Second Hand BMW 4 Series Transfer Box

Only the xDrive four-wheel-drive variants of the BMW 4 Series are fitted with a transfer box — it is the unit that splits drive between the front and rear axles. Rear-wheel-drive 4 Series models (sDrive or standard) do not have a transfer box at all, so if your car is a standard rear-wheel-drive model you will not find this part on it. Check your V5 or run a VIN check to confirm whether your car is an xDrive variant before searching for this part.

The BMW 4 Series has run across two main generations: the F32/F33/F36 generation from 2013 to 2020, and the G22/G23/G26 generation from 2021 onwards. xDrive four-wheel-drive variants were offered across both generations, and those xDrive models all carry a transfer box. Your engine code, found on your V5 or via a VIN check, is the most important detail to confirm when sourcing a used unit.

Both the 2016 and 2019 cars sit within the F32-generation 4 Series (2013–2020), so they share the same broad platform, but fitment still depends heavily on engine code and gearbox type rather than year alone. There was a facelift in 2017 that brought some mechanical revisions, so crossing that boundary is worth querying directly with the breaker against your specific registration and engine code. Never assume a match purely on year — always confirm with the breaker.

The F32 generation ran from 2013 to 2020 and the G22 generation from 2021 onwards, and these are fundamentally different platforms with different drivetrains, so a transfer box from an F32 car is very unlikely to be a direct fit for a G22 car. You should treat these as non-interchangeable generations and source a transfer box from the correct generation. Confirm the part number and engine code with the breaker against your registration to be sure.

Trim level alone does not determine which transfer box is fitted — what matters is whether your car is an xDrive variant, and if so, which engine code it has and whether it has an automatic or manual gearbox. An M Sport badge and a Sport badge on otherwise identical xDrive models with the same engine code will share the same transfer box. Focus on your engine code and gearbox type when speaking to a breaker, and set the trim level aside.

Whether a used transfer box requires any ECU pairing, adaptation, or coding to your specific vehicle is something you must confirm with the breaker or a BMW specialist rather than assume either way. Some xDrive transfer boxes may need configuration via diagnostics after fitting, depending on the model year and the control systems involved. Raise this with the breaker before buying so you can factor in any additional work required.