Allison Performance Valve Body

Features:

• Fits 2003–2005 GM 2500HD and 3500HD
• Designed for 6.6L Duramax engines
• Compatible with LCT1000 5-speed transmission
• Boosts shift performance and reliability
• Ideal for towing and heavy-duty use
• Improves line pressure and clutch engagement
• Built for diesel-powered GM trucks
• Enhances durability under high power loads
• Includes full performance valve body kit

Built for the Demands of Towing and Performance

If you're running a 2003 to 2005 GM 2500HD or 3500HD with a 6.6L Duramax and the LCT1000 5-speed Allison transmission, the ATS Performance Valve Body is the upgrade your transmission needs to keep up with serious workloads. Whether you're hauling heavy loads, towing long distances, or pushing your truck harder than stock, this performance valve body brings the precision and durability that stock setups often lack. Designed to enhance shift quality and responsiveness, it boosts line pressure and ensures clutch packs engage more cleanly and firmly. That means fewer delays between gears and a noticeable improvement in how your truck handles power under load.

Dependable Shifts When It Matters Most

ATS engineers this valve body with performance and longevity in mind, using their years of diesel tuning experience to build a unit that’s strong enough for heavy use but refined enough for daily driving. It’s a great fit for truck owners who demand more from their transmission but don’t want to sacrifice smooth operation. Installation is straightforward with the included kit, making this an ideal weekend upgrade for those looking to increase reliability without diving into a full transmission build. Backed by ATS's reputation in the diesel world, this valve body helps your Allison deliver consistent, firm shifts in any condition, giving you confidence every time you put your foot down.

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