Circle D GM 258mm Pro Series 10L90 Torque Converter - 2019+ L87/L84

Circle D Specialties GM 258mm Pro Series 10L90 Torque Converter - 2019+ L87/L84

The Circle D Specialties GM 258mm Pro Series 10L90 Torque Converter is a highly versatile, precision-engineered upgrade designed specifically for 2019+ GM vehicles equipped with the L87 or L84 engines and the heavy-duty 10L90 transmission. The 258mm (10 1/4-inch) diameter offers a perfect middle ground—significantly reducing rotational mass for lightning-fast throttle response and quick acceleration off the line, while maintaining enough surface area for excellent streetability and highly efficient torque transfer in modern, high-horsepower trucks and SUVs.

Engineered to deliver massive value and handle aggressive tuning, this Pro Series converter features a rigid billet front cover and a billet piston to completely eliminate the flex and ballooning issues common with stamped factory components under heavy load. Inside, a flanged impeller hub ensures superior anti-flex durability, while the internal assemblies are fully furnace brazed and feature a hand TIG welded turbine hub for maximum structural integrity. Upgraded with heavy-duty Torrington bearings and hand-assembled to exacting tolerances, this converter delivers dominant, consistent performance whether you are towing, street driving, or tearing up the track.

Key Features & Upgrades

• Designed specifically for 2019+ GM L87 and L84 applications with the 10L90 transmission
• 258mm (10 1/4") diameter delivers a superior balance of rapid engine response and streetable torque holding
• Rigid billet front cover and billet piston prevent flexing and ballooning
• Flanged impeller hub engineered for superior anti-flex durability
• Fully furnace brazed internals with a hand TIG welded turbine hub
• Heavy-duty Torrington bearings for smooth, reliable operation
• Hand-assembled to exacting tolerances for unmatched precision and performance

Specifications

• Application: High-Performance Street/Strip Torque Converter
• Transmission Compatibility: GM 10L90 (2019+ L87/L84 Specific)
• Converter Diameter: 258mm (10 1/4")
• Construction: Billet Front Cover & Piston, Furnace Brazed, Hand TIG Welded Turbine Hub
• Bearings: Torrington Bearings
• Options: Multiple Stall Speeds (2800 up to 5000 RPM) available

Notes

• Custom manufactured product built to your exact specifications.
• Estimated lead time: 3-4 weeks.