Circle D GM 258mm Pro Series 8L90 Torque Converter - 2019+ L84

Circle D Specialties GM 258mm Pro Series 8L90 Torque Converter - 2019+ L84

The Circle D Specialties GM 258mm Pro Series 8L90 Torque Converter is a highly versatile, precision-engineered upgrade designed specifically for 2019+ GM vehicles equipped with the L84 engine and 8L90 transmission. The 258mm (10 1/4-inch) diameter offers a perfect middle ground—significantly reducing rotational mass for rapid throttle response and quick acceleration off the line, while maintaining enough surface area for excellent streetability and highly efficient torque transfer in modern trucks and SUVs.

Engineered to deliver massive value and handle aggressive power increases, this Pro Series converter features a rigid billet steel front cover and a billet piston to completely eliminate the flex and ballooning issues common with stamped factory components under 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 for exceptionally smooth and reliable operation, this converter delivers dominant, consistent performance whether you are on the street or the track.

Key Features & Upgrades

• Designed specifically for 2019+ GM L84 applications with the 8L90 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 8L90 (2019+ 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.