Product Description
The ATS 309-855-4272 Stage 5 Allison LCT1000 Transmission Package is a top-tier performance transmission solution designed for 2003–early 2004 GM trucks equipped with the 6.6L LB7 Duramax diesel engine, 4WD drivetrain, and PTO capability. Built to handle extreme horsepower, heavy towing, and high-stress applications, this package delivers maximum strength, durability, and performance.
This Stage 5 package includes a fully built ATS Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan. ATS upgrades critical internal components including clutch packs, shafts, and valve body modifications to significantly increase torque capacity and eliminate common factory failures.
The included Five Star torque converter improves torque multiplication and efficiency, while the deep transmission pan increases fluid capacity and cooling performance. Together, these components ensure consistent performance under the most demanding conditions, making this package ideal for high-performance builds, competition use, and heavy-duty towing.
FAQ
What does the ATS Stage 5 package include?
This package includes a fully built Stage 5 Allison LCT1000 transmission, ATS Five Star torque converter, and ATS deep transmission pan.
What makes the Stage 5 transmission different?
Stage 5 units feature upgraded internal components, increased clutch capacity, and performance modifications designed to handle extreme horsepower and torque.
Is this transmission suitable for high horsepower builds?
Yes. This package is designed for high-performance applications, including heavily modified trucks and competition use.
Does this transmission support PTO?
Yes. This specific model is built for 4WD trucks equipped with PTO functionality.
What vehicles does this fit?
It fits 2003 to early 2004 GM trucks with the 6.6L LB7 Duramax diesel engine, Allison LCT1000 transmission, and 4WD configuration.
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 309-855-4272
| Specification | Details |
|---|---|
| Part Number | 309-855-4272 |
| 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 | 4WD |
| PTO Compatibility | Yes |
| Included Components | Stage 5 Built Transmission, Five Star Torque Converter, Deep Transmission Pan |
| Performance Level | Stage 5 (Extreme Duty) |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Freight Shipping Required |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
