Product Description
The ATS 309-825-4290 Stage 2 Allison LCT1000 Transmission Package is a performance-driven upgrade designed specifically for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD and PTO functionality. Built to address common factory transmission weaknesses, this package delivers improved reliability, increased torque capacity, and enhanced shift performance for both work and daily driving applications.
Perfect for towing, hauling, and mild performance builds, the Stage 2 package incorporates upgraded clutch packs, improved internal components, and recalibrated shift strategies to ensure long-term durability without sacrificing drivability. The included ATS Five Star torque converter enhances power transfer and efficiency, making this an ideal solution for trucks that demand more than stock performance.
This transmission package is engineered to provide dependable performance under load while maintaining smooth operation, making it a top choice for Duramax owners looking to extend transmission life and capability.
FAQ
Q: What is the difference between Stage 2 and higher ATS stages?
A: Stage 2 is designed for stock to mildly modified trucks, offering improved durability and performance without the extreme upgrades found in higher stages.
Q: Is this transmission suitable for towing?
A: Yes, it is ideal for towing and work applications, providing better clutch holding capacity and improved cooling over stock.
Q: Does this include a torque converter?
A: Yes, the package includes an ATS Five Star torque converter for improved torque multiplication and efficiency.
Q: What does PTO compatibility mean?
A: This transmission supports Power Take-Off (PTO) functionality, making it compatible with trucks requiring auxiliary equipment operation.
Fitment
- 2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2004.5 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
Key Features
- Designed for stock to mildly modified trucks
- Improved clutch capacity over factory transmission
- Enhanced shift quality and durability
- ATS Five Star torque converter included
- PTO (Power Take-Off) compatible
- Optimized for towing and daily driving
- Increased reliability under load
- Direct replacement performance transmission package
Specifications for ATS 309-825-4290
| Specification | Details |
|---|---|
| Part Number | 309-825-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 2 |
| Drivetrain | 4WD |
| PTO Compatibility | Yes |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Power Rating | Up to ~500 HP (recommended) |
| 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 |
