Find the Shift Enhancements products you need to improve the shifting of the transmission in your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax. Top brands such as TransGo, BD-Power and XDP are available for most modern diesel transmission applications. These Shift Enhancements increase line pressure to make your vehicle shift firmer and quicker. By reducing the duration of slip from one gear to the next, a faster shift can help to extend transmission life and enhance torque converter clutch life. With XDP's Shift Enhancements products, you can improve the shifting of your vehicle's transmission!