Product Description
The ATS 309-864-4290 Stage 6 Allison LCT1000 Transmission Package is a top-tier performance upgrade designed for 2004.5-2005 GM Silverado and Sierra trucks equipped with the 6.6L LLY Duramax diesel and 4WD drivetrain. Built to handle extreme horsepower, aggressive tuning, and heavy-duty towing, this Stage 6 package represents one of the most advanced and durable Allison transmission solutions available.
This complete package includes a fully built ATS Stage 6 Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan. ATS enhances the Allison platform with billet internal components, upgraded clutch packs, and proprietary modifications to significantly increase torque capacity and eliminate common factory failures.
Designed for high-performance diesel applications, this transmission is ideal for trucks running larger injectors, upgraded turbos, or aggressive tuning. It delivers firm, consistent shifts, improved power transfer, and maximum durability under extreme conditions.
FAQ
What is included in the ATS 309-864-4290 package?
This package includes a Stage 6 built Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan.
What makes the Stage 6 transmission different?
Stage 6 transmissions include upgraded billet internals, increased clutch capacity, and modifications designed for high-horsepower and extreme-use applications.
Is this transmission suitable for high horsepower builds?
Yes. This package is specifically designed for high-performance trucks with significant power upgrades.
Is this good for towing?
Absolutely. It is built to handle extreme towing loads while maintaining reliability and cooling efficiency.
Will this fit my truck?
This transmission fits 2004.5-2005 GM Silverado and Sierra 2500HD/3500 trucks equipped with the 6.6L LLY Duramax and Allison transmission (4WD).
FITMENT
2004.5-2005 Chevy Silverado 2500HD 6.6L LLY Duramax Diesel (4WD)
2004.5-2005 Chevy Silverado 3500 6.6L LLY Duramax Diesel (4WD)
2004.5-2005 GMC Sierra 2500HD 6.6L LLY Duramax Diesel (4WD)
2004.5-2005 GMC Sierra 3500 6.6L LLY Duramax Diesel (4WD)
Specifications for ATS 309-864-4290
| Specification | Details |
|---|---|
| Part Number | 309-864-4290 |
| Product Name | ATS Stage 6 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 | 4WD |
| Included Components | Stage 6 Built Transmission, Five Star Torque Converter, Deep Transmission Pan |
| Performance Level | Stage 6 (Extreme Duty / High Horsepower) |
| Material | Billet Internal Components & Upgraded Clutch Packs |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Freight Shipping Required |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
