The Tramec Sloan Lift Axle Control Module Ready for Installation! Tramec SloanÕs Lift Axle Control Module Reduces Parts by 50% Compared to Other Lift Axle Circuitries Designed to Electronically Control the Raising and Lowering of a Lift Axle by Inflating & Deflating the Air Bags.The Module Incorporates a 4-Way Valve, Regulator, DOT Cartridge Push-In Fittings, Automatic Solenoid, and Air Gauge.