Add fingertip control to your 2001-2005 Duramax Allison 1000 transmission for easy Tap Shifting when passing, pulling, hill climbing or whenever you need to switch gears quickly – just like the newer trucks. Tap Shifter Kits includes new gear shift lever that pre-bent for a better fit, a control module and a harness with factory plug-in connections makes for a clean and easy install. The 2001-2002 kit also includes an amber LED light for OD disable indication.