Shift Kit

Features:

• Fits 2001-2005 GM 6.6L Duramax LB7 and LLY
• Designed for Silverado and Sierra HD models
• Corrects common Allison transmission shifting issues
• Prevents slipping from 3rd to 4th gear
• Reduces clutch burning under heavy load
• Improves upshift and downshift performance
• Provides smooth, crisp gear transitions
• Ideal for towing, racing, and daily driving
• Includes detailed installation instructions
• Transmission removal required for installation

Eliminate Shifting Problems and Unlock True Transmission Performance

If you’ve owned a 2001-2005 Duramax for any length of time, you’ve probably heard about or even experienced the frustrating issues that can pop up with the Allison 1000 series transmission. From slipping between third and fourth gear to dropping into neutral under load or sticking in one gear entirely, these problems can leave you second-guessing your truck when you need it most. The SunCoast Shift Kit is designed to correct these exact issues by improving clutch control and shift timing inside the valve body. Whether you use your truck for towing, work, or even competitive racing, this kit delivers short, crisp, and reliable shifts that give you back the confidence you need behind the wheel.

Built for Towing, Racing, and Everyday Duramax Owners

This complete valve body shift kit not only helps prevent clutch damage and gear slippage but also makes your Allison transmission feel tighter and more responsive in every gear. It’s engineered for heavy-duty applications like towing and performance driving, yet it’s just as beneficial for anyone who wants their truck to feel smoother and more predictable on the street. The kit comes with detailed instructions to guide you through the install, but it’s important to know that transmission removal is required to get the job done right. If you’re looking for a proven solution to one of the most common weak points in your early model Duramax drivetrain, the SunCoast Shift Kit is a solid investment that pays off with every shift.

Fits: 2001, 2002, 2003, 2004, 2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7/LLY