Product Description
The ATS 309-845-4290 Stage 4 Allison LCT1000 Transmission Package is a high-performance upgrade designed for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD and PTO functionality. Built to handle aggressive towing and increased horsepower applications, this transmission eliminates common factory weaknesses and replaces them with reinforced, performance-engineered components.
This Stage 4 package is ideal for enthusiasts who demand durability, improved shift quality, and reliable power transfer under heavy loads. Featuring upgraded clutch packs, billet internal components, and the proven ATS Five Star torque converter, this transmission delivers exceptional performance without sacrificing drivability.
Paired with the ATS Co-Pilot controller, this system optimizes shift timing and clutch engagement, ensuring maximum efficiency and longevity. Whether towing heavy loads or running higher horsepower tunes, this transmission is built to perform.
FAQ
Q: What is the difference between Stage 4 and Stage 5 transmissions?
A: Stage 4 is designed for high-performance towing and moderate horsepower builds, while Stage 5 is built for extreme horsepower and competition-level applications with additional billet upgrades.
Q: Does this transmission support PTO functionality?
A: Yes, this package is specifically designed for trucks requiring PTO compatibility.
Q: Is this transmission suitable for towing?
A: Absolutely. This transmission is engineered for heavy towing with improved clutch capacity and cooling efficiency.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved torque multiplication and efficiency.
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 high-performance towing and street use
- Increased clutch capacity over stock
- Billet input shaft and upgraded internal components
- ATS Five Star torque converter included
- Full PTO compatibility
- Deep transmission pan for improved cooling
- ATS Co-Pilot controller for optimized shifting
- Built for durability and extended service life
Specifications for ATS 309-845-4290
| Specification | Details |
|---|---|
| Part Number | 309-845-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 4WD |
| PTO Compatibility | Yes |
| 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 |
