ATS 309-852-4272 Stage 5 Allison LCT1000 Crate Transmission | 2003-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 2WD

Features:

• Built for 2003-2004 2WD LB7 Duramax
• Includes ATS Five Star torque converter
• Heavy-duty billet input shaft included
• Billet intermediate shaft for added strength
• Billet P2 carrier and C2 hub upgrade
• Modified P1 sun gear enhances durability
• Deep transmission pan increases fluid capacity
• Improves cooling and heat dissipation
• Comes with ATS Co-Pilot transmission controller
• Optimized for high horsepower applications
• Delivers firm shifts and better power transfer
• $500 freight surcharge applies to shipping

Push Your Power Further With Confidence And Control

If you’ve been searching for a serious transmission upgrade for your early 2003-2004 Duramax LB7, this is where the game changes. The ATS Stage 5 Allison LCT1000 Crate Transmission is purpose-built to handle power far beyond stock without compromising drivability. Whether you're pushing high horsepower on the street or laying down torque at the track, this setup delivers firm, confident shifts and eliminates weak points that plague stock units. It comes loaded with proven ATS components, including their Five Star torque converter, Co-Pilot transmission controller, and a deep pan for improved cooling. From towing heavy loads to daily driving with a tuned truck, this transmission gives you the strength and reliability you need to enjoy the performance you’ve worked so hard to build. You’ll notice faster engagement, more efficient power delivery, and peace of mind knowing your drivetrain is built to last. If you’re ready to step up, this kit is built to take you there.

Engineered To Withstand The Demands Of High Torque Builds

The ATS Stage 5 Allison LCT1000 Transmission Package is built with precision for the 2003 to early 2004 2WD Duramax LB7 platform. At its core is a fortified assembly featuring a billet input shaft and billet intermediate shaft that offer superior resistance to twisting and fatigue under high stress. A billet P2 planetary carrier, C2 hub, and a modified P1 sun gear all work together to improve internal strength and power transfer, especially under elevated torque levels. The package includes ATS’s Five Star torque converter, delivering maximum efficiency and multiplying torque without slipping under heavy load. Also included is the deep transmission pan that increases fluid capacity and cooling, an essential feature for heat management during towing or aggressive driving. The ATS Co-Pilot transmission controller helps regulate line pressure for consistent, reliable shifting under all conditions. This is a full transmission solution designed for upgraded performance and enhanced longevity in high-demand builds.

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

Notes:

• Designed specifically for 2003 to early 2004 LB7 Duramax engines with 2WD.
• Includes a $500 shipping surcharge, factored into total cost.
• Built to handle significantly more power and torque than stock transmissions.
• Machined billet components offer enhanced strength and durability under high stress.
• Installation requires compatible 2WD configuration with PTO provisions.
• Co-Pilot transmission controller improves shift timing and line pressure control.
• Five Star torque converter increases torque multiplication and minimizes slippage.
• Not a basic rebuild, this is a fully upgraded performance crate transmission package.
• May require supporting mods for optimal performance (e.g., tuned ECM, upgraded fueling).
• Intended for performance use, ideal for towing, racing, or high-horsepower builds.