Product Description
The ATS 309-814-4290 Stage 1 Allison LCT1000 Transmission Package is a reliable upgrade for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD. Designed as a performance-enhanced replacement over stock, this transmission improves durability, shift quality, and overall drivability while maintaining factory-like operation.
This Stage 1 package is ideal for daily drivers, light towing, and mildly modified trucks looking to eliminate common factory transmission issues. With upgraded clutch packs, improved sealing, and ATS calibration enhancements, this transmission provides increased holding power and longevity without sacrificing smooth shifting.
Built to handle increased torque demands over stock, the ATS Stage 1 transmission is the perfect entry-level performance solution for LLY Duramax owners who want reliability and confidence on the road or while towing.
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 improved reliability and shift quality, while higher stages include billet components for extreme horsepower applications.
Q: Is this transmission good for towing?
A: Yes, it is ideal for daily driving and light to moderate towing, offering improved durability over the factory transmission.
Q: Does this transmission include a torque converter?
A: Yes, it includes an upgraded ATS torque converter designed for improved efficiency and performance.
Q: How much power can this handle?
A: This Stage 1 transmission is designed for stock to mildly upgraded power levels.
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
- Upgraded clutch packs for improved holding capacity
- Enhanced durability over stock transmission
- Smooth, factory-like shift quality
- ATS upgraded torque converter included
- Improved sealing and internal components
- Ideal for daily driving and towing applications
- Direct replacement for factory Allison LCT1000
Specifications for ATS 309-814-4290
| Specification | Details |
|---|---|
| Part Number | 309-814-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Performance Level | Stage 1 (Stock to Mild Builds) |
| 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 |
