GrudgeBox Builder's Kit Configuration:2018-Up M8 Softail, Polished Door, N1 Shift Pattern N1 Shift Pattern DD6-81102 DD6

N1 Shift Pattern DD6-81102 DD6 Transmission Assembly

All DD5 bearing doors have the same outer profile as a stock 5-speed

Less shift clunk - Each design improvement combines in a precise mechanical choreography that is inherently silent

Center Rod

5 Hog Black Pan

GrudgeBox Builder's Kit Configuration:2018-Up M8 Softail, Polished Door, N1 Shift Pattern N1 Shift Pattern DD6-81102 DD6The 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 cut in a way that ensures maximum power transfer to the rear wheel. This gearset was designed and geared for the everyday highway riders, speed freaks, and even racers! Features Built to take high horsepower abuse found in late model H D performance applications