PV4-118310
PAGE 1
INTRODUCTION
The GrudgeBox is an all spur 6-speed overdrive transmission that delivers uncompromised
performance in all gears and significantly more torque capacity than the stock unit. The primary
impetus for the design was performance, but the GrudgeBox was also designed for those who
spend a lot of time in the saddle looking for that extra gear on the highway. 6
th
gear is a true
overdrive that is numerically mild to yield a 250 RPM drop as compared to the stock unit. The
gearset fits into the stock transmission case with no modifications. It has earned its BAKER
pedigree with extensive highway testing and many merciless passes at the dragstrip.
FITMENT
• 2006 – Later Dyna
• 2007 – Later Softail & Touring Models
BREAK-IN
The GrudgeBox requires no break-in schedule. However, we do recommend that you take it
easy for the first 20 miles to confirm that there are no issues related to basic function of the
transmission and the reassembly of the motorcycle. You will notice that the transmission will
shift smoother and operate quieter after about 2500 miles. Like any machine, scheduled oil
changes are key to years of trouble-free service. Log your transmission oil changes at the
recommended intervals on page 26. General maintenance can be logged on page 27.
FLUIDS
The GrudgeBox requires 28-32 oz. of transmission fluid. We recommend Spectro 6-speed
transmission oil that has long chain polymers that stand up to the harsh environment that this
high-performance transmission can deliver. Please follow the recommended oil change intervals
on page 26 and document your transmission service history. The exception to the stated
intervals is winter storage. If the bike is stored in an environment that has significant
temperature fluctuations, there will be water condensation inside the transmission. The oil
should be changed immediately when it comes out of storage and is put back into service.
WARRANTY
This product includes a 5-year, 50,000-mile warranty. All steps in these instructions must be
completed as outlined for the warranty to remain valid.
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