can I Keep Driving?: If your automatic transmission is slipping severely (engine revs flare without vehicle acceleration), refuses to shift past 2nd/3rd gear, displays a transmission emergency message, or leaks fluid, continuing to drive risks burning out internal clutch packs. Stop somewhere safe and request a professional assessment.

Does the Entire Transmission Need Replacement?: Not always. Many automatic transmission symptoms are caused by isolated faults such as a malfunctioning mechatronic valve body, faulty shift solenoid, worn lock-up clutch inside the torque converter, or degraded transmission fluid. A proper diagnostic inspection determines whether a targeted component repair or full rebuild is warranted.

Turnaround & Warranty Protection: Turnaround is job-dependent, typically taking 3 to 7 working days following diagnostic assessment and parts availability. Qualifying full rebuilds for private vehicles include our 12-Month / 12,000-Mile Warranty; component-specific repairs and commercial vehicles carry a 6-Month / 6,000-Mile Warranty.

Specialist transmission overhaul facility

60% Cheaper Than Dealer

DIAGNOSTIC SYMPTOMS

Common Symptoms of Automatic Gearbox Malfunction

Paying close attention to initial warning signs allows targeted repairs before catastrophic failure occurs:

1. Transmission Slipping & RPM Flare

⚠

The engine revs increase during acceleration or gear changes without a corresponding increase in road speed, which can indicate worn internal clutch packs or low hydraulic fluid pressure.

2. Delayed Drive or Reverse Engagement

⚠

A noticeable pause of several seconds when shifting from Park into Drive or Reverse, often accompanied by a sudden thud as hydraulic pressure builds.

3. Harsh or Jerky Gear Shifting

⚠

Aggressive knocking or jolting during upshifts or downshifts, which can be associated with sticking hydraulic valve body spools or solenoid wear.

4. Torque Converter Shudder at Cruising Speeds

⚠

A vibration or shuddering sensation resembling driving over rumble strips, often noticeable between 40–60 mph when the torque converter lock-up clutch attempts to engage.

TECHNICAL GUIDANCE

TRANSMISSION GUIDANCE & OVERVIEW

Diagnostic Assessment & Repair Pathways: Through our approved engineering partner facilities, we evaluate your automatic vehicle using diagnostic telemetry, fluid condition checks, and road-load analysis:

Torque Converter Overhaul: Reconditioning the internal stator, one-way clutch, and lock-up friction lining.
Valve Body / Mechatronic Servicing: Cleaning, testing, and replacing hydraulic solenoids and electronic conductor plates.
Full Mechanical Rebuild: Complete teardown, replacement of all friction plates, steel plates, seals, bushings, and bearings.

Every vehicle receives a bespoke, itemised quotation based on its transmission family and diagnosed repair requirements. Request Automatic Assessment

Official Warranty Protection: WARRANTY INCLUDED ON QUALIFYING REPAIRS Qualifying full automatic rebuilds and reconditioned transmission installations for private passenger vehicles include our 12-Month / 12,000-Mile Warranty (whichever occurs first), covering parts and specialist workmanship. Component-specific repairs (e.g. targeted torque converter or valve body repairs) and commercial/intensive vehicles carry our 6-Month / 6,000-Mile Warranty. View Full Warranty Terms →

60% Cheaper Than Dealer

ENGINEERING SPECIFICATIONS

Supported Automatic Transmission Families

ZF Automatic Transmissions (ZF 6HP & ZF 8HP Series)

Widely fitted across BMW (1 Series through 7 Series, X3/X5), Land Rover (Discovery, Range Rover Sport), Jaguar, and Audi models. Renowned for fast shifting, but common faults over high mileage include mechatronic bridge seal leakage, E-clutch wear, and torque converter lock-up degradation.

Mercedes-Benz 7G-Tronic & 9G-Tronic (722.9 / 725.0)

Fitted across Mercedes-Benz C-Class, E-Class, GLC, and commercial Vito/Sprinter models. Common issues include electronic conductor plate speed sensor failure and internal valve body solenoid wear.

Aisin Warner Transmissions (TF-80SC, AWF8F35, etc.)

Fitted across Volvo, Peugeot, Citroën, Vauxhall, Mini, and Toyota transverse applications. Known for smooth operation, though high-mileage units frequently suffer from valve body wear and shift flare.

12-MONTH / 12,000-MILE WARRANTY INCLUDED

NEED EXPERT TRANSMISSION REPAIR?

Speak directly with our transmission specialists or enter your registration for a rapid itemised quote.

AUTOMATIC GEARBOX REPAIR & REBUILDS.