Second Hand Mazda RX-8 Differential

The RX-8 was produced as a single generation from 2003 to 2012, with a significant facelift arriving in 2008 that brought changes to the engine and ancillary components. Differentials from pre-2008 cars may differ from post-2008 units in spec, so while the platform is shared across the full run, confirm with the breaker whether the exact unit from the donor car crosses that 2008 facelift boundary cleanly against your registration. The engine code stamped on your V5 or from a VIN check is the single most useful detail to give them.

Yes, the higher-output 231 bhp version of the Renesis rotary engine (code 13B-MSP in its high-power state of tune) was paired with a six-speed manual gearbox, while the 192 bhp version was available with either the six-speed manual or the four-speed automatic, and the differential specification can vary accordingly. Always quote your engine code and gearbox type to the breaker so they can match the correct unit rather than relying on the power figure alone. Never assume a differential from one output variant will drop straight into another without checking.

No — the automatic and manual RX-8 use different drivetrain configurations, and the differential from an auto car is not a straight swap into a manual car. Always tell the breaker exactly which gearbox type your car has, alongside the engine code from your V5, so they can source the correct unit from a matching donor. Fitting the wrong diff type is not just a compatibility issue but could affect handling and safety.

For the differential itself, trim level — whether your car is a standard, PZ, SE2, or the sportier R3 — does not affect fitment, as the mechanical drivetrain components follow the engine code and gearbox type rather than the badge on the tailgate. That said, confirm with the breaker whether the donor car's diff spec matches your engine code and gearbox, since those are what matter. You should not pay extra or less for a differential simply because it came from a higher or lower trim car.

A 2006 car is pre-facelift and a 2009 car is post-facelift (the facelift arrived in 2008), so there is a generation boundary between these two donor years that may have brought ancillary or mounting changes. The engine code and gearbox type from both vehicles should be your starting point, and you must confirm with the breaker whether the specific pre-facelift unit is compatible with your post-2008 car against your registration before purchasing. Do not assume fitment based on year alone.

Give the breaker your full registration number so they can run a VIN check, and also quote the engine code directly from your V5 logbook — for the RX-8 this will identify whether you have the high-power or standard Renesis rotary variant. Also confirm whether your car has the six-speed manual or four-speed automatic gearbox, as this directly affects which differential is correct. The more precisely you can describe the donor and recipient vehicles, the better the breaker can match the right part and advise on any ancillary differences.