ATS 309-855-4272 Stage 5 Allison LCT1000 Crate Transmission | 2003-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 PTO 4WD

Features:

• Fits 2003–2004 GM 2500HD/3500HD 4WD with PTO
• Designed for 6.6L Duramax LB7 engines
• Includes ATS-built Allison LCT1000 transmission
• Features billet input and output shafts
• Billet intermediate shaft for added durability
• Comes with ATS Five Star torque converter
• Deep transmission pan improves cooling capacity
• ATS CoPilot controller enhances shift performance
• Ideal for heavy towing and performance applications
• Supports high horsepower and torque output
• Engineered to outperform factory Allison setup
• $500 shipping surcharge applies at checkout

Built To Unleash Your LB7 With Confidence And Control

If you're driving a 2003–2004 GM Duramax LB7 4WD truck and want a transmission that can keep up with your power goals, the ATS Stage 5 LCT1000 Crate Transmission Package is ready to raise the bar. Whether you’re pulling heavy loads, pushing serious horsepower, or just demanding more durability than stock ever offered, this package is built for the job. It includes everything you need to transform your drivetrain, starting with a fully upgraded ATS-built LCT1000 transmission. You also get the ATS Five Star torque converter for efficient torque transfer and firm lockup under power. Billet input, output, and intermediate shafts give you bulletproof strength where it matters most. Pair that with the ATS deep transmission pan and CoPilot controller, and you’ve got a system that cools better, shifts smarter, and lasts longer. If you're tired of wondering whether your factory transmission will hold up, this package takes the guesswork out of the equation and replaces it with proven reliability.

Designed To Withstand High Load Stress And PTO Demands

The ATS 309-855-4272 Stage 5 Allison LCT1000 Crate Transmission is purpose-built for 2003 to early 2004 GM 2500HD and 3500HD trucks equipped with the 6.6L Duramax LB7 engine and 4WD with PTO functionality. It features a fully built Allison LCT1000 transmission that incorporates proprietary ATS upgrades for superior strength and heat resistance. This package includes billet input, output, and intermediate shafts that provide added torsional integrity under high torque loads and demanding towing conditions. The Five Star torque converter delivers excellent torque multiplication with minimal slippage, ideal for high-performance street use and heavy-duty applications. To ensure consistent cooling, the deep transmission pan increases fluid capacity, and the CoPilot transmission controller optimizes shift timing and pressure for smoother, more efficient gear changes. This transmission setup is engineered to exceed OEM performance expectations and is particularly beneficial for PTO-driven systems requiring stable power delivery. With added durability and enhanced shift management, it’s the ideal long-term solution for both work and performance builds.

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

Notes:

• Fits 2003–early 2004 GM Silverado/Sierra 2500HD and 3500HD with 6.6L LB7 Duramax
• Built specifically for 4WD trucks equipped with PTO functionality
• Includes fully upgraded ATS-built Allison LCT1000 transmission
• Designed for heavy towing and high-performance applications
• Features billet input, output, and intermediate shafts for maximum strength
• Comes with ATS Five Star torque converter for improved power transfer
• Deep transmission pan increases fluid capacity and cooling efficiency
• Includes ATS CoPilot transmission controller for enhanced shift quality and control
• Recommended for users requiring greater durability and drivetrain longevity
• A $500 shipping surcharge will be applied at checkout