Shift Kit

Features:

• Fits 2006-2010 GM 6.6L Duramax models
• Designed for Silverado and Sierra HD trucks
• Fixes common Allison transmission shift problems
• Prevents slipping between third and fourth gear
• Reduces C2 and C3 clutch burning
• Stops sticking in gear under load
• Delivers smooth and crisp gear changes
• Ideal for towing, racing, or daily use
• Improves shift timing and clutch control
• Includes complete installation instructions
• Professional installation recommended

Smoother, More Reliable Shifts for Your Duramax

If your 2006-2010 Duramax feels like it’s slipping between gears or holding onto one longer than it should, chances are your Allison transmission could use a little help. The SunCoast ALLISONSK-JR Shift Kit is built specifically for these trucks to correct those common transmission headaches. Whether you use your Silverado or Sierra HD for towing heavy loads, hauling gear to the job site, or just want a smoother daily drive, this kit helps eliminate problems like 3rd to 4th gear slip, clutch burning, and sticking in gear. It’s designed to improve clutch control and shift quality, giving you clean, consistent upshifts and downshifts, even under heavy load or high-stress conditions.

A Smart Upgrade for Work or Play

This kit doesn’t just patch problems; it actually makes your transmission feel tighter and more responsive. You’ll notice quicker shift timing and a more connected feel every time you get behind the wheel. From weekend towing trips to all-out performance builds, this shift kit holds up to the kind of punishment Duramax owners expect their trucks to handle. It comes with detailed installation instructions, making it easier for experienced installers or professional shops to get the job done right. If you’re looking for a smart, proven way to improve your Allison’s reliability and performance, the SunCoast ALLISONSK-JR Shift Kit is a solid investment for any 2006-2010 Duramax owner.

Fits: 2006, 2007, 2008, 2009, 2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax