Selby 4 speed dog engagement gear box set.


Selby 4 speed dog engagement gearbox for the classic Mini.

This gearbox has been developed in partnership with 3J Driveline. It has been vigorously tested and enhanced for 2 years to produce what we believe is the best available gearbox for the classic mini. The ratios have been carefully selected and tested in race conditions.

A brief list of features that make this gearbox unique are listed below:

  • Non modular lay gear for ultimate strength and stability
  • Billet selector forks machined from one piece of steel and hardened to finish
  • Proven dog pattern layout
  • Optimised tooth design with standard width for minimum power loss
  • Manufactured from high quality VAR steel
  • Design features that improve the efficiency of the gearbox.

Ratios are





Kits are available super finished if required.

If you would like us to build the kit into a casing please call to discuss

Price £1680.00 + vat

Click here to enquire


“This is one of the contributing factors for our increased podiums. Going from a Jack Knight dog box to this work of art was like chalk and cheese. A joy to shift – effortless gear shifts (you don’t think at first it’s gone in!), no more missed gear changes and best of all power when you need it to pull on those cars in front out of corners (would previously drop back with the JKD). Great quality bit of kit and shows no signs of wear following the abuse it’s been given in around 20 times out on track.” Kieren McDonald