The Eaton Fuller Manual RTXF20918B is a 18-speed manual transmission listed for vocational applications. Recorded for RTXF20918B: brand Eaton, family Eaton Fuller Manual, series Fuller, type manual, speed 18-speed, application vocational. Gear ratios, torque ratings, and interchange details are verified per unit against your tag or VIN rather than published here. Availability: Available Now.