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Technical / Sale Enquiry Form

Please complete the form below:

Name:
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Make:
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Enquiry:
Are you able to get your vehicle to one of our branches nationwide, for a free diagnostic service?

Or will you prefer to purchase a loose gearbox?

Would you prefer to buy another gearbox, or do you have time to send yours in for repair?

Which warranty would you require?

Would you be able to get your old failed gearbox back to us (At your own cost)?

Who would you use to remove and fit your gearbox?

Can you provide us with an engine code and/or gearbox code (You may have to ask a technical person for these details)?

Great! Please visit any of our branches for a free diagnostic test while you wait.
If you cant make a trip right away and would like to know more about what the job might cost, or how long it will take, please answer the questions below:

Would you prefer to buy another gearbox, or do you have time to repair your gearbox and possibly save money?

Which warranty would you require?

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Mayfair Gearbox's 23 Years In Business

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Synchromesh Gearboxes: How It Works

Early cars required much more skill from the driver than do modern machines. One of the major skills that the driver had to obtain was that of changing gear smoothly and silently. Initially, gear changes were exaggerated by sliding one gear out of mesh with another and then appealing another pair of gears. The small clearance amid the sets of teeth demanded that the speeds of the gears that were to be engaged had to be precisely synchronised if noise and damage were to be evaded.


This trouble meant that the driver had to master the method of ‘double declutching’, a skill which is still of worth to drivers of cars that have no synchromesh amid first and second gears. The point of double declutching is to synchronize the speed of the input shaft and, so, on layshaft gearboxes, the layshaft with the speed of the output or main shaft, so that the gears can be efficiently and quietly engaged.


The principles of synchromesh are quite simple. The actual mechanical particulars of the various systems, however, are a good deal more multifaceted but, essentially, synchromesh is really an improvement on the dog clutch. Dog clutches were the next stage in the development of the gearbox, once the problems of sliding pinion engagement had developed. In its place of sliding the gears in and out of mesh, the dog clutches locked each gear to the main shaft when the gear lever was moved in the right direction. Although an upgrading, dog clutches also suffered from the need for precise synchronisation and synchromesh systems were intended to automatically modify the speed of the dogs to permit easy engagement.

Fundamentally, engagement of the dogs is headed by contact between two friction surfaces, usually an external and an internal cone. This interaction, made by the primary movement of the gear lever, inclines to synchronise the speeds of the two friction cones, thus allowing easy engagement of the dogs when the gear lever is moved fully home. The change in rotational speed, due to the frictional contact, always occurs on the input shaft due to the output shaft, being connected to the driving wheels, rotates at a rate that is resolute on the road speed of the car. The speed of the cone attached to the output shaft is consequently unaffected by the contact. The speed of the cone on the input shaft is thus raised or lowered to match that of the output shaft.

Quick Facts

Who We Are

Mayfair Gearbox is a National and International supplier of fleet reman gearboxes, diffs and propshafts. We are led by a Management Team of true industry professionals who have pioneered the gearbox remanufacturing industry. Mayfair Gearbox has been established for 20 years in the Industry.

What We Do

Mayfair Gearbox is the solution to limit your fleet’s downtime! We are quality driven to provide only the finest remanufactured gearboxes, diffs and propshafts.

What Makes Us The Best

Commitment and integrity to provide outstanding quality, exceptional service and support at all times, to you our valued Customer. Approved by most manufacturers and a National Footprint of 14 Branches.


Product Division

Heavy Commercial & Buses
Truck Gearbox Repairs Bus Gearbox Repairs
Earthmoving 4 x 4
Earthmoving Gearbox Repairs 4X4 Gearbox Repairs
Passenger Manual Passenger Automatic
Manual Gearbox Repairs Automatic Gearbox Repairs


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Remanufacturing = Sustainability + Efficiency

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Mayfair Gearbox's 23 Years In Business

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