For '70-'79 Ford C4 Transmissions (10.5" Bolt Circle, 26-Spline, Dipstick Goes Into Transmission Case) This exciting torque converter series is designed with both the street rodder and performance enthusiast in mind. Economically priced and intended for use in stock or mildly modified engines, the Street Rodder™ Torque Converter improves drivability and offers smooth in-gear idle without adversely affecting gas mileage. Fully streetable with no modifications required, the Street Rodder™ can provide a 300-400 RPM increase in stall over stock. 300-400 RPM Increase in Stall Over Stock Quicker Acceleration Improved Low End Power & Smoother Running In Stock Or Mildly Modified Engines