Understanding Gearbox Codes is crucial for maximizing your MR2’s performance. European MR2s often suffer from a less engaging driving experience due to a 3.9 final drive ratio compared to the 4.3 found in US and Japanese models. This difference, particularly noticeable with a 2ZZ-GE engine, causes the engine to fall out of lift during shifts. European gearbox options, including those for Celicas and Corollas, also vary significantly. The common European 6-speed, the C63 from the Celica, presents a viable upgrade path.
Visually differentiating the C63 from the Celica C64 can be challenging. However, for those already equipped with a 6-speed transmission, swapping to a C63 or C64 is relatively straightforward. The process primarily involves exchanging the shifter shaft and mechanism. Affordability is another advantage, with C63 gearboxes occasionally available for around 100 euros, representing a significant performance enhancement per euro spent.
Acquiring a C60 gearbox in Europe requires a more involved approach. The most practical solution involves obtaining both a C64 and a C63. Subsequently, the 6th gear from the C63 is transplanted into the C64. This hybrid approach combines the desirable characteristics of both gearboxes, resulting in a C64 with a C56 LSD and the C63’s taller 6th gear for improved high-speed cruising. This specific configuration offers a balanced performance upgrade for the MR2.
Choosing the right gearbox code—C60, C63, or C64—significantly impacts the MR2’s driving dynamics. While the readily available and affordable C63 offers a substantial upgrade, creating a custom C64/C63 hybrid maximizes performance potential. Understanding these gearbox codes empowers MR2 owners to make informed decisions about optimizing their vehicles.
