Singapore’s Top Rated Transmission Overhaul Workshop
Transmission Overhaul Specialists · Sin Ming AutoCity · All Makes and Models
A Gearbox Overhaul Fixes the Inside. A Transmission Overhaul Fixes the Whole System.
Most workshops stop at the gearbox.
They strip the internals, replace the consumable components, rebuild it, and hand the car back. Job done. And for many cars, that is exactly the right call.
But for cars where the problem has progressed beyond the gearbox itself, or where the owner wants a complete reinstatement of the entire transmission system rather than just the mechanical core, a gearbox overhaul is only part of the answer.
A full transmission overhaul goes further. The gearbox is completely rebuilt as standard. But the transmission control module, the torque converter, and the valve body are also replaced with factory-refurbished units. Every major component of the transmission system is addressed in a single job. You collect your car with a transmission that has been fully reinstated from the inside out.
Two different warranties covering different components. Complete transparency on what each one covers. Free diagnosis before anything is quoted.
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What Makes a Transmission Overhaul Different From a Gearbox Overhaul
This distinction matters and most workshops either do not explain it or do not offer it.
A gearbox overhaul addresses the mechanical internals of the gearbox unit itself. Clutch packs, seals, gaskets, transmission filter, and correct-specification fluid. Everything inside the casing that wears out over time is replaced. The gearbox is rebuilt to last 100,000km or more under normal driving conditions and it leaves with our 2-year / 40,000km warranty, the longest available in Singapore for gearbox work.
A transmission overhaul does all of that. And then it addresses the three major components that sit alongside the gearbox and work with it as part of a complete system.
The Transmission Control Module The electronic brain of your transmission. It reads data from speed sensors, throttle position, engine load, and driver inputs, and sends commands to the gearbox to control shift timing, shift quality, torque converter lockup, and fluid pressure. When the TCM develops faults, the gearbox behaves erratically even when the mechanical internals are in good condition. A factory-refurbished TCM resets the system with a known-good unit rather than relying on an electronic module of unknown remaining lifespan. 6-month warranty.
The Torque Converter The hydraulic coupling between the engine and the gearbox that transfers and multiplies torque, allows the engine to idle while stationary, and locks up at cruise speed to improve efficiency. A failing torque converter causes shuddering, slipping, overheating, and fluid contamination that spreads through the gearbox internals. A factory-refurbished torque converter eliminates this source of ongoing stress on the rest of the transmission system. 6-month warranty.
The Valve Body The hydraulic control centre of the transmission. A precision-machined aluminium block containing solenoids, pressure valves, and fluid passages that direct transmission fluid pressure to activate clutch packs and control every aspect of gear selection. Valve body solenoid wear and pressure regulation faults cause harsh shifts, delayed engagement, and fault codes that are frequently misdiagnosed as gearbox failure. A factory-refurbished valve body, reconditioned in a specialised facility to exacting tolerances, restores hydraulic precision across the entire transmission. 6-month warranty.
Put these four components together and you have a transmission system where every major part has been properly addressed. That is a transmission overhaul.
⚠️ For cars where multiple transmission faults have been logged, where symptoms have been present for an extended period, or where the transmission has accumulated high mileage without a full service history, addressing the system as a whole rather than component by component is almost always the more sensible and more cost-effective approach over the long term.
Gearbox Overhaul
Gearbox Overhauls / Transmission Overhaul
We use top grade components for maximum durability
Gearbox Warranty
Gearbox Overhauls with a 2 YEAR WARRANTY / 40,000km
Rebuilt to last over 100,000km under normal conditions
Gearbox Diagnosis
Diagnose your gearbox accurately for free
Let our experienced technicians help you
Gearbox Servicing
High quality workmanship, reasonable pricing
Original and OEM parts available
The Warranty Structure: Clear and Honest
We want to be upfront about this because it matters and some workshops are not clear about it.
A transmission overhaul involves components with different expected service lives and different warranty terms. Here is exactly what you get.
Gearbox Overhaul: 2-Year / 40,000km Warranty The gearbox rebuild covers all internal consumable components: clutch packs, all seals, all gaskets, transmission filter, and correct-specification transmission fluid. This portion of the work carries our standard 2-year / 40,000km warranty, the longest available in Singapore for gearbox work. Every gearbox we rebuild is built to last 100,000km or more under normal driving conditions.
Transmission Control Module: 6-Month Warranty Factory-refurbished unit. Bench-tested and verified before fitting. 6-month warranty covers the unit and the associated labour.
