A propulsion assembly for a tiltrotor aircraft having a wing, the tiltrotor aircraft operable in a hover flight mode and a forward flight mode, the propulsion assembly comprising: a fixed pylon; a rotor system comprising a rotor system central axis; a pivotable attachment coupling the rotor system to the fixed pylon, the pivotable attachment comprising a conversion axis, wherein the rotor system is configured to selectively rotate about the conversion axis; a pylon conversion actuator comprising: a first actuator mount directly coupled to the fixed pylon; a second actuator mount directly coupled to the rotor system; and an extendable arm coupled to the first actuator mount (110, 122) and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator (110, 122) places the rotor system in a first rotor position; and wherein in the retracted position, the pylon conversion actuator places the rotor system in a second rotor position, characterized in that the first actuator mount is a gimbal mount and the second actuator mount is a clevis mount, the gimbal mount being below and forward of the clevis mount, the gimbal mount and clevis mount being oriented on a vertical axis (126, 226) that is approximately perpendicular with the wing. a fixed pylon; a rotor system comprising a rotor system central axis; a pivotable attachment coupling the rotor system to the fixed pylon, the pivotable attachment comprising a conversion axis, wherein the rotor system is configured to selectively rotate about the conversion axis; a pylon conversion actuator comprising: a first actuator mount directly coupled to the fixed pylon; a second actuator mount directly coupled to the rotor system; and an extendable arm coupled to the first actuator mount (110, 122) and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator (110, 122) places the rotor system in a first rotor position; and wherein in the retracted position, the pylon conversion actuator places the rotor system in a second rotor position, characterized in that the first actuator mount is a gimbal mount and the second actuator mount is a clevis mount, the gimbal mount being below and forward of the clevis mount, the gimbal mount and clevis mount being oriented on a vertical axis (126, 226) that is approximately perpendicular with the wing. a first actuator mount directly coupled to the fixed pylon; a second actuator mount directly coupled to the rotor system; and an extendable arm coupled to the first actuator mount (110, 122) and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator (110, 122) places the rotor system in a first rotor position; and wherein in the retracted position, the pylon conversion actuator places the rotor system in a second rotor position, characterized in that the first actuator mount is a gimbal mount and the second actuator mount is a clevis mount, the gimbal mount being below and forward of the clevis mount, the gimbal mount and clevis mount being oriented on a vertical axis (126, 226) that is approximately perpendicular with the wing.