The Hays Twister 3/4 Race torque converter is built for street/strip Ford C4 Case-Filled combinations that have outgrown a stock converter. Its 2800-3200 RPM stall range suits engines with higher compression, an aftermarket camshaft or cylinder heads, deeper rear gears or a lighter vehicle, and it sits just shy of a full race converter in character.

Hays 97-2D28Q Twister 3/4 Race Torque Converter Features:

• Designed for Ford C4 Case-Filled automatic transmissions
• 10 in. diameter with 2800-3200 RPM stall speed
• 24 spline input
• 10.500 in. bolt circle
• 1.375 in. crank pilot diameter
• Balanced; non-lockup; no anti-balloon plate
• Built, tested and proven to support up to 650 horsepower
• Internally welded construction instead of brazing for longer converter life and consistency
• Spray welding in select areas adds strength through process hardening
• Heavy duty Torrington bearings for strength and durability
• High flow stator vents and channels promote cooling in higher horsepower applications
• Single application design saves weight compared to multi-bolt pattern converters
• Hand-built and inspected at every step of assembly
• Not designed for use with nitrous oxide or a trans-brake
• External transmission cooler recommended (minimum 18,000 GVW or 15,000 BTU rating)
• Stall speed varies with engine setup, vehicle weight and gear ratio
• Use Grade 8 3/8-16 converter bolts, 3/4 in. to 1 in. long