4° Back Cut Shift Dogs More hook for the hold! The 4° back cutangleon all GrudgeBox shift dogs ensures positive gear engagement and eliminates hop out.
Shift System Shift with certainty! The GrudgeBox features our frictionless linear detent shift system. The shift drum utilizes a fixed spindle design for smooth, low inertia, indexing. It’s easy to find neutral with our redundant neutral detent, which is incorporated into the architecture of the shift system.
A) Smooth linear 11/32” detent ball bearing riding on 60 micro ball bearings
B) Linear motion is controlled by a caged 24 microballbearing assembly
C) 44lb/in compression spring
New Pawl Design Shift with ease! Conventional shifter pawls have a 2-point pivot system. Our new low effort single axis/linear motion shifter pawl rotates from one central pivot point, allowing continuous motion throughout the shift. Overshift inhibitors prevent any missed shifts.
Speedometer Reluctor Ring Stay calibrated! The GrudgeBox utilizes a speedometerreluctorring for sending the vehicle speed signal through the stock speed sensor, keeping the pulses per mile the same as stock. Your speedometer will indicate the correct speed without the use of a recalibration box. PCM reflash is required for correct gear indication and proper cruise control operation.
Bigger Gears Stronger! The GrudgeBox gears are up to 40% wider than stock for superior strength and durability.
Pie Shaped Shift Dogs Positive shift engagement! Intended for high horsepower applications and well suited for everyday cruising, thepie shapedshift dogs used in the GrudgeBox provide significantly moredog tooth/pocket landing area for positive dog tooth engagement while in gear.
Main Drive Gear Bearing Bulletproof! The GrudgeBox comes with our exclusive double tapered roller bearing assembly(patent pending) to eliminate the all too common stock main drive gear bearing failures.
Simpler Pawl Design Built for a beating! Conventional shifter pawls have a 2-point pivot system. Our new single axis/linear motion shifter pawl has fewer points of motion and will hold up under high horsepower and aggressive shifting.
New Generation OVERDRIVE Cruise at 80 mph with the overdrive 6th gear, lowering RPM on the highway for improved fuel economy, reduced vibration and less wear and tear on the rider.
.92 overdrive in 6th gear provides a 250 rpm reduction while cruising at 80 mph.
GrudgeBox, 3.20 1st gear ratio
2006-Later Dyna, 2007-Later Softail/Touring
GrudgeBox, 3.20 1st gear ratio
2017 Milwaukee 8 models
Engineered and manufactured in the USA with a focus on excessive torque capacity and crisp shifting. Included is our 5-year/50,000 mile limited warranty forworry free, aggressive riding.
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We're hell-bent on not holding back with what we do. What do we do? As the Drivetrain Authority, we do what a drivetrain does on a US V-Twin: We're talking big power and delivering it to the ground. We're wielding American power to the pavement for all.