Part # 303-900-4272

ATS ALLISON PERFORMANCE VALVE BODY FITS 2003-2005 6.6L DURAMAX 303-900-4272

$857.68

The ATS Performance Valve Body Assembly for the 2003-2005 GM 6.6L Duramax with Allison LCT1000 transmission improves shift quality, reduces transmission slip, and enhances overall transmission performance. Ideal for both high-performance and heavy-duty applications.


  • Designed for 2003-2005 GM 6.6L Duramax with Allison LCT1000 transmission
  • Improves shift quality and reduces transmission slip
  • Optimized for high-performance and towing applications
  • Increases transmission response and durability
  • Direct replacement for the stock valve body
  • Complete installation kit included

The ATS Performance Valve Body Assembly is engineered to enhance the performance of the Allison LCT1000 transmission in 2003-2005 GM 6.6L Duramax trucks. The stock valve body can struggle with the increased demands of high-performance or heavy-duty towing, resulting in transmission slip and inconsistent shifts. The ATS Performance Valve Body addresses these issues by improving shift quality, reducing slip, and providing increased durability.

This valve body assembly is designed to optimize hydraulic pressure and clutch engagement, ensuring smoother and quicker shifts, even under extreme conditions. The improved shift timing and higher pressure make this valve body a key upgrade for those pushing their truck’s transmission beyond factory limits. Whether you're towing heavy loads or upgrading for performance, this valve body helps ensure reliability and better transmission response.

The kit comes as a direct replacement for the factory valve body and includes everything necessary for a complete installation, making it a straightforward upgrade that will extend the life and performance of your transmission.

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