Product Description
The ATS 309-812-4272 Stage 1 Allison LCT1000 Transmission Package is the ideal upgrade for 2003–early 2004 6.6L LB7 Duramax trucks needing improved reliability and performance over the factory transmission. Designed as a heavy-duty replacement, this package strengthens known weak points while maintaining excellent drivability for daily use and towing.
Built with upgraded clutch packs, improved sealing rings, and enhanced internal components, the Stage 1 transmission provides increased torque capacity and durability without sacrificing smooth shifting characteristics. Paired with the ATS Five Star torque converter, this package delivers better power transfer and efficiency under load.
This is the perfect solution for stock to mildly modified trucks looking for long-term reliability, improved towing performance, and increased transmission lifespan.
FAQ
Q: What is the difference between Stage 1 and higher ATS stages?
A: Stage 1 is designed for stock to mildly modified trucks, focusing on reliability and improved clutch capacity, while higher stages include billet components for extreme horsepower applications.
Q: Is this transmission good for towing?
A: Yes, it is an excellent upgrade for towing, offering better heat resistance and torque handling than the factory transmission.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved performance and efficiency.
Q: What horsepower level is this rated for?
A: Stage 1 is designed for stock to moderately increased horsepower levels, making it ideal for daily drivers and light performance builds.
Fitment
- 2003 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- 2003 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- Early 2004 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- Early 2004 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
Key Features
- Improved clutch capacity over stock
- Enhanced durability for towing and daily driving
- Upgraded internal components and sealing rings
- ATS Five Star torque converter included
- Smooth, factory-like shift quality
- Designed for stock to mildly modified trucks
- Increased transmission lifespan and reliability
Specifications for ATS 309-812-4272
| Specification | Details |
|---|---|
| Part Number | 309-812-4272 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 2WD |
| 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 |
