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With an innovative architecture based on the concepts used in F1, SADEV offers a gearbox of only 37.5 kg combining technicality, audacity and cost control.

In order to grant a better weight distribution, our design department has chosen to place the differential at the rear.

The other main feature of the SLR75-14? It has a structural casing. All the suspension and rear ends are fixed to the casing. F4 homologated by the FIA, the SLR75-14 gearbox has already convinced many chassis manufacturer.


  • 6 speed sequential gearbox + 1 reverse gear
  • Manual sequential gear selection (external semi-auto optional)
  • External selector rocker (optional)
  • Bevel gear ratio: 10×31 or 8×31
  • The bevel gear is cut and grinded in house on our CNC units
  • Wide range of ratios available
  • Straight cut gears
  • Gear engagement made by dogs
  • Interchangeable gear ratios
  • High strength carburizing steel
  • Gear teeth grinded with optimized profile
  • Shot penning on internal parts
  • Specific input shaft
  • Free differential (limited slip differential optional)
  • Ramp and plate system – 3 discs type
  • Preload made by belleville washer
  • Wide range of ramp plates available
  • Reverse lockout cable (solenoid system optional)
  • Contactless gear position sensor
  • Splash lubrication system
  • Oil pump integrated (optional)
  • AS7G aluminum casing
  • Weight (input shaft included) : 37.5 Kg – 81 lbs
  • Engine torque max 400Nm