ATS 313-921-4368 Allison Master Rebuild Kit | 2011-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Complete master rebuild kit for LCT-1000
• Includes C1 through C4 Raybestos GPZ clutches
• Upgraded C3 and C4 pistons and retainers
• Includes internal and external transmission filters
• ATS upgraded P1 sun gear bearing included
• All clutch packs redesigned for added strength
• High performance steel and pressure plates
• ATS trim valve and pump kits included
• Designed for 2011–2019 Duramax 6-speed trucks
• Improves reliability under heavy load conditions
• Ideal for towing, racing, or performance builds
• Compatible with GM 2500HD and 3500HD models

Build Your Allison Transmission To Handle Real Power

If your 2011-2019 Duramax-powered Silverado or Sierra is starting to slip, chatter, or just can’t keep up with your demands, it might be time to rebuild it right the first time with the ATS Allison Master Rebuild Kit. This isn’t your average rebuild kit, it’s built for diesel owners who push their trucks with towing, hauling, and performance upgrades that demand more from the drivetrain. With Raybestos GPZ friction clutches from C1 to C4, upgraded C3 and C4 pistons, and pressure plate packs, this kit is designed to hold power and manage heat far better than factory components ever could. Whether you’re trailering a fifth wheel or daily driving with extra horsepower under the hood, this kit gives your transmission the strength to keep up. ATS even includes their upgraded P1 sun gear bearing, which fixes one of the most common failure points in the Allison LCT-1000. From top to bottom, this package is about building confidence, not just restoring function. It’s a smart investment for anyone who wants to future-proof their transmission against real-world abuse.

Engineered To Reinforce Every Key Failure Point

The ATS 313-921-4368 Master Overhaul Kit is a comprehensive solution for rebuilding the Allison LCT-1000 6-speed automatic transmission found in 2011-2019 GM 2500HD and 3500HD Duramax trucks. It includes a full paper and rubber kit, along with both internal and external filters for a complete service. The C1 through C4 clutch packs are built using Raybestos GPZ performance friction materials, providing increased holding power, heat resistance, and longevity over stock clutches. ATS also includes upgraded steel plates, pressure plates, and a C2 clutch drum spring kit to further improve durability under high load. The inclusion of the ATS trim valve kit and their proprietary pump upgrade ensures better fluid control and consistent pressure during demanding shifts. One of the standout components is the upgraded P1 sun gear bearing, which addresses a notorious weak point that often leads to early transmission failure. This rebuild kit is built with precision and long-term performance in mind, making it ideal for heavy-duty use, whether you’re rebuilding due to failure or planning ahead for more power.

Fits: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Designed specifically for 2011–2019 GM 2500HD/3500HD Duramax trucks
• Compatible with Allison LCT-1000 6-speed automatic transmissions only
• Includes upgraded components to address known failure points
• Not intended for use in stock rebuilds without performance upgrades
• Includes both internal and external filters for full transmission service
• Kit includes ATS upgraded P1 sun gear bearing to prevent common failures
• All clutch packs use Raybestos GPZ material for increased durability
• Includes upgraded C3 and C4 pistons and retainers
• Professional installation is strongly recommended for optimal performance
• Ideal for towing, high performance, and heavy-duty use cases