Product Description
The ATS 309-842-4272 Stage 4 Allison LCT1000 Transmission Package is a high-performance upgrade for 2003–early 2004 6.6L LB7 Duramax trucks, designed to handle aggressive street driving, heavy towing, and moderate competition use. This 2WD transmission package significantly improves durability and power handling over the factory Allison transmission.
Built with upgraded internal components and increased clutch capacity, the Stage 4 package delivers stronger torque holding capability, improved shift quality, and long-lasting reliability under demanding conditions. Paired with the ATS Five Star torque converter and deep transmission pan, this system ensures efficient power transfer and superior cooling.
This is a complete transmission solution engineered for trucks producing substantially more power than stock while maintaining excellent drivability for daily use and towing applications.
FAQ
Q: What is the difference between Stage 4 and Stage 5?
A: Stage 4 is designed for high-performance street and towing applications, while Stage 5 includes additional billet internals for extreme horsepower builds.
Q: Is this transmission suitable for towing?
A: Yes, it is built for heavy towing and improved reliability compared to the factory transmission.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved efficiency and torque multiplication.
Q: How much power can this transmission handle?
A: This Stage 4 transmission is ideal for high horsepower street builds and towing setups, typically supporting significantly increased power over stock applications.
Fitment
- 2003 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- 2003 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- Early 2004 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- Early 2004 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
Key Features
- Increased clutch capacity for higher torque handling
- Improved shift firmness and durability
- ATS Five Star torque converter included
- Deep transmission pan for better cooling
- Upgraded internal components for long-term reliability
- Designed for towing, daily driving, and performance use
Specifications for ATS 309-842-4272
| Specification | Details |
|---|---|
| Part Number | 309-842-4272 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax LB7 |
| Model Years | 2003 - Early 2004 |
| Horsepower Rating | Up to 700-800 HP (Estimated) |
| Torque Capacity | Significantly Increased Over Stock |
| Shipping Weight | Approximately 400 lbs |
| Shipping Method | Freight (Core Charge Applies) |
| Warranty | 5 Year / 500,000 Mile Limited Warranty |
| California Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
