Circle D GM 245mm Pro Series 8L90 Torque Converter

Circle D Specialties GM 245mm Pro Series 8L90 Torque Converter

The Circle D Specialties GM 245mm Pro Series 8L90 Torque Converter is the ultimate high-performance upgrade for enthusiasts seeking lightning-fast engine response and explosive launches from their modern GM vehicle. Featuring a highly compact 245mm diameter, this converter drastically reduces rotational mass compared to a bulky factory unit. This lightweight footprint allows your engine to rev faster and flash instantly into its optimal powerband, making it perfect for aggressive street cars and weekend track warriors equipped with an 8L90 transmission.

Engineered to handle serious power and aggressive shifting, this Pro Series converter features a rigid billet front cover and a billet apply piston, completely eliminating the flex and ballooning issues common with stamped factory components. Crucially, it utilizes a Triple Clutch Lockup assembly, providing unmatched holding capacity during wide-open throttle (WOT) lock-up tuning on modern 8-speed applications. Inside, heat-treated steel splines and a flanged style hub ensure superior anti-flex durability, while the assemblies are fully furnace brazed with hand TIG welded fins. Pair it with an optional heavy-duty Billet Flexplate for LS or Gen-V LT engines to complete your bulletproof drivetrain package.

Key Features & Upgrades

• Designed specifically for GM 8L90 transmissions
• Compact 245mm diameter for drastically reduced rotational mass and faster throttle response
• Triple Clutch Lockup for extreme holding capacity during wide-open throttle (WOT) shifts
• Rigid billet front cover and billet apply piston prevent flexing and ballooning
• Heat-treated steel splines and flanged style hub for maximum durability
• Optional Billet Flexplate: Available for LS or Gen-V LT Engines
• Fully furnace brazed internals with hand TIG welded fins
• Hand-assembled to exacting tolerances for dominant track performance

Specifications

• Application: High-Performance Street/Strip Torque Converter
• Transmission Compatibility: GM 8L90
• Converter Diameter: 245mm
• Construction: Billet Front Cover & Apply Piston, Furnace Brazed, Hand TIG Welded Fins
• Lockup Type: Triple Clutch
• Hub Style: Flanged Hub with Heat Treated Steel Splines
• Options: Multiple Stall Speeds (3200 up to 4200 RPM), Bolt Pattern Options, and Billet Flexplate available

Notes

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