Product Description
The ATS 309-852-4290 Stage 5 Allison LCT1000 Transmission Package is a top-tier performance upgrade engineered for 2004.5-2005 GM Silverado and Sierra trucks equipped with the 6.6L LLY Duramax diesel engine and 2WD drivetrain. Designed for extreme towing, high-horsepower builds, and heavy-duty use, this Stage 5 package delivers maximum durability, torque capacity, and transmission reliability.
This complete ATS package includes a fully built Stage 5 Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan. ATS enhances the Allison platform with upgraded clutch packs, billet internal components, and precision calibration to handle significantly increased power levels while maintaining smooth and consistent shifting.
The included Five Star torque converter improves torque multiplication and lock-up efficiency, while the deep transmission pan increases fluid capacity and cooling performance. This combination ensures reduced heat, improved lubrication, and longer transmission life under demanding conditions.
Built for serious diesel performance enthusiasts and work truck owners, the ATS Stage 5 package is ideal for trucks running higher horsepower, heavy towing loads, or operating in extreme environments where stock transmissions fail.
FAQ
What is included in the ATS 309-852-4290 package?
This package includes a Stage 5 built Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan.
What makes the Stage 5 transmission different?
Stage 5 transmissions are built with upgraded clutch packs, billet internals, and higher torque capacity for extreme performance and heavy-duty applications.
Is this transmission good for towing and high horsepower?
Yes. This package is specifically designed for heavy towing, racing, and high-horsepower diesel applications.
Will this fit my truck?
This transmission fits 2004.5-2005 GM trucks equipped with the 6.6L LLY Duramax diesel and 2WD configuration.
Why upgrade to an ATS Stage 5 Allison transmission?
ATS upgrades eliminate common Allison weaknesses, improve torque capacity, and provide long-term reliability under extreme stress.
FITMENT
2004.5-2005 Chevrolet Silverado 2500HD 6.6L LLY Duramax Diesel (2WD)
2004.5-2005 Chevrolet Silverado 3500 6.6L LLY Duramax Diesel (2WD)
2004.5-2005 GMC Sierra 2500HD 6.6L LLY Duramax Diesel (2WD)
2004.5-2005 GMC Sierra 3500 6.6L LLY Duramax Diesel (2WD)
Specifications for ATS 309-852-4290
| Specification | Details |
|---|---|
| Part Number | 309-852-4290 |
| Product Name | ATS Stage 5 Allison LCT1000 Transmission Package |
| Transmission Model | Allison LCT1000 |
| Engine Fitment | 6.6L LLY Duramax Diesel |
| Vehicle Fitment | 2004.5-2005 GM Silverado/Sierra 2500HD/3500 |
| Drive Configuration | 2WD |
| Included Components | Stage 5 Built Transmission, Five Star Torque Converter, Deep Transmission Pan |
| Performance Level | Stage 5 (Extreme Duty / High Horsepower) |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Freight Shipping Required |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
