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 and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator 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 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 and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator 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 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 and the second actuator mount and actuatable between an extended position and a retracted position; wherein in the extended position, the pylon conversion actuator 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 that is approximately perpendicular with the wing . <EOS>