This line of performance converters was developed to work with many Chrysler, GM and Ford late model lock-up and non-lock-up transmissions. These transmissions can offer many advantages to performance enthusiasts, including lower initial gear ratios and overdrive gear for lower highway rpm and improved mpg. The Super StreetFighter? lock-up series allows the car owner to have to 4000 RPM speeds (depending on application) while still enjoying all the benefits of a mechanical lock-up converter.