Available in two ratios:
- Tulip, the original works rally ratios, having a large jump between 3rd and 4th gear, therefore needing a 22% overdrive to split the gap and effectively creating a 6 speed gearbox.
- Sebring which are similar to the works sebring race ratios, having a higher first gear with a close gap between all the gears, therefore only needing the overdrive on top to create a 5 speed gearbox. Today most people prefer the Sebring ratios as they are less confusing in a heated situation.

They are both manufactured solely for us with Molybdenum coated synchro cones to improve the synchromesh, giving a smoother and faster gear selection. These must run with BJ8 steel baulk rings. They are designed to run on a BJ8 main shaft and layshaft which can be installed into an earlier side or centre change gearbox (except BN1) with slight modifications to the centre case.