B&M Pro Ratchet Shifters are premium precision ratchet action shifters with racing inspired style and performance. They work with either standard or reverse pattern valve bodies â and are extremely stout and easy to operate with just one hand! The shifters feature a reverse lockout that meets NHRA and IHRA requirements. The Pro Ratchet Shifters offer the easiest "double-shifting" with an air, electric or CO2 shift solenoid. They fit most 3-speed and 4-speed transmissions and come packaged with a brushed aluminum cover and a 5 foot Super Duty race cable.