ATS 303-904-4308 Allison Trim Valve Kit | 2006-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Fits 2006–2010 Silverado and Sierra HD
• Designed for 6.6L Duramax engines
• Compatible with Allison LCT1000 6-speed
• Improves transmission shift performance
• Helps optimize line pressure control
• Ideal for towing and performance builds
• Durable components built for diesel use
• Supports smoother and more reliable shifts
• Sold as a complete installation kit
• Manufactured by ATS Diesel Performance

Shift Smarter with an Upgrade That Matters

If you're driving a 2006–2010 Silverado or Sierra HD with a 6.6L Duramax and the Allison LCT1000 6-speed transmission, you know that smooth, consistent shifts make all the difference—especially under load. The ATS Trim Valve Kit is a targeted upgrade designed to improve shift quality and line pressure control. Whether you’re towing, daily driving, or laying into the throttle with a performance tune, this kit helps your transmission respond faster and more precisely. It replaces factory trim valves that can wear or stick over time, reducing hesitation and giving your truck the crisp shifting feel it should have had from the start.

Reliable Performance Backed by Proven Engineering

Built by ATS Diesel Performance, a trusted name in diesel innovation for nearly two decades, this kit is part of a lineup designed for real-world use. The components are manufactured to tight tolerances and built specifically to handle the pressure and demands of diesel applications. Installation is straightforward, and the result is a noticeable improvement in drivability—especially under hard acceleration or heavy towing conditions. It’s a practical, affordable way to protect your transmission investment while dialing in better shift control. Whether you're just getting into upgrades or already deep into a performance build, this trim valve kit is a smart addition that delivers real results without breaking the bank.

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