SunCoast A1-VB-06 Allison Valve Body | 2006-2010 GM 2500HD/3500HD 6.6L Duramax

Features:

• Improves shift timing and quality
• Enhances torque converter performance
• Increases internal lubrication flow
• Maintains lube flow in park
• Supports converter lockup in all gears
• Delivers firmer, crisper shifts
• Reduces operating transmission temperatures
• Pre-tested and certified before shipping
• Compatible with aftermarket controllers
• Designed for heavy-duty applications
• Helps extend transmission service life
• Direct fit for Allison-equipped Duramax trucks

Allison Valve Body for LBZ/LMM Duramax

If you're serious about getting the most out of your Allison transmission, the SunCoast Valve Body is one of those upgrades that makes a real difference—especially if you're pushing your Duramax hard or using your truck for heavy towing. Designed for 2006–2010 GM 2500HD and 3500HD trucks with the 6.6L Duramax, this upgraded valve body fine-tunes transmission behavior across the board, from how it shifts to how it handles heat and lubrication. At the core, the valve body controls things like gear selection, line pressure, converter flow, and shift timing. The stock setup does an okay job for everyday driving, but once you start adding power or load, weaknesses start to show. That’s where the SunCoast unit shines. It sharpens up shift quality, improves torque converter performance, and ensures reliable lube flow—even when you're in park or under heavy throttle. It's also calibrated to allow torque converter lockup in all forward gears when used with a compatible controller, which is a huge benefit if you're running an exhaust brake or just want more control.

Straightforward Install

Installation is straightforward for a seasoned wrench, and each unit is tested and certified before it leaves the shop. This isn’t just a parts-bin refresh—it’s a purpose-built component engineered to increase transmission durability and responsiveness under real-world, high-demand conditions. Whether you're hauling trailers, racing at the strip, or daily driving a tuned Duramax, this valve body adds confidence and control every time you shift.

Fits: 2006, 2007, 2008, 2009, 2010 GM 6.6L Duramax