The Fleece Performance TapShifter allows you to shift your 2001-2005 GM Allison Transmission with the touch of a button, just like the 2006 and newer trucks. Perfect for towing, drag racing, daily driving and everything in between, the TapShifter installs in no time and provides factory-like operation, functionality and styling. The TapShifter retails for $324.99 and can be used in diesel GM trucks with an Allison transmission from 2001-2005, although 2001-02 models will require TCM Re-Flash to enable overdrive lock-out and proper function. (855-839-5040/www.fleeceperformance.com)