About Us

Started by John Gilmore over 35 years ago, he and his team are still going strong specializing in diff repairs and servicing.

The difference about The Diff Shop is that they establish a standard of workmanship to be proud of, and stand behind all of our attributes.

Many hours of research and development has been tried on all different makes and models of cars and after-make parts, they make sure that the best possible job is developed.

Over the years many big jobs have been done from Rally cars, Race cars, Drag cars, Street cars, 4WDs, Restoration, Ratio changes etc, such as the PDL mustang 2 and many more. They are proud of their work and wish to stay that way.


Stephen Wright - Director - 10 years service experience at The Diff Shop operating as a senior drive-train technician.

George Bull -  Drive-train technician - 5 Years experience at the The Diff Shop .

About the Differential

The diffential has three jobs: 

  1. To aim the engine power at the wheels

  2. To act as the final gear reduction in the vehicle, slowing the rotational speed of the transmission one final time before it hits the wheels

  3. To transmit the power to the wheels while allowing them to rotate at different speeds (this is the one that earned the differential its name.)

Why you need a differential

Car wheels spin at different speeds, especially when turning. Since speed is equal to the distance traveled divided by the time it takes to go that distance, the wheels that travel a shorter distance travel at a lower speed. For the non-driven wheels on your car — the front wheels on a rear-wheel drive car, the back wheels on a front-wheel drive car — this is not an issue. There is no connection between them, so they spin independently. But the driven wheels are linked together so that a single engine and transmission can turn both wheels. If your car did not have a differential, the wheels would have to be locked together, forced to spin at the same speed. This would make turning difficult and hard on your car: For the car to be able to turn, one tire would have to slip. With modern tires and concrete roads, a great deal of force is required to make a tire slip. That force would have to be transmitted through the axle from one wheel to another, putting a heavy strain on the axle components.