BMW Gearbox Parts: Common Components and What They Do
Image: BMW 3 Series Complete Rear Wheel Hub for sale at MT Auto Parts for £284.28 Most BMW owners never think about what is actually inside the gearbox until something goes wrong. A hesitation between gears, a jolt when selecting Drive, a vibration under acceleration, or a warning message that puts the car into a protective mode. Understanding the main components makes it easier to follow a specialist's diagnosis and, just as importantly, understand why one fault might require a relatively small repair while another could mean replacing the complete gearbox. BMW has used several automatic transmission families across its range. ZF 6-speed and 8-speed automatic transmissions are particularly common across newer BMWs, although the exact transmission depends on the model, engine, drivetrain and production specification. ZF's 8HP family itself includes numerous variants, including 8HP45, 8HP50, 8HP70, 8HP75 and 8HP90 applications. This guide explains the main components found in a ...
