WCB - Technical Bulletin

UNDER CONSTRCUTION

KAM 4.75, 4.1, 3.8, 2.83 ratios for Land Rovers

We are a major manufacturer of Motor Sport, Land Rover and Vintage vehicle crown wheel and pinions, and we have been selling our gear sets worldwide over the past 14 years. We have supplied Ford Motor Sport (Boreham) and Land Rover (Solihull) direct with crown wheel and pinions for special projects and contracts. We now have an extensive network world wide of distributors for the supply and fitment of our gears sets. Please see our website for your local distributor Link: http://www.kamdiffs.com/distributors.htm

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 paten 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

Link to 4.75: http://www.kamdiffs.com/landrover_4_75.htm

In recent years a company has copied our 4.1:1 ratio gear. This copy gear set is about Ł30 cheaper but we believe this has not had so much development work on the tooth form and attention to quality. The 4.1 ratio is now supplied with a M22 nut on the pinion and has 24 splines on the flange cuplink.

We are currently looking at producing a 5.1 ratio and would like comments from our customers / distributors if this would be a useful gear set.

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

Ratio Strength Increases

4.75 Land Rover gear set are 50% stronger

4.1 Land Rover gear set are 25% stronger

3.8 Land Rover gear set are 70% stronger

2.83 Land Rover gear set are 28% stronger

Ratio Changes Original Ratio 4.7 3.54

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.

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.

Course 1948> to <1986, 237339

Fine UNF 1986 > FTC 3586

KAM produces there own 12/9 strengthened bolts fine type which are also 4 mm longer to compensate for the spacer ring when used.

These new bolts are each 2 tonnes stronger than the original Land Rover ones, which give a increase of 20 tones of shire strength from normal. They also have a longer plain portion under the head to give better support on the crown wheel body.

Price Ł1.90 each

New stock August 2005

Shot peening and tooth polishing.

We are now offering shot peening and tooth polishing which increases the fatigue life of the gear set by +200% and Strength by + 30%. We only recommended this if you have an engine that produces above 300 bhp and undertake professional racing.

We hold some gear set's in stock already shot peened. If we do not have stock then there is a 4 to 6 week lead time, as we have to have this type of work processed in batches.

The cost of shot peening is around Ł75 per gear set, if in stock

The cost of shot peening 1 off Ł105 per gear set.

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

Pricing

Crown wheel and pinions Ł223 (except 4.75 which is Ł230)

Spacer rings are Ł23 each.
KAM Crown wheel bolts at Ł1.90 each x 10 per gear set.

Bearings 539706, 539707, 41045, RTC 2726, RTC 3095 all Ł17.50 each

Tec Tip

We would highly recommend to always change the pinion head bearing, 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

Fitment of the new bearing can be simply pressed on.

Total shipping weight for 2 off set's is 12 kg.

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