ATS 309-852-4290 Stage 5 Allison LCT1000 Crate Transmission | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY 2WD

Features:

• Complete Stage 5 performance transmission package
• Includes ATS Five Star torque converter
• ATS Co-Pilot controller for precise shift control
• Deep pan enhances fluid capacity and cooling
• Billet input and intermediate shafts installed
• Billet P2 carrier and billet C2 hub included
• Modified P1 sun gear for added strength
• Built for 2004.5–2005 2WD LLY Duramax trucks
• Supports heavy towing and high horsepower builds
• Direct bolt-in replacement with upgraded internals
• Ideal for racing, towing, and street performance
• $500 shipping surcharge applies due to freight

Built For The Driver Who Pushes Their Duramax Hard

When your 2004.5–2005 LLY Duramax starts laying down serious power, your stock transmission can only take you so far. The ATS Stage 5 Allison LCT1000 Crate Transmission is the bulletproof upgrade that gives you the confidence to tow heavy, run hard, and daily drive without compromise. This package includes everything you need to transform your drivetrain, from the Five Star torque converter for tighter low-end response to the Co-Pilot controller that delivers crisp, clean shifts under load. It’s built to handle the demands of towing, hauling, and aggressive street driving, while keeping things cool and consistent with the deep transmission pan. Whether you're climbing grades with a trailer or launching off the line, this setup delivers the strength and reliability your build demands. All the internal upgrades are already handled, so you can focus on enjoying the extra performance. If you’re ready to take the weak link out of your truck, this crate transmission is the solution that gets it done right.

A Fully Reinforced Transmission Package Designed For Power & Durability

The ATS 309-852-4290 Stage 5 Allison LCT1000 Crate Transmission is purpose-built for 2WD 2004.5–2005 GM Silverado and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax LLY engine. This transmission is built from the inside out to handle high torque and power output, making it ideal for performance enthusiasts and heavy-duty tow rigs alike. It includes billet input and intermediate shafts, a billet P2 carrier, and a billet C2 hub reinforced with a modified P1 sun gear to handle elevated torque without failure. The included ATS Co-Pilot transmission controller enhances line pressure and shift strategy, allowing the unit to respond intelligently to load and throttle input. The ATS Five Star torque converter boosts low-end torque efficiency, which is especially beneficial when towing or driving in mountainous terrain. A deep transmission pan is also included, increasing fluid capacity and helping reduce heat under heavy use. This transmission is a complete drop-in solution designed to replace and outperform your stock unit in every way. Note that a $500 shipping surcharge applies due to freight handling.

Fits: 2004.5, 2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY 2WD

Notes:

• Designed for 2004.5–2005 GM Silverado/Sierra 2500HD and 3500HD 2WD with 6.6L LLY Duramax
• Includes fully built ATS Stage 5 Allison LCT1000 transmission
• Comes with ATS Five Star torque converter for improved low-end torque response
• Includes ATS Co-Pilot transmission controller for enhanced shift control
• Equipped with billet input and intermediate shafts for added durability
• Billet P2 carrier and billet C2 hub with modified P1 sun gear installed
• Deep transmission pan improves cooling and fluid capacity
• Ideal for high horsepower builds, heavy towing, and performance use
• Complete bolt-in upgrade over factory transmission setup
• A $500 shipping surcharge applies due to freight size