New 5th gear set, drive and driven for 5 speed C series transmissions. The ratio on this is .725, lending an 11% reduction in cruising RPM for AW11 and ZZW30 use. Can be installed without removing the transmission from the car.

AW11 owners should also purchase a new 5th gear synchro as well as hub and slider. This combination of parts will fix the 5th gear pop out issue.

ZZW30 owners can install this upgrade and reuse their existing synchro, hub and slider.