Product Description
The ATS 309-834-4272 Stage 3 Allison LCT1000 Transmission Package is a high-performance upgrade designed for 2003–early 2004 6.6L LB7 Duramax trucks equipped with 4WD. Built to significantly improve durability and performance over the factory Allison transmission, this package is ideal for towing, daily driving, and moderate horsepower builds.
Engineered with upgraded clutch packs, reinforced internal components, and precision tuning, the Stage 3 transmission delivers increased torque capacity, smoother shifts, and long-term reliability. The included ATS Five Star torque converter enhances power transfer and efficiency, making this a well-balanced upgrade for both work and performance applications.
This complete transmission package is designed to handle increased power levels while maintaining excellent drivability, making it a perfect solution for trucks that demand more than stock without stepping into extreme race-level builds.
FAQ
Q: What is the difference between Stage 3 and Stage 5 transmissions?
A: Stage 3 is designed for moderate performance and towing, while Stage 5 includes billet shafts and is built for extreme horsepower applications.
Q: Is this transmission good for towing?
A: Yes, the Stage 3 package is an excellent choice for heavy towing and daily driving with improved reliability over stock.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved torque multiplication and efficiency.
Q: How much power can this transmission handle?
A: The Stage 3 transmission is typically suited for builds up to approximately 600–700 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
- Designed for towing and moderate performance builds
- Increased torque capacity over stock
- Upgraded clutch packs and internal components
- ATS Five Star torque converter included
- Improved shift quality and transmission longevity
- Built for 4WD applications
- Excellent balance of performance and reliability
Specifications for ATS 309-834-4272
| Specification | Details |
|---|---|
| Part Number | 309-834-4272 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 3 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LB7 |
| Model Years | 2003 - Early 2004 |
| Horsepower Rating | Up to 650 HP (estimated) |
| Torque Capacity | Upgraded 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 |
