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Transmission Repairs


Transmission Repairs

If you are experiencing issues with your vehicle’s transmission, be it manual or automatic – give us a call at AAG Automotive on (07) 3741 2812. In doing so, you will save money on expensive quotes from dealerships and other mechanics who often lack the capabilities to service the complex transmissions found in today’s cars.

Today’s transmissions have become highly technical, computer-controlled systems. We’re one of the few places that have invested in the latest factory diagnostic equipment. Our specialised knowledge and equipment allow us to diagnose and repair all types of automatic transmissions accurately.

Today’s Automatic Transmissions

Automatic transmissions have taken over as the prime choice for most drivers around the world. Convenience, hassle-free shifting, and accessibility have risen above the use of traditional three-pedal shifters. While automatic transmissions started as simple gear changing mechanisms that were known for less than stellar fuel economy, years of development have catapulted the automatic as the transmission of choice for performance and efficiency.

Quicker gear shifts compared to manual offerings have made several manufacturers drop the stick as an option for performance vehicles, relying on the computer and a myriad of sensors to decide optimum points of upshifts and downshifts. Also, smarter computers and sensors have created automatics that prioritise less power and proper gear selection for maximum fuel savings.

On the surface, it may seem that automatic transmissions are limited to just automatic gear selection, but there are many variations that are used in almost all types of vehicles. Let’s take a look at each kind, highlight their characteristics and learn a thing or two about their applications.

Traditional Automatic Transmission

More known as a torque converter automatic, this widely-used automatic transmission can be found in almost every car. This transmission uses a hydraulic fluid coupling or a torque converter to do the job of changing gears instead of a clutch. The ECU (Engine Control Unit) is directly connected to this mechanism to allow smooth and precise engine control of the vehicle.

Automated-Manual Transmission

You may know this a semi-automatic transmission, but it goes by many other names. This type of automatic transmission uses a regular clutch and gear configuration but makes use of sensors, actuators, processors, and pneumatics to simulate manual gear use. These types of vehicles are known for jerky engine performance at low speeds and hard acceleration but can get high fuel mileage over long distances.

Continuously Variable Transmission (CVT)

Using belts or pulleys instead of traditional steel gears, a continuously variable transmission allows for seamless gear shifting with various ratios dependent on engine speed or RPM. This allows for maximum efficiency and continuous acceleration, which is good for fuel economy. However, engine noise can be loud.

Dual-Clutch Transmission (DCT)

A combination of an automatic and manual transmission, a dual-clutch transmission has no torque converter. Instead, it uses two separate shafts with their own clutches for gear changing, one for odd-numbered gears, and one for even-numbered ones. Shifting to higher and lower gears are seamless, but they can get noisy and shift roughly after wear. The DCT is a dry transmission that removes the need for manual changing of the gearbox fluid. It leaves the clutches dry, but eventually, the frictional quality will wear out.

DSG (Direct Shift Gearbox)

Using a similar setup to a dual-clutch transmission, a Direct Shift Gearbox (DSG) uses two clutches that disengage alternately in changing gears. This setup offers fast-shifting and smoother acceleration. Modern systems also provide fuel efficiency that surpasses manual gearboxes. A DSG system is a wet transmission, so expect decades of service as long as the fluid is changed regularly.

Tiptronic Transmission

Usually used in performance or sport-oriented vehicles, and also known as “manumatic”, the Tiptronic transmission was pioneered by Porsche in the ‘90s. It functions similarly to a manual gearbox; however, it uses a torque converter in place of a clutch pedal. There is an option for automatic shifting of gears and an opportunity for the driver to override the automatic mode for manual selection of gears. There is a built-in safety feature that prevents the driver from damaging the gearbox through over-revving when downshifting.

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    2/9 Virginia Street,
    geebung, Qld 4034
    (07) 3741 2812