What is the construction and purpose of automatic transmissions?

Automatic transmissions are drivetrain assemblies mounted between the engine and subsequent drivetrain components. Their typical construction includes a housing, a gear set, a hydraulic system, electronic controls, and a torque converter or clutch packs. The transmission's task is to select the gear ratio according to driving speed and engine load without manual shifting by the driver.

What are automatic transmissions used for?

Automatic transmissions are used for smooth torque transfer and automatic gear shifting while driving. In practice, they affect the comfort of starting, accelerating, and driving in traffic jams, as well as cooperation with vehicle electronics. Without a properly functioning transmission, there may be delays in drivetrain response, jerking, or reduced vehicle performance.

What is the construction and function of a torque converter?

A torque converter is a hydrodynamic element connecting the engine to the automatic transmission. It consists of a housing, a pump impeller, a turbine, and a stator, and in many versions, also a lock-up clutch. Its function is to smoothly transfer drive during starting and to dampen sudden load changes.

How to check the compatibility of an automatic transmission with a vehicle?

The most reliable method is to compare the OEM number, transmission code, interchangeable numbers, and vehicle data via VIN. It is also worth verifying the fuel type, engine version, drivetrain type, and associated accessories, e.g., the controller or selector. This information helps avoid incompatibility during installation.

What symptoms indicate problems with an automatic transmission?

The most common symptoms include jerking during gear changes, delayed starting, noise, vibration, and transmission fluid leaks. In some cases, an emergency mode or failure to shift into a selected gear may also occur. Such symptoms should be checked against the condition of the oil, controls, and hydraulic components.

How to prepare an automatic transmission for installation?

Before installation, check the compatibility of markings, the condition of the housing, mounting points, connectors, and associated accessories. It is also good practice to check seals, oil cooling, and control elements. This makes installation smoother and reduces the risk of mismatch.

Automatic gearboxes

At Global Parts, we offer a wide selection of original used car parts, including automatic transmissions for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Our automatic transmissions undergo quality control to ensure you receive a top-quality product.

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Automatic Gearbox Mini Cooper S F56 F55 Petrol B46 B48 8685204 GA6F21AW WARRANTY

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BMW X3 E83 3.0d M57N2 Automatic Gearbox Transmission GA6HP26Z 7572500 WARRANTY

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BMW E60 E61 LCI 535d M57N2 Automatic Auto Gearbox GA6HP26Z 7590308 WARRANTY

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BMW X3 X5 Series E53 E83 3.0i M54 3.0d M57 Pressure Regulator Converter 7532013

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BMW E65 745i N62 Automatic Auto Gearbox 7521143 GA6HP26Z WARRANTY

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BMW X5 F15 B47 25dX Automatic Gearbox GA8HP50X 8665363 WARRANTY

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Mercedes W251 Automatic Gearbox 722902 722.902 A2512705600 WARRANTY

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Automatic Gearbox R60 R61 Mini Cooper D SD ALL4 2.0 GA6F21WA 9812766 WARRANTY

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Mini Countryman F60 B47B Automatic Gearbox 5A2AC13 GA8Q45HW WARRANTY

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Automatic Gearbox BMW F10 F11 535d F12 F13 640d N57Z GA8HP70Z 7636109 WARRANTY

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