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For the 8-speed automatic transmission, ZF set out to design and develop an entirely new gear set concept. The result is a revolution in transmission design: a transmission concept with 4 gearsets which requires only 5 shift elements – of which only two are open in any given gear. The launch gear is almost like the first gear in a regular automatic transmission. As the vehicle speeds up, the transmission will switch this out, so it starts working as a CVT. If you're a control freak, late-model electronic transmissions are just what you need to modernize your classic car, and if you decide to go that route, a transmission control module is a must-have.

Most modern automatic gearboxes have a set of gears called a planetary or epicyclic gear train.

A planetary gear set consists of a central gear called the sun gear, an outer ring with internal gear teeth (also known as the annulus, or ring gear), and two or three gears known as planet gears that rotate between the sun and ring gears.

The drive train is coupled to a mechanism known as a torque converter, which acts as a fluid drive between the engine and transmission.

If the sun gear is locked and the planets driven by the planet carrier, the output is taken from the ring gear, achieving a speed increase.

If the ring gear is locked and the sun gear is driven, the planet gears transmit drive through the planet carrier and speed is reduced.

With power input going to the sun gear and with the planet carrier locked, the ring gear is driven, but transmits drive in reverse.

To achieve direct drive without change of speed or direction of rotation, the sun is locked to the ring gear and the whole unit turns as one.

A torque converter is a fluid coupling that acts like a clutch, except that drive is by hydraulic pressure.

The converter has three main components - the impeller, bolted to the flywheel; the turbine, connected to the gearbox input shaft; and the central reactor between the two, which has a one-way clutch called a freewheel.

As the engine speed is increased, the centrifugal force acting on the hydraulic fluid via the impeller vanes transmits the torque, or turning effort, to the turbine.

The central reactor converts this turning effort by redirecting the flow of fluid back to the impeller to give higher torque at low speeds.

Once the engine speeds up and develops more power, the need for this torque amplification decreases and the reactor freewheels. The torque converter then acts as a fluid flywheel, connecting engine to gearbox.

The main components of a torque converter are shown in the diagram - the impeller, reactor (or stator) and turbine.

The smaller diagrams show the direction taken by the hydraulic fluid under centrifugal forces.

The same effect can also be achieved by locking the planet gears to the planet carrier.

Most automatic gearboxes have three forward speeds, and use two sets of epicyclic gears.

The locking sequences of the epicyclic gear train are achieved by hydraulic pressure operating brake bands or multi-plate clutches.

The bands are tightened round the ring gear to prevent it turning, and the clutches are used to lock the sun gear and planets.

The correct sequence of pressure build-up and release is controlled by a complex arrangement of hydraulic valves in conjunction with sensors that respond to engine load, road speed and throttle opening.

A mechanism linked to the throttle - known as a kickdown - is used to effect a change-down for rapid acceleration. When you press down the accelerator suddenly to its full extent, a lower gear is selected almost instantly.

Most automatic gearboxes have an override system so that the driver can hold a low gear as required.

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Automatic Transmission Replacement, Servicing & Reconditioning

Automatic Transmissions can provide a complete range of automatic gearbox repairs for all car makes and models. We regularly refurbish and replace gearboxes for Ford, Volkswagen, Mercedes-Benz, BMW, Audi, Chevrolet, Citroen, and Renault vehicles… and many more besides!

Whether you have have an automatic saloon, hatchback, 4×4 or performance sports car, you can count on us to resolve your gearbox problems.

Download coachlab 2 usb devices driver. Our mechanics and engineers have more than 35 years’ experience in repairing and replacing auto gearboxes across the UK. From our independent garage in Huddersfield, we can provide reliable automatic gearbox repairs to modern and older vehicles. Thanks to our diagnostic equipment and expertise, we can identify any problems you might experience with an automatic gearbox in the UK. Mousemaestro mice & touchpads driver download.

Your One-Stop Auto Gearbox Repair Service

We’re proud to offer automatic gearbox repairs throughout West Yorkshire and even further afield!

Although we’re based in Huddersfield, our engineers are happy to work on vehicles from across the UK. If you’re within 100 miles, our mechanics can also provide a collection and delivery service for your automatic vehicle.

We Supply and Fit Refurbished Auto Gearboxes

Our highly skilled mechanics can install our premium refurbished gearboxes into vehicles anywhere within a 60 mile radius of Huddersfield. Simply get in touch with a description of the issue and we will provide the right automatic gearbox solution, allowing you to get back on the road with a minimum of fuss.

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Unparalleled Expertise and Service – Get in Touch for All Your Automatic Gearbox Needs

Thanks to our team’s experience, and industry-leading technology, we can carry out all manner of auto gearbox repairs and replacement services. Where required, we can replace seriously damaged units with reconditioned alternatives to suit your needs.

Our knowledgeable team are here to help with all your automatic gearbox requirement. Get in touch on 0800 980 9614 today to discuss your requirements and arrange a free quotation!

• • Over 35 Years’ Experience!
• • 400+ Reconditioned Gearboxes in Stock: That Means No Waiting!
• • Up to 2-Year Guarantee Available
• • Competitive Prices!
• • We Will Beat Any Genuine Written Quote!
• • Cost-Effective Auto Gearbox Repairs / Replacement!
• • We Only Use Genuine Parts
• • Access to the Latest Diagnostic Equipment – The Same High-Quality Service You’d Expect From a Main Dealer.
• • Free Courtesy Car

• • We Can Supply and Fit a Wide Range of Automatic Gearboxes for All Leading Manufacturers
• • Like-New, Reconditioned Automatic Gearboxes Available
• • Complete Repairs for Electronic Units
• • Free Diagnostic Checks When Your Vehicle is Left for Repair (if not the charge will be £60 + vat)
• • Free Collection & Delivery Within 50 Miles (distances further than this will attract a small charge)
• • Specialists in ZF Auto Gearboxes & DSG Gearbox Repair!

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