Product Description
The ATS 303-900-4272 Allison Performance Valve Body is a precision-engineered upgrade designed for 2003-2005 GM trucks equipped with the 6.6L Duramax diesel and Allison 1000 transmission. Built to improve hydraulic control, increase line pressure, and deliver firmer, more consistent shifts, this valve body upgrade enhances both performance and transmission longevity.
ATS modifies the factory valve body to correct common pressure and shift inconsistencies found in stock Allison transmissions. By optimizing fluid flow and clutch apply rates, this performance valve body reduces slip, improves shift timing, and increases holding capacity under load.
Ideal for towing, hauling, and performance applications, this upgrade is essential for trucks with added horsepower or those looking to prevent premature transmission wear. Whether your truck is stock or modified, the ATS valve body ensures reliable operation and improved drivability.
FAQ
What does the ATS 303-900-4272 valve body improve?
It improves line pressure, shift firmness, clutch engagement, and overall transmission performance.
Is this a good upgrade for towing?
Yes. This valve body is designed to improve durability and reduce slip under heavy loads, making it ideal for towing and hauling.
Will this work on a stock truck?
Yes. It works on both stock and modified trucks and is commonly used to improve reliability.
Do I need tuning with this valve body?
Tuning is not required but can further enhance performance depending on your setup.
Why upgrade the Allison valve body?
The factory valve body can suffer from pressure inconsistencies and slip. ATS upgrades correct these issues and improve transmission lifespan.
FITMENT
2003-2005 Chevrolet Silverado 2500HD 6.6L Duramax Diesel
2003-2005 Chevrolet Silverado 3500 6.6L Duramax Diesel
2003-2005 GMC Sierra 2500HD 6.6L Duramax Diesel
2003-2005 GMC Sierra 3500 6.6L Duramax Diesel
Equipped with Allison 1000 Transmission
Specifications for ATS 303-900-4272
| Specification | Details |
|---|---|
| Part Number | 303-900-4272 |
| Product Name | ATS Allison Performance Valve Body |
| Transmission Compatibility | Allison 1000 |
| Engine Fitment | 6.6L Duramax Diesel |
| Vehicle Fitment | 2003-2005 GM 2500HD / 3500 |
| Function | Improves Line Pressure, Shift Quality, and Clutch Engagement |
| Performance Benefit | Reduced Slip, Increased Holding Capacity, Improved Durability |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Standard Ground Shipping |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
