Blessed Performance has the Fleece Tap shifter GM/Allison Kodiak/TopKick Duramax trucks.
TapShifter Operation is very straight forward. To downshift depress the "-" button on the shifter. To upshift press the "+" button. The TapShifter will allow you to select a range with the shift lever and then tap up and down without worry of tapping to a higher range than selected. This feature is great for sled pullers who do not want to shift to 4th gear on the track!
Highlights:
• Easy Plug & Play Installation
• Limits Up-Shifts
• Overdrive Disable
• Command Downshifts
• Decrease Gear Hunting