Racing Performance
GrudgeBox Builder's Kit
$ 3,695.00
The GrudgeBox is a tough overdrive 6-speed to replace your stock 6-speed! The GrudgeBox was engineered with a focus on excessive torque capacity and crisp shifting. All gears are straight...
OD6: Overdrive 6-Speed Builder's Kit
$ 3,195.00
* Limited supply of chrome bearing doors available. Please give us a call at 517-339-3835 to order a chrome bearing door. This is the ORIGINAL 6-speed design that revolutionized the...