Torque Converter: 6-Month Warranty Factory-refurbished unit matched to your transmission specification. 6-month warranty covers the unit and the associated labour.
Valve Body: 6-Month Warranty Factory-refurbished unit reconditioned in a specialised facility with precision machining, solenoid testing, and bench verification. 6-month warranty covers the unit and the associated labour.
All warranty terms are documented in your quote before work begins. No ambiguity. No fine print you find out about later.
Why the Factory-Refurbished Units Matter
For the TCM, torque converter, and valve body, we do not use scrapyard parts and we do not use generic aftermarket alternatives.
Factory-refurbished means the unit has been disassembled, worn components replaced, critical surfaces machined back to specification, tested under controlled conditions, and verified against the original manufacturer’s performance parameters before it leaves the refurbishment facility.
This is a fundamentally different standard from a used part removed from a scrapped car. That used part has unknown history, unknown prior wear, and unknown remaining lifespan. It may have been on the shelf for months. The previous car it came from may have been scrapped precisely because the transmission failed.
Factory-refurbished units exist at the intersection of cost-effectiveness and reliability. They cost significantly less than new OEM units while delivering a standard of refurbishment that restores performance and allows us to back the work with a meaningful warranty.
This is the standard we apply across every TCM, torque converter, and valve body replacement in our transmission overhaul service.
Schedule a Transmission Overhaul
Signs That Your Car May Need a Full Transmission Overhaul Rather Than a Partial Repair
Not every car with transmission problems needs a full overhaul. Many are resolved through a gearbox overhaul alone, or a targeted valve body or torque converter repair. But there are situations where addressing the full system makes more sense than tackling components one at a time.
Multiple Simultaneous Fault Codes When a diagnostic scan returns fault codes across different transmission systems simultaneously, it suggests that the transmission as a whole has reached a point where multiple components are contributing to the symptoms rather than a single identifiable fault. Addressing them together is more efficient and more reliable than sequential repairs.
High Mileage With No Transmission Service History A transmission that has never been properly serviced accumulates wear across all its components at a similar rate. The gearbox internals, the valve body solenoids, the torque converter friction material, and the TCM calibration all degrade together. A full overhaul resets the entire system rather than leaving untouched components that are already significantly worn.
Symptoms That Persist After a Gearbox Overhaul Elsewhere If a gearbox was overhauled somewhere else and the symptoms returned, or if new symptoms developed after the overhaul, it points to the problem having extended beyond what the gearbox rebuild addressed. A TCM fault sending incorrect commands. A valve body still operating with worn solenoids. A torque converter continuing to contaminate fresh gearbox fluid with friction debris. These scenarios call for the broader scope.
Contamination of the Transmission Fluid When transmission fluid is found to be severely degraded, burnt, or contaminated with friction material debris, the contamination has circulated through every component in the system. The gearbox internals, the valve body passages, the torque converter, and the fluid circuits the TCM relies on for pressure feedback. Replacing the fluid without addressing the components that the contamination has affected is an incomplete repair.
Pre-Sale or End of COE Preparation Some car owners in Singapore want a complete transmission reinstatement before selling the car or extending beyond the COE. A full transmission overhaul with documented warranties on every major component provides a complete service record that adds genuine value and reassurance for the next owner.
💡 Real talk: A full transmission overhaul is a larger job than a gearbox overhaul alone. We tell you honestly during the diagnosis whether your car genuinely needs the full scope or whether a more targeted repair will achieve the same result. If a partial repair is the right answer for your car, that is what we recommend. We do not sell transmission overhauls to cars that do not need them.
What a Full Transmission Overhaul Involves
Step 1: Free Diagnostic Scan and Full System Assessment Brand-specific diagnostic equipment for your make and model. Full fault code read across the transmission control module, gearbox, and associated sensors. Physical assessment of transmission fluid condition. We build a complete picture of the system before recommending any scope of work. No charge. No obligation.
Step 2: Transparent, Itemised Quote You receive a full breakdown covering the gearbox overhaul scope, the TCM replacement, the torque converter replacement, the valve body replacement, and the associated fluid and filter service. Each component is listed separately with its cost and applicable warranty. You see exactly what you are paying for before we start anything.
Step 3: Gearbox Overhaul Complete disassembly of the gearbox. Every consumable internal component replaced: clutch packs, all seals, all gaskets, transmission filter. Rebuilt with original manufacturer parts or OEM-grade equivalents. This is the core of the job and carries the 2-year / 40,000km warranty.
