KAM 4.75, 4.1, 3.8, 2.83 RATIOS FOR LAND ROVERS

KAM Quality
All our 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 40 + types.

Largest Range Of Gear Sets In The World For The Land Rover
We were the first to produce alternative crown wheel and pinions and completed our initial research through a DTI development grant. 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.

4.75 Ratio	2.83 Ratio	4.1 Ratio	3.8 Ratio

Most of our gear sets are 24 splines on the pinion end with a M22 nut.

In recent years a company has copied our 4.1:1 ratio gear. This copied gear set is about £30 cheaper but we believe this has not had so much development work on the tooth form and attention to quality.

Please find below a list of our gear sets we currently produce for Land Rovers.

Shot peening and tooth polishing.
We are now offering a specials shot peening process and tooth polishing which increases the fatigue life of the gear set by +200% and Strength by + 30%.

The gear sets go through 3 operations. They are shot peened twice with 2 different media and then ultrasonic polished. The same processes are used on F1 gear sets.

We only recommended this if you have an engine that produces above 300 bhp and undertake professional racing.

We hold some gear sets in stock already shot peened. If we do not have stock then there is a 3 to 4 weeks lead time, as we have to have this type of work processed in batches.

The cost of shot peening is around £75 retail per gear set, if in stock

The cost of shot peening 1 off £105 per gear set.

Ratio Changes Original Ratio 4.7 3.54

Strength figures above are without shot peening.

Spacer rings
Depending on which carrier you are fitting ( 3.54 or 4.7 types) the ratio you fit may require spacer rings to fit behind the crown wheel to correct the offset of the original carrier. Typically if you fit KAM 4.75, 4.1, and 3.8 to a original Land Rover 3.54 carrier then you will have to fit a spacer ring.

3/8 24h UNF 1986 >	Spacer rings

KAM Crown wheel bolts
Crown wheel bolts are always recommended to be changed as they suffer fatigue. There are also 2 different types of bolt size:

We produce our own 3/8 24h UNF 12/9 strengthened bolts fine type which are also 4mm longer to compensate for the spacer ring when used.
These new bolts are each 2 tons stronger than the original Land Rover ones, which give a increase of 20 tons of shear strength from normal. They also have a longer plain portion under the head to give better support on the crown wheel body to the carrier.
Price £2.40 each 2000 in stock

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Pricing

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Tec Tip
1) Pinion Bearing
We would highly recommend to always change the pinion head bearing Land Rover part No: 539706, as it is very difficult to pull off the old pinion. This bearing is the same on all Land Rovers apart from S1 1949 to 1958

Pinion bearing did not change in any of the Land Rover cases other then S1 1948 to 57
Pinion head bearing 593706
Pinion tail bearing 593707

2) Fitment of the new bearing can be simply pressed on. A 6 inch length of scaffold tubing is just the right size to press the bearing on with.

Fitment: KAM gears fit straight in to Land Rover diff units. They also fit ARB, Detroit, or True-Trac units.

Shipping Weight: Total shipping weight for 2 off set's is 10 to 12 kg.