Stage 4 Allison LCT1000 Crate Transmission

Features:

• Complete Stage 4 Allison transmission package
• Fits 2003-2004 6.6L LB7 Duramax 4WD
• Includes ATS Five Star torque converter
• Deep transmission pan for better cooling
• ATS Co-Pilot controller improves shift performance
• Billet input and output shafts for strength
• Designed for heavy towing and performance builds
• Engineered for Silverado and Sierra HD trucks
• Improves reliability under increased power loads
• $500 shipping surcharge applies at checkout

Proven Strength for Your Classic LB7 Duramax

If you’re still running one of GM’s legendary 2003-2004 LB7 Duramax trucks, you already know just how capable these rigs can be. But as the miles and power upgrades add up, the stock Allison transmission can start to fall short. Whether you’re towing heavy, working hard, or looking to extend the life of your setup, the ATS Stage 4 Allison LCT1000 Crate Transmission is designed to give your truck the strength it needs to keep going. Fully assembled and ready to install, this package is made for 4WD Silverado and Sierra HD trucks, delivering serious durability without the guesswork. It’s the perfect solution for anyone who wants to upgrade performance without sacrificing reliability.

Built with ATS Performance Upgrades Inside and Out

This package comes complete with ATS’s most trusted components. The Five Star torque converter is included to help maximize torque transfer and improve drivability under load. It works alongside the deep transmission pan, which increases fluid capacity and helps manage temperatures during demanding use. The ATS Co-Pilot Transmission Controller takes shift quality to the next level, improving pressure control and timing so your truck shifts smoother and holds power better. Inside the transmission, billet input and output shafts replace factory parts known to fail under high torque, giving you peace of mind when you need it most. This package is designed to help your LB7 work harder and last longer. Please note, a $500 shipping surcharge applies at checkout.

Fits: 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 4WD