Quaife is the biggest supplier offering a 3 gear kit or a 5 gear straight cut kit. It needs to be stated somehow these are never straight forward to fit. Something often needs adjustment or shimming to get these fitting correctly. They also offer a 3.9, 4.2 or 4.465 final drive.
A 3 gear kit designed and race tested to be far lower and closer ratio than any stock gears. If a further reduction in gearing is required I now offer a 4.5 final drive.
The 4.5 final drive output shaft - standard spec only
UCR Gear Ratios: 3rd 1.461, 4th 1.222, 5th 1.034
Low UCR Gear Ratios: 3rd 1.561, 4th 1.308, 5th 1.034