This Fleece Performance FPE - TAPSHIFTER35 TapShifter is a game - changer for 2003 - 2005 GM vehicles with 6.6L Duramax and Allison Transmissions. Just like newer trucks, you can shift your transmission with a simple button touch. It's ideal for towing, drag racing, and daily driving. The TapShifter installs quickly and offers factory - like operation, functionality, and style. It can also be used in 2001 - 2005 gas or diesel pickups or 5 - Speed Kodiak/TopKick trucks with an Allison Transmission. Features include easy plug - and - play installation, limiting up - shifts, overdrive disable, command downshifts, and reducing gear hunting. Operating it is a breeze: press the '-' button to downshift and the '+' button to upshift. Installation takes less than 30 minutes using OEM high - quality connectors. Check our Resources Page for installation instructions.

Using the TapShifter is easy. To shift down, just press the '-' button on the shifter. To shift up, press the '+' button. It allows you to select a range with the shift lever and then tap up and down without going to a higher range than selected. When installing, make sure to use the provided OEM high - quality connectors. The whole installation process should take less than 30 minutes. For detailed installation steps, visit our Resources Page. There aren't many special maintenance requirements. Just keep it clean and check the connections periodically to ensure it works properly. Also, it's designed for specific vehicle models (2001 - 2005 pickups or 5 - Speed Kodiak/TopKick trucks with an Allison Transmission, and 2003 - 2005 GM with 6.6L Duramax and Allison Transmissions), so don't try to use it on other vehicles without checking compatibility first.