Second Hand Mazda 6 Gearbox

These sit in different generations — the Mazda 6 GH ran from 2008 to 2012, while the GJ generation ran from 2012 onwards with a facelift around 2015 — so a 2010 unit crosses that boundary and is unlikely to be a direct swap. The most reliable way to confirm compatibility is to match the engine code from your V5 or a VIN check, then have the breaker verify the codes align. Never assume a gearbox fits across a generation change without that check.

Trim level does not affect gearbox fitment on the Mazda 6 — what matters is the engine code, fuel type, and whether you have a manual or automatic. SE, SE-L, Sport Nav, and GT Sport trims sharing the same engine and gearbox type will use mechanically identical units, so you do not need to seek out a gearbox from the same trim. Do be aware that cosmetic differences between donor and recipient cars are irrelevant to whether the gearbox itself will fit.

The single most important piece of information is your engine code, which appears on your V5 logbook or can be found via a VIN check — this tells the breaker far more than the year or trim badge alone. You should also confirm your fuel type (petrol or diesel) and whether you have a manual or automatic gearbox. Having your registration to hand lets the breaker cross-reference everything and helps avoid ordering a unit that will not suit your car.

Both years fall within the GJ generation (2012 onwards), with the facelift arriving around 2015, so on the surface these look close. However, confirm the engine codes match exactly, as Mazda made incremental changes during the GJ production run and ancillary or mounting details can vary in ways that are not always obvious — confirm this with the breaker against your registration before purchasing. A matching engine code is your strongest indicator of compatibility.

No — a diesel gearbox and a petrol gearbox are not interchangeable on the Mazda 6, as they are engineered around different torque outputs, bell-housing configurations, and drive ratios. Always make sure the donor gearbox matches your fuel type as well as your specific engine code. Tell the breaker both details upfront to avoid any confusion.

This depends on your specific car and the unit you are buying, and it is not something we can state as a blanket rule — confirm the position on coding and pairing directly with the breaker against your registration. Some vehicles require electronic modules associated with the gearbox to be matched or recoded to the receiving car, and a good breaker will be able to advise on what is needed for your exact engine code and model year. Factor any potential coding work into your budget before committing.