Product Description
The ATS 309-853-4290 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, 2WD drivetrain, and PTO. Designed for extreme-duty applications, this Stage 5 package delivers maximum strength, torque capacity, and reliability for high-horsepower builds, towing, and heavy-use trucks.
This complete package includes an ATS-built Stage 5 Allison LCT1000 transmission, ATS Five Star torque converter, and an ATS deep transmission pan. ATS Stage 5 transmissions are built with upgraded clutch packs, billet internal components, and proprietary modifications to dramatically increase holding capacity and eliminate common Allison weaknesses under high load conditions.
The included Five Star torque converter improves torque multiplication and reduces slippage, while the deep transmission pan increases fluid capacity and cooling efficiency—critical for maintaining performance and extending transmission life in demanding environments.
This package is ideal for performance enthusiasts, work trucks, and towing applications where maximum durability and power handling are required.
FAQ
What is included in the ATS 309-853-4290 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 feature upgraded clutch packs, billet components, and internal modifications designed for high horsepower and extreme-duty use.
Is this transmission suitable for towing?
Yes. This package is built for heavy towing, hauling, and high-performance applications where maximum strength is required.
Does this transmission support PTO?
Yes. This specific model is designed for 2WD trucks equipped with PTO functionality.
Will this fit my truck?
This package fits 2004.5-2005 GM trucks with the 6.6L LLY Duramax engine, Allison transmission, and 2WD configuration.
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)
Equipped with Allison LCT1000 Transmission and PTO
Specifications for ATS 309-853-4290
| Specification | Details |
|---|---|
| Part Number | 309-853-4290 |
| Product Name | ATS Stage 5 Allison LCT1000 Transmission Package |
| Transmission Model | Allison LCT1000 Automatic |
| Engine Fitment | 6.6L LLY Duramax Diesel |
| Vehicle Fitment | 2004.5-2005 GM 2500HD / 3500 |
| Drive Configuration | 2WD |
| PTO Compatibility | Yes |
| 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 |
