Cusco FD 4.556 Final Gear (86/BRZ)Fitment Guide: 86 BRZ, 12 21 DESCRIPTION Designed for the factory Toyota 86 Subaru BRZ 6 speed manual transmission, the close ratio gear set is ideal for keeping the power and torque band at its most effective region. The kit consists of a close ratio 1st and 2nd gear which prevents engine revolution drop during up shifting to keep the RPMs in the optimal range. Combined with a power ratio 4. 566 final gear, this is the most powerful modification that