Reconditioned BMW 5 Series Gearbox

Which gearbox fits a BMW 5 Series between 2003 and 2010?

The answer depends above all on the engine unit, not simply the engine capacity. On this generation (E60/E61, 2003–2010), every engine variant listed here is fitted with a 6-speed manual gearbox, but the gearbox references vary according to the engine code stamped on the block — and the codes differ considerably from one engine variant to another, even where power outputs are similar.

Three engine variants, three distinct engine code families

The 2.0d covers three codes: M47D20, N47D20A and B47D20 — three successive generations of four-cylinder diesel engines whose associated gearboxes are not interchangeable. The 2.5 petrol covers M54B25, N52B25 and N53B25: the M54 is a six-cylinder from the previous generation, while the N52 and N53 belong to a different architecture featuring Valvetronic valve timing. The 3.0d diesel accounts for the majority of references in the catalogue, with codes 306D2, 306D3, 306D5 and M57D30 — all variants of the six-cylinder M57 with closely related mechanical characteristics but specific gearbox interfaces.

Identify the correct code before placing any order

On the 5 Series E60/E61, the manufacturer's plate and the engine marking are the only reliable sources for determining the exact code. The gearbox references listed here — including GS6-37DZ, GS6-45DZ and GS6-17BG depending on the engine variant — each correspond to a specific engine/torque combination. Confusing 306D2 with 306D5, for example, can result in ordering a gearbox that is mechanically incompatible despite externally similar casings. The available purchase options include exchange as well as a rebuilt-to-0-km option, depending on the reference.