Product Description
The ATS 309-844-4290 Stage 4 Allison LCT1000 Transmission Package is a premium performance upgrade for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD. Built to handle substantially increased horsepower and torque, this transmission package is engineered to eliminate factory weaknesses while delivering reliable, consistent performance under heavy load and high-power conditions.
Designed for enthusiasts who demand strength and dependability, the Stage 4 package features upgraded clutch capacity, reinforced internal components, and precision calibration. Paired with the ATS Five Star torque converter and Co-Pilot transmission controller, this setup delivers improved shift quality, increased torque holding capability, and superior drivability whether towing or running aggressive tuning.
This complete transmission solution is ideal for trucks producing significantly more than stock power levels, offering exceptional durability and performance without sacrificing everyday usability.
FAQ
Q: What is the difference between Stage 4 and Stage 5 transmissions?
A: Stage 4 transmissions are designed for high-performance street and towing applications, while Stage 5 units include additional billet internals for extreme horsepower and competition use.
Q: Is this transmission suitable for towing heavy loads?
A: Yes, the Stage 4 package is built specifically to improve towing reliability with increased torque capacity and better thermal control.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for optimal power transfer and efficiency.
Q: Do I need a transmission controller?
A: This package includes the ATS Co-Pilot controller, which enhances shift timing, firmness, and clutch protection.
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 high-performance street and towing applications
- Increased clutch capacity and upgraded internals
- ATS Five Star torque converter included
- Improved shift quality and durability
- Deep transmission pan for enhanced cooling
- ATS Co-Pilot controller for optimized shifting
- Built for increased horsepower and torque applications
Specifications for ATS 309-844-4290
| Specification | Details |
|---|---|
| Part Number | 309-844-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 4WD |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Horsepower Rating | Up to 750 HP (Estimated) |
| 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 |
