Stage 1 Allison LCT1000 Crate Transmission

Features:

• Includes ATS Stage 1 performance transmission
• Built for 2011–2016 Duramax LML 2WD trucks
• Comes with ATS Five Star torque converter
• Includes ATS deep transmission pan
• Designed for stock to mildly tuned engines
• Improves towing capacity and drivability
• Upgraded internal components for better strength
• Helps manage heat with increased fluid capacity
• Enhances shift quality and transmission reliability
• Ideal for work trucks and daily drivers
• Built and tested in the USA by ATS Diesel
• Professional installation is highly recommended

Your Truck Deserves A Transmission That Can Keep Up

When you put your LML Duramax to work every day, the last thing you want to worry about is your transmission holding you back. The ATS Stage 1 Allison LCT1000 Crate Transmission gives your 2011–2016 Silverado or Sierra the durability and performance it deserves to handle heavy towing, hauling, or a little extra horsepower from tuning. This setup comes complete with ATS’s legendary Five Star torque converter and a deep transmission pan to help control temperatures during long pulls or tough jobs. It is built to deliver cleaner shifts, better throttle response, and reliable power transfer when your truck needs it most. Whether you are pulling heavy loads to the jobsite or heading across the country with a trailer in tow, this transmission package offers the kind of confidence you can feel every time you hit the accelerator. It keeps drivability smooth without sacrificing strength. If you are ready to match your truck’s power with a transmission built for real-world demands, this upgrade checks every box.

Built To Improve Torque Handling And Heat Management

The ATS 309-812-4362 Stage 1 Transmission package is specifically designed to meet the needs of 2011–2016 GM 2500HD and 3500HD trucks equipped with the 6.6L Duramax LML engine and a two-wheel drive layout. It includes an upgraded Allison LCT1000 transmission that uses stronger clutch packs and enhanced valve body calibration to better handle increased torque from towing or mild tuning. The included ATS Five Star torque converter improves torque multiplication, helping to deliver stronger and more efficient power to the wheels while minimizing slippage under heavy loads. The deep transmission pan increases fluid capacity and improves heat dissipation, critical for trucks that regularly tow or see extended periods of heavy use. This system is ideal for owners who want to boost performance without compromising drivability or reliability. Whether your truck sees duty hauling trailers, carrying loads, or just surviving the daily grind, this transmission is a reliable upgrade that brings measurable improvements to strength and cooling. Every component is built and tested in the USA by ATS Diesel for long-term performance you can trust.

 Fitment: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML 2WD

Notes:

• Designed specifically for 2011–2016 GM 2500HD and 3500HD trucks with 6.6L Duramax LML engines and 2WD.
• Package includes ATS Stage 1 transmission, Five Star torque converter, and deep transmission pan.
• Recommended for trucks with stock or mildly tuned engines.
• Ideal for daily driving, towing, and moderate performance builds.
• Not intended for extreme performance or race-level horsepower applications.
• Professional installation is strongly recommended to ensure proper function and warranty support.
• Torque converter improves power transfer and reduces slippage under load.
• Deep pan increases fluid capacity and helps manage transmission temperatures.
• Transmission may have firmer shift characteristics compared to the factory unit.
• Built and tested in the USA by ATS Diesel for reliability and durability.
• A $500 shipping surcharge will be added at checkout and is not included in the listed product price.