New 5-Speed Quaife Synchromesh Gearkits for Mazda Miata and RX-7. Heavy Duty, semi-helical, close ratio gearsets are available in two configurations for both performance street and race applications. Available for 1.6 and 1.8 Miata and RX-7. Quaife 5 speed Gearset for 1990-2005 Miata and 1981-1992 RX-7. Also fits 2006-2007 MX-5 5 speed box with slight modification. Available in two different ratio sets. Installation is available by AWR for $595.00. RATIO SET 2 2.350 1.550 1.240 1.000 0.886