Circle D GM 245mm Pro Series PG/350/400 Torque Converter

Circle D Specialties GM 245mm Pro Series PG/350/400 Torque Converter

The Circle D Specialties GM 245mm Pro Series PG/350/400 Torque Converter is a premium, high-performance upgrade designed for hardcore street and strip vehicles equipped with a GM Powerglide, TH350, or TH400 transmission. Featuring a highly versatile screw-on pilot and multiple bolt pattern options, this converter can be easily adapted for use with classic early GM engines as well as modern LS and Gen-V LT powerplants. The compact 245mm diameter drastically reduces rotational mass, allowing your engine to flash instantly into its powerband for explosive launches and rapid acceleration.

Engineered to survive extreme track abuse, this Pro Series converter features a rigid CNC-machined billet steel drive cover, a billet steel pump hub, and a billet steel turbine hub. The internal assemblies are fully furnace brazed with TIG welded reinforcement on the impeller and turbine fins in high-stress areas. An integrated anti-ballooning plate comes standard, but for builders running extreme boost or heavy nitrous, an optional Heavy Duty Upgrade is available, adding extra impeller balloon plating and heavy-duty welding for absolute bulletproof reliability.

Key Features

• Designed for GM Powerglide (PG), TH350, and TH400 transmissions
• Innovative screw-on pilot allows adjustability for early GM or modern LS / Gen-V LT setups
• Compact 245mm diameter for reduced rotational mass and faster throttle response
• Rigid CNC-machined billet steel drive cover with integrated anti-ballooning plate
• Optional Heavy Duty Upgrade: Adds additional impeller balloon plating and heavy-duty welding
• Fully furnace brazed with TIG welded impeller & turbine fins in high-stress areas
• Billet steel pump hub and billet steel turbine hub for unmatched strength
• Custom HD deep groove ball bearing turbine support and roller bearings on both sides of the stator

Specifications

• Application: High-Performance Street/Strip/Race Torque Converter
• Transmission Compatibility: GM Powerglide, TH350, TH400
• Converter Diameter: 245mm
• Construction: Billet Drive Cover, Furnace Brazed, TIG Welded
• Bearings: Custom HD Deep Groove Ball Bearing & Dual Stator Roller Bearings
• Options: Multiple Bolt Patterns, Stall Speeds (2,800 - 5,000+ RPM), and Heavy Duty Upgrade available

Notes

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