SunCoast 10L1000-XD-3D Extreme Duty Allison 10 Speed Triple Disc Billet Torque Converter | 2020-2025 GM 2500HD/3500HD 6.6L Duramax L5P

Features:

• CNC billet apply piston for stronger clamping
• CNC billet front cover for added durability
• CNC billet stator for improved efficiency
• Furnace brazed turbine and pump fins
• Tig welded fin assembly for rigidity
• 4140 HTSR billet converter hub and spline
• 33% more apply area than factory
• Higher friction clutch paper for reliability
• Three-year unlimited mileage warranty
• Hand assembled in the USA

Built for the Demands of Real-World Power

If you push your truck to work as hard as you do, the SunCoast 10L1000-XD-3D Extreme Duty Torque Converter is the kind of upgrade that transforms how your Allison 10-speed transmission handles power. Designed specifically for the 2020-2025 GM 2500HD and 3500HD with the 6.6L Duramax L5P, this converter delivers strength, precision, and reliability in one package. Whether you’re towing at max capacity, hauling through steep grades, or putting down serious power on the track, it’s built to keep pace without missing a beat. By replacing the factory setup with CNC-machined billet components, it ensures more clamping force, smoother shifts, and less slip, which means more of your engine’s power actually makes it to the wheels. Every part of this converter has been designed to withstand extreme conditions while keeping drivability refined for everyday use.

Engineering That Doesn’t Cut Corners

This torque converter isn’t just heavy-duty in name, it’s engineered from front to back with durability in mind. The billet apply piston, front cover, and stator are CNC machined for unmatched strength and precision, while furnace-brazed turbine and pump fins prevent failure under high loads. A 4140 HTSR billet hub and turbine spline provide the backbone for long-term reliability, and the triple disc clutch design offers 33% more apply area than the factory unit, translating to improved holding power under boost. The higher-friction clutch material means less slippage, keeping temperatures lower and efficiency higher. Even the assembly process reflects the quality: each converter is hand-built in the USA, tested, and backed by a 3-year unlimited mileage warranty. Install it, and you can expect not just better performance, but confidence that your transmission is ready for whatever you throw at it.

Vehicle Fitment: 2020, 2021, 2022, 2023, 2024, 2025 GM 2500HD/3500HD 6.6L Duramax L5P

Application Notes:

• Core charge of $2,000 applies.