Product Description
The ATS 303-900-4308 Allison Performance Valve Body is a precision-engineered upgrade designed for 2006-2010 GM trucks equipped with the 6.6L Duramax diesel engine and Allison automatic transmission. Built to improve transmission performance, reliability, and shift consistency, this valve body is an essential upgrade for both stock and modified diesel applications.
ATS enhances the factory valve body by increasing line pressure, optimizing fluid flow, and improving clutch engagement timing. These improvements result in firmer, more consistent shifts while reducing clutch slippage and heat buildup. The upgraded design helps extend transmission life, especially in towing, hauling, and high-performance driving conditions.
Ideal for diesel owners looking to correct common Allison transmission issues or support increased horsepower, the ATS performance valve body delivers improved drivability, durability, and overall transmission control.
FAQ
What does the ATS 303-900-4308 valve body upgrade do?
It improves transmission line pressure, shift quality, and clutch engagement to enhance durability and performance.
What vehicles does this fit?
It fits 2006-2010 GM Silverado and Sierra trucks equipped with the 6.6L Duramax diesel engine and Allison transmission.
Is this a good upgrade for towing?
Yes. This valve body improves holding power and reduces slip, making it ideal for towing and heavy-duty use.
Do I need tuning for this upgrade?
Tuning is not required but can further enhance performance depending on your setup.
Why upgrade the Allison valve body?
The factory valve body can struggle under increased power or load. ATS upgrades improve pressure control and shift performance to prevent premature wear.
FITMENT
2006-2010 Chevy Silverado 2500HD/3500HD 6.6L Duramax Diesel
2006-2010 GMC Sierra 2500HD/3500HD 6.6L Duramax Diesel
Equipped with Allison 1000 Transmission
Specifications for ATS 303-900-4308
| Specification | Details |
|---|---|
| Part Number | 303-900-4308 |
| Product Name | ATS Allison Performance Valve Body |
| Transmission Compatibility | Allison 1000 Automatic |
| Engine Fitment | 6.6L Duramax Diesel |
| Vehicle Fitment | 2006-2010 Chevy/GMC 2500HD & 3500HD |
| Function | Improves Line Pressure, Shift Quality, and Clutch Engagement |
| Performance Benefit | Reduces Slippage and Heat, Increases Transmission Life |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Standard Ground Shipping |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
