Used BMW 8 Series Gearbox

The modern BMW 8 Series (G15 coupe, G14 convertible, G16 Gran Coupe) ran from 2018 onwards, so gearboxes from within that generation are your starting point for compatibility. Fitment depends far more on your engine code than the model year alone — the M850i xDrive with its N63 V8 and the 840d with its B57 straight-six take entirely different gearboxes despite sharing the same body. Always supply your engine code (found on your V5 or via a VIN check) to the breaker before agreeing a price.

Both fall within the same G-series generation (2018 onwards), so there is a reasonable chance of compatibility if the engine codes match exactly. However, BMW did introduce running production changes within this generation, and whether ancillary brackets or mounting points differ between a 2019 and 2022 unit is something you should confirm with the breaker against your registration rather than assume. Give the breaker both the donor and recipient engine codes and your reg so they can cross-reference before you commit.

No — these are different engines entirely. The 840i uses a straight-six petrol (B58 engine code) while the M850i uses a twin-turbocharged V8 (N63 engine code), meaning the gearboxes are not interchangeable. Always match on engine code rather than badge or trim level, and tell the breaker your exact code so they can pull the correct unit.

The 840d and 840d xDrive share the same B57 diesel engine, but the xDrive all-wheel-drive variant uses a different gearbox configuration to accommodate the transfer case. This is a genuine fitment difference, so make sure you tell the breaker exactly which drivetrain you have — rear-wheel drive or xDrive — as well as your engine code, and they will match accordingly.

Trim levels like M Sport, M Sport Pro, and individual on the 8 Series are cosmetic and equipment packages; they do not change the gearbox fitted to the car. What determines the correct gearbox is your engine code and drivetrain layout, not the trim badge. You may find minor cosmetic differences between donor and recipient cars (different interior finishes, for instance) but these are irrelevant to gearbox fitment.

This is an important question and one the breaker is best placed to answer for your specific situation, so confirm it with them against your registration before buying. What is well established is that you should supply your engine code, year, and full VIN details to the breaker so they can advise on whether any programming work will be needed after fitting.