ATS 309-814-4440 Stage 1 Allison LCT1000 Crate Transmission | 2017-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P 4WD

Features:

• Includes ATS Stage 1 Performance Transmission
• Compatible with 2017–2019 GM Silverado and Sierra
• Built for 6.6L Duramax L5P 4WD models
• Includes ATS Five Star torque converter
• Features ATS deep transmission pan
• Designed for improved durability and performance
• Upgraded clutch packs for higher torque capacity
• Improves towing performance and daily drivability
• Transmission tuned for smooth and firm shifts
• Reduces transmission heat with deep pan design
• Ideal for stock to mild performance upgrades
• Built by ATS Diesel in the USA

Upgrade Your Duramax Without Second Guessing It

If your L5P Duramax is tuned, tows heavy, or is just worked harder than average, upgrading the transmission is one of the smartest moves you can make. The ATS Stage 1 Allison LCT1000 Crate Transmission is designed to give your 2017–2019 Silverado or Sierra the strength it needs without overcomplicating your build. Whether you’re hauling up steep grades or putting miles on long highway pulls, this transmission holds firm, shifts clean, and delivers confidence every time you hit the throttle. It comes complete with ATS’s Five Star torque converter and a deep transmission pan that helps manage heat under load. You’ll notice smoother transitions between gears, more consistent performance, and a stronger response when it matters most. It’s the perfect match for a daily driver that doubles as a weekend warrior or workhorse. If you’ve outgrown what your factory setup can handle, this is the next logical step.

Built To Handle More Power With Less Stress

The ATS 309-814-4440 Stage 1 Allison LCT1000 Crate Transmission package includes three key components designed to enhance drivetrain reliability and performance in 2017–2019 GM 2500HD and 3500HD trucks with the 6.6L Duramax L5P. At the core is the upgraded Allison LCT1000 transmission, which features reinforced internals and optimized shift calibration to support moderate tuning and towing demands. The included Five Star torque converter is engineered for improved torque multiplication and reduced slippage, making it ideal for trucks that see frequent load changes. The deep transmission pan increases fluid capacity, allowing better heat dissipation during extended use or when under strain. This system is well-suited for stock to mildly modified engines and provides a significant boost in overall drivetrain stability. Whether you are hauling a trailer daily or need a transmission that holds up under aggressive throttle, this package offers the balance of strength, cooling, and drivability you are looking for. With ATS’s proven performance pedigree, it’s built to go the distance.

Fits: 2017, 2018, 2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P 4WD

Notes:

• Designed specifically for 2017–2019 GM 2500HD and 3500HD trucks with the 6.6L Duramax L5P engine and 4WD configuration.
• Includes ATS Stage 1 transmission, Five Star torque converter, and ATS deep transmission pan.
• Recommended for stock to mildly tuned engines and light to moderate towing applications.
• This is a performance transmission and may shift firmer than stock in certain conditions.
• Core charge and shipping surcharge may apply at checkout; confirm total cost before purchasing.
• Professional installation is highly recommended to ensure proper fitment and functionality.
• Upgraded internals and converter design improve torque handling and reduce slip under load.
• Deep pan increases fluid capacity to help reduce transmission temperatures.
• Transmission is built and tested by ATS Diesel in the USA.
• Verify compatibility with your vehicle’s VIN and drivetrain setup before ordering.