Product Description
The ATS 309-844-4272 Stage 4 Allison LCT1000 Transmission Package is a high-performance upgrade designed for 2003–early 2004 6.6L LB7 Duramax trucks equipped with 4WD. Built to handle increased horsepower and torque over stock, this transmission package delivers improved durability, smoother power transfer, and enhanced reliability for both towing and performance applications.
Engineered with upgraded clutch packs, reinforced internal components, and precision calibration, the Stage 4 package eliminates common factory transmission weaknesses while maintaining excellent drivability. The included ATS Five Star torque converter ensures efficient power delivery, while increased holding capacity makes it ideal for trucks running modified tuning and upgraded fueling systems.
This complete transmission package is perfect for daily-driven trucks, heavy towing setups, and moderate to high horsepower builds looking for a dependable and proven Allison upgrade.
FAQ
Q: What is the difference between Stage 4 and Stage 5?
A: Stage 4 is designed for high-performance street and towing applications, while Stage 5 includes additional billet components for extreme horsepower builds.
Q: Is this transmission good for towing?
A: Yes, the Stage 4 is an excellent option for heavy towing, offering increased clutch capacity and improved heat management.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved torque multiplication and efficiency.
Q: What horsepower can this transmission handle?
A: The Stage 4 transmission is typically rated for up to approximately 700–750 horsepower depending on setup.
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
- Rated up to approximately 750HP
- Significantly increased torque capacity over stock
- Upgraded clutch packs and internal components
- Improved valve body calibration for firmer shifts
- ATS Five Star torque converter included
- Enhanced durability for towing and performance use
- Designed for street, towing, and performance applications
Specifications for ATS 309-844-4272
| Specification | Details |
|---|---|
| Part Number | 309-844-4272 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LB7 |
| Model Years | 2003 - Early 2004 |
| Horsepower Rating | Up to 750 HP |
| Torque Capacity | Significantly increased 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 |
