Product Description
The ATS 309-814-4272 Stage 1 Allison LCT1000 Transmission Package is a reliable upgrade for 2003–early 2004 6.6L LB7 Duramax trucks equipped with 4WD. Designed as a performance-enhanced stock replacement, this transmission improves durability, shift quality, and overall drivability while maintaining near-OEM characteristics.
This Stage 1 package is ideal for daily drivers, light towing, and mildly modified trucks. It addresses common factory Allison weaknesses while providing increased clutch holding capacity and improved internal components for extended service life.
Built with ATS’s proven engineering, this transmission offers dependable performance for trucks running stock to slightly increased horsepower levels, making it a perfect entry-level upgrade over a factory rebuild.
FAQ
Q: What is the difference between Stage 1 and higher ATS stages?
A: Stage 1 is designed as a reinforced stock replacement, while higher stages include billet components and are built for significantly higher horsepower applications.
Q: Is this transmission good for towing?
A: Yes, it is well-suited for light to moderate towing and daily driving applications.
Q: Does this include a torque converter?
A: Yes, this package includes an upgraded ATS torque converter designed for improved efficiency and durability.
Q: What power levels can this handle?
A: This transmission is designed for stock to mildly upgraded trucks, typically supporting moderate horsepower increases over stock.
Fitment
- 2003 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (4WD)
- 2003 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (4WD)
- Early 2004 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (4WD)
- Early 2004 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (4WD)
Key Features
- Performance-enhanced stock replacement transmission
- Improved clutch holding capacity
- Upgraded internal components for durability
- ATS torque converter included
- Smooth, reliable shift characteristics
- Ideal for daily driving and light towing
- Designed for stock to mildly modified trucks
Specifications for ATS 309-814-4272
| Specification | Details |
|---|---|
| Part Number | 309-814-4272 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LB7 |
| Model Years | 2003 - Early 2004 |
| Horsepower Rating | Stock to Mild Performance |
| Torque Capacity | Improved Over Stock |
| Shipping Weight | Approximately 400 lbs |
| Shipping Method | Freight (Core Charge Applies) |
| Warranty | 5 Year / 500,000 Mile Limited Warranty |
| California Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
