Product Description
The ATS 309-853-4272 Stage 5 Allison LCT1000 Transmission Package is the ultimate high-performance upgrade for 2003–early 2004 GM Silverado and Sierra trucks equipped with the 6.6L LB7 Duramax diesel engine. Designed for extreme horsepower, heavy towing, and competition-level performance, this Stage 5 package delivers unmatched strength, durability, and transmission control.
This complete ATS package includes a fully built Stage 5 Allison LCT1000 transmission, ATS Five Star torque converter, and an ATS deep transmission pan. ATS upgrades the internal components with billet shafts, enhanced clutch packs, and precision calibration to handle significantly higher torque loads while maintaining reliable and consistent shifting performance.
The included Five Star torque converter improves torque multiplication and efficiency, while the deep transmission pan increases fluid capacity and cooling—critical for high-load and high-temperature environments. This transmission is specifically configured for 2WD trucks with PTO capability, making it ideal for work trucks, performance builds, and demanding diesel applications.
Engineered for serious diesel enthusiasts and workhorse applications, the ATS Stage 5 Allison package is built to handle extreme conditions where factory transmissions fall short.
FAQ
What is included in the ATS 309-853-4272 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 includes upgraded billet internals, increased clutch capacity, and enhancements designed to handle extreme horsepower and torque levels.
Is this transmission good for high horsepower builds?
Yes. This package is designed for high-performance and competition-level applications as well as heavy towing.
Does this transmission support PTO?
Yes. This unit is built specifically for 2WD trucks equipped with PTO functionality.
Will this fit my truck?
This package fits 2003 to early 2004 GM trucks with the 6.6L LB7 Duramax engine and Allison transmission in a 2WD configuration.
FITMENT
2003–Early 2004 Chevy Silverado 2500HD 6.6L LB7 Duramax Diesel (2WD with PTO)
2003–Early 2004 GMC Sierra 2500HD 6.6L LB7 Duramax Diesel (2WD with PTO)
2003–Early 2004 Chevy Silverado 3500 6.6L LB7 Duramax Diesel (2WD with PTO)
2003–Early 2004 GMC Sierra 3500 6.6L LB7 Duramax Diesel (2WD with PTO)
Specifications for ATS 309-853-4272
| Specification | Details |
|---|---|
| Part Number | 309-853-4272 |
| Product Name | ATS Stage 5 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 | 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 |
