Product Description
The ATS 309-865-4272 Stage 6 Allison LCT1000 Transmission Package is the ultimate high-performance transmission solution for 2003–early 2004 GM trucks equipped with the 6.6L LB7 Duramax diesel engine. Designed for extreme horsepower, heavy towing, and demanding work conditions, this package delivers unmatched strength, durability, and performance over stock Allison transmissions.
This complete ATS package includes a fully built Stage 6 Allison LCT1000 transmission, ATS Five Star torque converter, and supporting internal upgrades engineered to handle high torque loads. ATS Stage 6 transmissions are built with billet input shafts, upgraded clutch packs, reinforced internal components, and precision calibration to maximize holding capacity and reliability.
Built for competition-level power and serious towing applications, this transmission package is ideal for trucks pushing beyond stock limits. Whether you're hauling heavy loads or running high horsepower tunes, the ATS Stage 6 Allison package ensures your drivetrain can handle the demand.
FAQ
What is included in the ATS 309-865-4272 package?
This package includes a fully built ATS Stage 6 Allison LCT1000 transmission and an ATS Five Star torque converter.
What makes the Stage 6 transmission different?
Stage 6 units include billet internal components, upgraded clutch packs, and are designed for extreme horsepower and heavy-duty use.
Is this transmission suitable for high horsepower builds?
Yes. ATS Stage 6 transmissions are designed specifically for high-performance and competition-level applications.
Does this transmission support PTO?
Yes. This specific model is built for 4WD trucks equipped with PTO functionality.
Will this fit my truck?
This transmission fits 2003 to early 2004 GM Silverado and Sierra trucks equipped with the 6.6L LB7 Duramax and Allison transmission.
FITMENT
2003–Early 2004 Chevrolet Silverado 2500HD 6.6L LB7 Duramax Diesel 4WD with PTO
2003–Early 2004 Chevrolet Silverado 3500 6.6L LB7 Duramax Diesel 4WD with PTO
2003–Early 2004 GMC Sierra 2500HD 6.6L LB7 Duramax Diesel 4WD with PTO
2003–Early 2004 GMC Sierra 3500 6.6L LB7 Duramax Diesel 4WD with PTO
Specifications for ATS 309-865-4272
| Specification | Details |
|---|---|
| Part Number | 309-865-4272 |
| Product Name | ATS Stage 6 Allison LCT1000 Transmission Package |
| Transmission Model | Allison LCT1000 |
| Engine Fitment | 6.6L LB7 Duramax Diesel |
| Vehicle Fitment | 2003–Early 2004 GM 2500HD / 3500 |
| Drive Configuration | 4WD |
| PTO Compatibility | Yes |
| Included Components | Stage 6 Built Transmission, Five Star Torque Converter |
| Performance Level | Stage 6 – Extreme Duty / High Horsepower |
| Construction | 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 |
