The KAM crown wheel and pinions are unique in design. The crown wheel has cast into it a thicker outer edge to reduce the crown deflection off the pinion in extreme conditions. Thus they state they are up to 70% stronger in some cases.

KAM is the only company in the World to offer a range of alternative ratios that have been specifically designed for the competition and military Land Rover applications. A choice of ratios to suit the varying engines and tyre sizes used around the world.


If you are increasing the payload of the vehicle then the gearing dynamics need to be changed. With the ratios below, we can offer both speed reduction and speed increase to suit your application combined with considerable extra strength of the gear

3,54 is the standard ratio from Land Rover with KAM ratios fitted you can see from the table the changes that are possible.

The torque increases are calculated by using the standard gears as a datum. Input torque is produced by the engine power put into the differential and output torque is produced by the feedback into the differential from traction obtained.

Land Rover

3.8 ratio up to +70% in engine motor torque

3.8 ratio up to +50% in tractive effort at road

Reverse rotation Crown wheel and pinion for front axlesThe teeth on gear sets have both a drive side and a coast side. Usually the pinion should rotate the crown wheel on the drive side of the tooth. If however the pinion rotates the crown wheel on the coast side, strength of the gear set can be reduced by about 20%.

In the front axle of a Land Rover, the gear set is running backwards, being driven on the coast side of the teeth rather than the driven side and as such is weaker. KAM have produce reverse rotation gear sets to allow the gears to be driven in the correct way and introduce the designed strength back into the gears. This also allows the pinion to transfer that load forces into the bigger pinion head bearing rather that the smaller tail bearing, such increasing the life of the bearings.

Shot peening adds 30% strength to the tooth form. 300% to fatigue life.

Cryogenic thermal treatment increases the wear life of the tooth form.

KAM Quality
The gear set are made from the best steels and are made from dedicated drop forgings. Heat treatment is carefully controlled and each gear set is matched and calibrated in a Gleeson lapping-in machine for optimum set up. In this process, lapping paste is applied to each gear set and then run up to speed until a perfect tooth contact pattern is achieved. This process produces a perfect matched gear set. The pinion deviation is then calibrated and marked on the pinion end of each set. All these process combined produce very high quality, stronger and reliable gear sets in our range of 50 + types.

Largest Range Of Gear Sets In The World For The Land Rover
KAM were the first to produce alternative crown wheel and pinions and completed our initial research through a DTI development grant IN 1991. We spent 6 months working on 3 different ratios to gain strength and a range of gears sets that are required for today's engine BHP enhancements and off road ratio requirements. In 2001 we added the 4.75:1 ratio to the list of gear sets. This is now one of our best sellers in the Land Rover range, being ideally suited to the SIMEX type tyres. The KAM gears are now fitted world wide to competition heavy duty and military vehicles.