Step 4: Transmission Control Module Replacement The existing TCM is replaced with a factory-refurbished unit matched to your specific transmission variant. The replacement unit is programmed and calibrated for your car as required. 6-month warranty.
Step 5: Torque Converter Replacement The existing torque converter is replaced with a factory-refurbished unit matched to your transmission specification. 6-month warranty.
Step 6: Valve Body Replacement The existing valve body is replaced with a factory-refurbished unit reconditioned in a specialised facility. Full solenoid replacement, precision machining, and bench verification as standard. 6-month warranty.
Step 7: Full Fluid and Filter Service Fresh correct-specification transmission fluid for your exact model. New transmission filter. The system is filled and checked before any testing.
Step 8: Adaptive Reset and Final Calibration Transmission control module adaptive learning values are reset to allow the TCM to relearn shift parameters with the new components rather than continuing to compensate for the characteristics of the old ones. Pressure adaptations are cleared. The system starts fresh.
Step 9: Road Test and Post-Overhaul Verification A thorough road test across a full range of conditions: low-speed manoeuvring, urban driving, highway cruise, and hard acceleration. Followed by a final diagnostic scan to confirm no fault codes remain across any part of the transmission system. The car does not leave until every system reads clean and the driving feel is correct.
Step 10: Collect with Documented Warranties Warranty documentation issued for each component at collection. 2-year / 40,000km on the gearbox overhaul. 6 months on the TCM, torque converter, and valve body. Clear and separate so you know exactly what is covered and for how long.
Most transmission overhauls are completed within 4 to 7 working days depending on the make, model, and parts availability.
Makes and Models We Cover
We carry out transmission overhauls across the full range of cars on Singapore roads. Both European and Japanese and Korean makes. All major automatic gearbox types including ZF units, Aisin-Warner units, Mercedes 7G and 9G-Tronic, and conventional AT gearboxes across the full model spectrum.
European Makes Mercedes-Benz across the C-Class, E-Class, S-Class, GLC, GLE and full range. BMW across the 1 through 7 Series and the complete X range. Audi conventional automatic models. Volkswagen conventional AT models. Volvo across the XC90, XC60, S60, S80, V60, V40 and others. Jaguar and Land Rover ZF automatic models. Porsche Cayenne and Panamera Tiptronic models. Maserati, Bentley, and Rolls-Royce ZF-derived units.
Note: DSG and PDK dual clutch systems do not use a conventional torque converter automatic layout and the transmission overhaul scope does not apply directly to these. DSG and PDK faults are handled through our dedicated DSG repair and PDK repair services.
Japanese and Korean Makes Toyota conventional automatic models outside the hybrid range. Honda conventional automatic models. Nissan AT models. Mazda SKYACTIV-Drive automatic. Hyundai and Kia conventional AT variants. Lexus non-hybrid automatic models. Infiniti AT models.
Not sure whether a full transmission overhaul is the right scope for your car? WhatsApp us your make, model, year, and what you are experiencing. We will advise honestly on what applies.
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Why Singapore’s Car Owners Choose 1 Car for Transmission Overhaul Work
We Assess the Whole System, Not Just the Gearbox. Most transmission problems that come to us have been partially addressed elsewhere. A gearbox overhaul that did not resolve the symptoms because the valve body was also faulty. A torque converter replacement that did not help because the TCM was sending incorrect commands. We look at the complete transmission system from the start and build the repair scope around what the system actually needs.
Factory-Refurbished Components. Not Scrapyard Units. The TCM, torque converter, and valve body we fit are refurbished in specialised facilities to exacting standards. Known history. Bench-tested. Verified before fitting. This is not the same as fitting a used part from a scrapped car and hoping for the best.
Clear, Separate Warranty Documentation. Two different warranty terms covering different components. We document each one separately so you know exactly what is covered. No vague claims. No finding out what the warranty actually says after the fact.
Singapore’s Longest Warranty on the Gearbox Overhaul Portion. 2-year / 40,000km on the gearbox rebuild. The longest available in Singapore. Every gearbox we rebuild is built to last 100,000km or more under normal driving conditions.
Transparent Pricing. Every Component Itemised. You see what each part of the job costs before we start. TCM, torque converter, valve body, gearbox overhaul, fluid and filter service. Each line item separate and clear. No bundled pricing that obscures where your money is going.
We Tell You If You Don’t Need the Full Scope. If a gearbox overhaul alone addresses your car’s faults, that is what we recommend. If only the valve body needs attention, that is what we say. We do not sell full transmission overhauls to cars that do not need them. The diagnostic scan determines the correct scope and that is what we quote.
