Product Description
The ATS 309-842-4290 Stage 4 Allison LCT1000 Transmission Package is a high-performance upgrade engineered specifically for 2004.5–2005 6.6L LLY Duramax trucks. Designed to eliminate factory transmission weaknesses, this 2WD package delivers significantly improved durability, torque capacity, and shift performance for both towing and performance applications.
Built with upgraded clutch packs, reinforced internal components, and ATS’s precision engineering, this Stage 4 transmission is ideal for trucks running increased horsepower while still maintaining excellent street manners. The included ATS Five Star torque converter enhances torque multiplication and efficiency, while the deep transmission pan improves cooling under load.
This transmission is capable of handling substantially more power than stock, making it the perfect solution for daily drivers, tow rigs, and moderately built performance trucks.
FAQ
Q: What is the difference between Stage 4 and Stage 5?
A: Stage 4 is designed for high-performance street and towing applications, while Stage 5 includes additional billet components for extreme horsepower and competition use.
Q: Is this transmission suitable for towing?
A: Yes, it is built to handle heavy towing with improved clutch capacity and cooling.
Q: Does this include a torque converter?
A: Yes, the ATS Five Star torque converter is included for improved power transfer and efficiency.
Q: What horsepower can this handle?
A: This Stage 4 package is typically rated for up to approximately 750 horsepower depending on setup.
Fitment
- 2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (2WD)
- 2004.5 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (2WD)
- 2005 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (2WD)
- 2005 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (2WD)
Key Features
- Rated up to approximately 750HP
- Increased torque capacity over stock
- Upgraded clutch packs and internal components
- ATS Five Star torque converter included
- Deep transmission pan for improved cooling
- Improved shift quality and durability
- Ideal for towing and performance applications
Specifications for ATS 309-842-4290
| Specification | Details |
|---|---|
| Part Number | 309-842-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Horsepower Rating | Up to 750 HP |
| 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 |
