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Technical / Sale Enquiry Form

Please complete the form below:

Engine Type:
Transmission Type:
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?

8 - 3 =

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Mayfair Gearbox's 23 Years In Business

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Constant-mesh Gears

In the early days of motor transport, changing gear was a gentle operation requiring substantial skill. Straight-cut gears had to be matched in speed afore being brought into mesh together. The result was as often as not a horrifying grinding noise; crashing the gears, as it was recognised.

Straight-cut crash boxes were very loud, wore rapidly and tended to shed teeth at difficult moments, so it was not long before engineers started to investigate with other approaches, most notably helical gears in constant mesh. It is well worth accepting how this procedure works - it will make you a better driver, well, assuming you do drive a car with manual transmission.

Helical Gears:
You know what a straight-cut gear looks like: it is the classic cog, as seen on bike sprockets, watches and clocks. It is simple to make, but the bearing surface is narrow. This has two effects: it wears quickly and it is loud, as it wears the gears fit less well, and each new tooth coming into mesh fundamentally hits its companion tooth and is braked sharply until it fits into the necessary gap.

The Constant-mesh System:
Helical gears are great when they are in mesh, but they are much better and bringing them together on the fly deprived of damage is not conceivable. The progress of helical gears required the use of a continuous mesh system. But how can all the forward gears be in mesh concurrently without it ending in tears? The answer is elegant and simple - easy to draw but brutally difficult to describe.

Helical gears are cut on the slant, a bit like screw filaments. Imagine a long bolt with the head detached; now bend it into a ring. The outer edge of this ring is a rudimentary helical gear. Helical gears have a longer bearing surface, which diminishes the wear problem, and, fatefully, each tooth comes into mesh while its forerunner is still in contact so there will be two teeth in mesh at any time. Instead of the continuous judder of teeth banging into each other we have a silky-smooth development from one tooth to the next.

To set the act: a gearbox has an input shaft which is linked to the clutch. This is how power goes into the gearbox; the engine turns the input shaft when the clutch is engaged. The gearbox performs its magic and power comes out on an output shaft, which can run at a diverse speed from the input shaft. The motive for doing this is so that the engine can remain within its power band; otherwise we would either need an engine which created huge torque at 100rpm to move us in slow traffic or one which might rev up to 20,000rpm to move us at speed.

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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Recycle More

Remanufacturing = Sustainability + Efficiency

Apply for Jobs

Mayfair Gearbox's 23 Years In Business

Book A Test Drive