Free Diagnosis. Free Towing. No Hard Sell. Drive in for a complete free assessment. If your car cannot make it safely, we can arrange towing. You get the full picture before you commit to anything.
2,000+ Transmission Jobs Behind Us. Every major automatic transmission type across every major brand on Singapore roads. We have seen every combination of faults, every presentation of transmission system degradation, and every variation of what a proper transmission overhaul involves. You are not the first car through the door with this problem.
Your Trusted Transmission Overhaul Specialist in Singapore
1 Car Service is Singapore’s trusted transmission overhaul specialist workshop, featuring a team of highly skilled gearbox technicians proficient in repairing transmissions of all makes and models. We provide the fastest turnaround times and offer the longest warranties in the industry, ensuring your transmission overhaul experience is both reliable and efficient. Choose 1 Car Service for your gearbox transmission Singapore needs and enjoy peace of mind knowing your transmission is in expert hands.
Questions People Ask About Transmission Overhaul in Singapore
What is the difference between a transmission overhaul and a gearbox overhaul? A gearbox overhaul rebuilds the mechanical internals of the gearbox: clutch packs, seals, gaskets, filter, and fluid. It carries our 2-year / 40,000km warranty. A transmission overhaul includes the full gearbox overhaul plus replacement of the transmission control module, torque converter, and valve body with factory-refurbished units. These three components each carry a 6-month warranty. The transmission overhaul addresses the complete system rather than just the mechanical core.
Why are the warranties different for different components? The gearbox overhaul uses original or OEM-grade parts installed by our technicians and is backed by our 2-year / 40,000km standard. The TCM, torque converter, and valve body are factory-refurbished units with their own refurbishment warranty of 6 months. These reflect the respective service lives and refurbishment standards of each component type. All terms are documented clearly before work begins.
Does my car need a full transmission overhaul or just a gearbox overhaul? This is determined by the diagnostic scan and the symptom picture. If fault codes and symptoms are isolated to the gearbox internals, a gearbox overhaul is the right scope. If the TCM, torque converter, or valve body are also showing faults, a transmission overhaul addresses everything in one job. We tell you which applies after the free diagnostic scan.
How much does a transmission overhaul cost in Singapore? The cost depends on the make, model, and specific transmission system. It is more than a gearbox overhaul alone because it involves four major component replacements rather than one. WhatsApp us your make, model, year, and symptoms and we will give you a realistic ballpark before you come in. The full itemised quote is provided after the free diagnostic scan.
How long does a transmission overhaul take? Most transmission overhauls are completed within 4 to 7 working days depending on the make, model, and parts availability for the specific factory-refurbished units required. We confirm the timeline after the diagnostic scan and keep you updated throughout.
What are factory-refurbished units? Units that have been fully disassembled, worn components replaced, critical surfaces machined back to manufacturer specification, tested under controlled conditions, and verified against original performance parameters in a dedicated refurbishment facility. Not scrapyard parts. Not generic aftermarket components. A standard of refurbishment that allows us to back the work with a meaningful warranty.
My car had a gearbox overhaul elsewhere but the problem came back. Could it be the TCM or valve body? Very possibly. A gearbox overhaul addresses the mechanical internals only. If the TCM was sending incorrect shift commands, if the valve body solenoids were causing hydraulic irregularity, or if the torque converter was contaminating fresh gearbox fluid, these faults would cause symptoms to persist or return after the overhaul. Come in for a free diagnostic scan and we will assess what is actually happening across the full transmission system.
Is the 2-year / 40,000km warranty really the longest in Singapore? Yes, for the gearbox overhaul portion of the work. Most workshops offer 1 to 6 months on gearbox work. Our 2-year / 40,000km warranty on the gearbox rebuild is the longest available in Singapore. The TCM, torque converter, and valve body carry 6-month warranties on the factory-refurbished units.
My car cannot drive. Can you arrange towing? Yes. WhatsApp us and we will arrange towing to our workshop at Sin Ming AutoCity. Do not drive a car with a serious transmission fault further than necessary.
Another workshop recommended a full transmission replacement. Is an overhaul a viable alternative? In most cases yes. A full transmission replacement from a dealer means a new or factory-remanufactured unit at significant cost. A transmission overhaul achieves the same functional outcome by rebuilding and refurbishing the components you already have. Your gearbox number stays unchanged for LTA purposes and the total cost is a fraction of a replacement unit. We will tell you honestly after the diagnostic scan whether an overhaul achieves the outcome your car needs.
