These kits have been designed to fit the standard gear cases of most popular competition cars. Available with dog type engagement or synchromesh.
Some kits replace four, with five gears or five with six gears.
Gear Kits for competition use are available for a wide range of vehicles. Porsche 911 G50 - uprated helical Ford Escort Mondeo MTX and earlier. These are available for a wide variety of GM gearboxes, some adding a gear to form a six speed cluster. The F25 kits are also suitable for some Saab gearboxes.