Product Description
The ATS 309-834-4290 Stage 3 Allison LCT1000 Transmission Package is a high-performance upgrade designed specifically for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD. Built to significantly outperform the factory Allison transmission, this package delivers improved strength, reliability, and towing performance while maintaining excellent drivability.
Engineered for daily driving, towing, and moderate performance builds, the Stage 3 transmission features upgraded clutch packs, improved internal components, and ATS’s proven Five Star torque converter. This combination provides smoother engagement, increased holding power, and reduced slippage under load.
Whether you're towing heavy loads or running increased power levels, this transmission package ensures dependable performance with enhanced durability over stock.
FAQ
Q: What is the difference between Stage 3 and higher stages?
A: Stage 3 is ideal for towing and moderate performance builds, while higher stages include more billet components for extreme horsepower applications.
Q: Is this transmission suitable for towing?
A: Yes, it is specifically designed to improve towing performance with increased clutch capacity and better heat management.
Q: Does this include a torque converter?
A: Yes, the package includes the ATS Five Star torque converter for improved efficiency and torque transfer.
Q: What horsepower can this transmission handle?
A: This Stage 3 transmission is ideal for trucks in the 500–650HP range depending on setup.
Fitment
- 2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2004.5 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
Key Features
- Designed for 500–650HP applications
- Increased clutch capacity over stock
- Upgraded internal components for durability
- ATS Five Star torque converter included
- Improved shift quality and reduced slippage
- Enhanced towing performance and reliability
- Built for daily driving, towing, and performance use
Specifications for ATS 309-834-4290
| Specification | Details |
|---|---|
| Part Number | 309-834-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 3 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Horsepower Rating | 500 - 650 HP |
| Torque Capacity | 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 |
