ATS 309-865-4290 Stage 6 Allison LCT1000 Crate Transmission | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY PTO 4WD

Features:

• Built for 2004.5–2005 LLY Duramax engines
• Includes billet input, output, and intermediate shafts
• Comes with ATS Five Star torque converter
• Features a deep transmission pan for better cooling
• ATS Co-Pilot controller improves shift performance
• Billet P2 carrier and billet C2 hub included
• Modified P1 sun gear enhances durability under load
• Designed for heavy towing and high performance
• Fully assembled crate transmission for easy install
• Optimized for 4WD trucks with PTO compatibility
• Supports high torque and tuned engine builds
• $500 shipping surcharge added at checkout

Make Your LLY Duramax Feel Like New Again

If your 2004.5–2005 Duramax is starting to slip, shudder, or feel like it’s lagging under load, it might be time for a serious upgrade. The ATS Stage 6 Allison LCT1000 Crate Transmission brings your truck back to life with the kind of strength and smoothness you can feel from the first shift. Built specifically for 4WD trucks with PTO, this transmission package is designed for those who tow, tune, and push their trucks harder than stock parts were ever meant to handle. The package comes fully assembled with a Five Star torque converter, deep transmission pan, and ATS’s Co-Pilot controller, so you’re getting performance and control in one complete solution. Whether you're pulling heavy trailers or driving daily with extra horsepower, this setup keeps your shifts clean and your power consistent. It’s built for reliability, built for performance, and built for trucks that work just as hard as you do. You’re not just replacing a transmission, you’re giving your truck the muscle it deserves.

Reinforced Components Matched With Precision Control

The ATS 309-865-4290 Stage 6 Transmission is engineered to handle the demands of the 2004.5–2005 LLY Duramax platform, delivering serious upgrades in durability, torque handling, and shift control. Inside the transmission, you’ll find billet input, output, and intermediate shafts that dramatically reduce failure points common in high-load situations. The billet P2 carrier and billet C2 hub are paired with a modified P1 sun gear to increase structural integrity and gear engagement across a range of driving conditions. The Five Star torque converter is designed to improve torque multiplication and reduce slippage, offering tighter performance whether you’re towing or tuned. Supporting this hardware is the ATS Co-Pilot transmission controller, which intelligently manages line pressure and shift timing to protect clutches and improve drivability. The deep transmission pan helps regulate temperature with greater fluid capacity, which is essential during long hauls or tough work environments. This crate transmission comes pre-assembled and is optimized for 4WD trucks with PTO, making it a drop-in upgrade for serious diesel owners. It’s a high-performance package that turns your LLY into the reliable powerhouse it was meant to be.

Fits: 2004.5, 2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY PTO 4WD

Notes:

• Designed for 2004.5–2005 6.6L LLY Duramax engines
• Fits GM Silverado and Sierra 2500HD/3500HD 4WD models with PTO
• Transmission ships as a fully assembled crate unit
• Includes ATS Five Star torque converter and deep pan
• ATS Co-Pilot controller improves shift quality and longevity
• Engineered with billet internals for high torque applications
• Ideal for towing, high horsepower, and heavy-duty use
• Requires proper supporting mods for best performance
• Not a remanufactured unit, fully upgraded crate transmission
• $500 shipping surcharge will be added at checkout