A lot of people have already experienced this... the 3rd and 4th gear of the Toyota C64 can't cope very well with the stresses built up in races and on trackdays.
We know of people who had to change their gearbox every other raceweekend!

This gearset will replace 3rd and 4th gear and will also lengthen these gears slightly.

Ratio comparisons when used with standard final drive:

3rd Gear
- Std: 1.481:1 (max 90mph)
- This set: 1.438:1(max 94mph)

4th Gear
- Std: 1.166:1 (max 115mph)
- This set: 1.105:1 (max 122mph)