Stage 1 Allison LCT1000 Crate Transmission

Features:

• Fits 2003–2004 GM 2500HD/3500HD 2WD
• Designed for 6.6L Duramax LB7 with PTO
• Includes ATS Stage 1 LCT1000 transmission
• Five Star torque converter for smooth power
• Deep transmission pan improves cooling
• Built for towing and heavy-duty use
• Enhanced durability over stock components
• Supports PTO-driven equipment compatibility
• Smoother shifts and better drivability
• Reliable upgrade for working Duramax trucks

Built for the Job, Designed to Last

If your 2003–2004 GM 2500HD or 3500HD with a 6.6L Duramax LB7 and PTO is ready for a transmission upgrade, the ATS Stage 1 Allison LCT1000 Crate Transmission is built to meet that demand. This transmission is purpose-built for 2WD trucks that work hard—whether you’re towing, hauling, or running PTO-driven equipment. ATS takes the proven Allison LCT1000 platform and gives it a performance-focused refresh with better internal components and durability improvements over stock. It’s a great fit for truck owners who need enhanced reliability and smoother performance without stepping into a full performance build. Whether you’re operating around town or logging highway miles under load, this setup delivers confidence and consistency when you need it most.

Upgraded Torque Handling and Cooling Efficiency

The package includes the ATS Five Star torque converter, known for providing firmer lock-up and more efficient power transfer—especially noticeable when climbing grades or pulling trailers. It also comes with a deep transmission pan, which increases fluid capacity and helps manage heat during extended work sessions. Together, these upgrades improve both performance and longevity, reducing strain on your drivetrain while delivering smoother shifts under pressure. Designed specifically for early LB7-powered trucks with PTO functionality, this Stage 1 transmission keeps your work truck moving efficiently without adding unnecessary complexity. It’s the ideal choice for anyone looking to replace a tired stock transmission with something tougher, smarter, and built to handle the demands of real-world work.

Fits: 2003, 2004 GM 2500HD/3500HD 6.6L Duramax LB7 PTO 2WD

Includes:

• ATS 2WD w/ PTO 2003- Early 2004 Allison LCT1000 Performance Transmission
• ATS Allison LCT1000 Five Star Torque Converter (302-950-4248)
• ATS Allison LCT1000 Deep Transmission Pan (301-900-4248)
  

Note: $500 Shipping surcharge will be added at checkout