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Technical / Sale Enquiry Form

Please complete the form below:

Name:
Tel/Cell:
Email:
City:
Make:
Model:
Engine Type:
Transmission Type:
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?

8 - 3 =


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The Planetary Gearset: Automatic Transmissions

When you take apart and look inside an automatic transmission, you find a huge assortment of parts in a fairly small space. Among other things, you see:

  • A set of three wet-plate clutches to lock other parts of the gear-set
  • An clever planetary gear-set
  • A large gear pump to move transmission fluid around
  • A set of bands to lock parts of a gear-set
  • An extremely odd hydraulic system that controls the bands and clutches

The center of attention is the planetary gear-set. About the size of a cantaloupe, this one part makes all of the different gear ratios that the transmission can create. Everything else in the transmission is there to help the planetary gear set do its thing. You may recognise it from the electric screwdriver article. An automatic transmission comprises two complete planetary gear sets folded together into one component. Any planetary gear-set has three main components:

  • The sun gear
  • The planet gears and the planet gears' carrier
  • The ring gear

One of the planetary gear sets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. We can get lots of different gear ratios out of this gear set.
Also, locking any two of the three components together will lock up the whole device at a 1:1 gear reduction. Notice that the first gear ratio listed above is a reduction; the output speed is slower than the input speed. The second is an overdrive; the output speed is faster than the input speed. The last is a reduction again, but the output direction is inverted. There are several other ratios that can be acquired out of this planetary gear set, but these are the ones that are applicable to our automatic transmission.

So this one set of gears can create all of these diverse gear ratios without having to engage or disengage any other gears. With two of these gear sets in a row, we can get the four forward gears and one reverse gear our transmission needs. They will put the two sets of gears together in the next section.

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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