We specialise in the supply of exchange rear axle differentials and differential kits for Rolls-Royce and Bentley Cars produced between 1945 – 1965, to over 40 countries. On occasion we have also overhauled a small number of Bristol Car 400 series axles, but this is not our main business. As enthusiasts of these cars we realise the value of specialising in one main component, which also leaves us clear to develop our own special tooling for testing and rebuilding these axle differentials.
For the European market, including Great Britain we supply exchange differentials or we can rebuild the customer’s own axle differential by arrangement. The exchange units are supplied ready for the customer, or his garage, to fit.
For Africa, Australia, Canada, New Zealand, North and South America and other World wide zones we supply either complete axle differential rebuild kits, exchange differentials, or we can rebuild the customer’s own axle differential.
We do not usually supply individual axle differential spare parts, except to existing axle customers.
We can supply our axle customers with auxilliary items that they may need when replacing the centre axle unit, at VERY exclusive prices. These can, depending on model, include shock absorber bushes, brake equaliser rubber bushes, exchange sets of axle bolts nickel plated, exchange brake back plates copper plated ready for paint, brake rod water excluders and wheel bearings.
We use a number of genuine Crewe Parts and, in other instances, all replacement parts will either meet or exceed the original specification. All main hypoid gears are manufactured to Gleason standards on their machines.
We can advise on the calibration adaptor parts and the specific gear tooth sizes needed to recalibrate a speedometer when the axle ratios are changed, although we do not deal in these parts.
In nearly every instance we replace the axle pinion housing with a much heavier duty application. This arrangement is unique in our units and assists in eliminating some of the original axle problems and noise that have existed over the years.
All exchange differentials are converted to accept a modern oil seal at the front that cannot be seen externally. One of our last tests before dispatch is to fill the axle with oil and stand it on its drive flange for 24 hours…no oil must leak.
Normally we have a number of exchange axle differentials in stock, with different ratios on certain models, to suit our customers’ needs. In the case of exchange axle differentials we accept delivery of the old unit before dispatching the rebuilt unit. In England we normally deliver the unit direct to the customer’s door or premises and pick up the old unit at the same time.
Every exchange differential is supplied with a two page rebuild sheet that records every detail of that axle rebuild including the thickness of every spacer.
For the European market, by arrangement, we can supply one of our rebuild kits and fit a customer supplied BDC gear set to the customer’s own axle or one of our own units. The latter enables the customer to arrange to swap over the axle quickly. This arrangement is usually dependent on two main conditions, as follows.
All our exchange differentials are fitted with taper bearing pinion assemblies and on NO account whatever will we refit a Bentley MkVI triple bearing arrangement, but in every case the pinion bearings and the pinion housing are converted to tapers. The customer supplied gear set must have only been produced on the original type machines and the gears must be capable of meeting our own quality inspection. We do not carry out any machining or manufacturing ourselves, we use experts for those exercises who have the specialised knowledge and skills, together with the right machines. These specialists have worked with us for a number of years so that together we can offer extremely generous guarantees on our rebuilt axles……..just ask. In the case of special chassis that have none original engines or extended rear axle tracks, we do normally limit that guarantee to one year. Any guarantee is offered on the basis that the rear wheel bearings have been renewed simultaneously with the differential change. We invite customers to inspect any of our parts or axle assemblies. We do not charge for small incidental breakages of old parts. However we do expect to be able to recycle the main parts of the old unit and reserve our right to charge for unusable cases and smashed pinion and bevel gears. This excludes the main hypoid gears, which are usually broken.