to upper shell 12 any force urging lower piston shell 14 downward causes further locking of the collar 28 around the piston shell upon deenergization of solenoid 14 and in some cases upward movement of piston shell 14 springs 34 and 36 return collar 28 to its upper nonlocking position fig3 illustrates the preferred circuitry for the energization of the solenoids it is understood that a separate shock absorber lock is applied to each of the four wheels the corresponding solenoids of the four shock absorber locks are illustrated at 40 48 50 and 52 in fig3 auto battery 54 is grounded on one side to the frame of the automobile as is conventional the other side of the battery is connected to four point selector switch 56 which has its four points connected respectively to the four solenoid coils the other sides of the four solenoid coils are connected to ground so that when the selector switch is turned to a particular solenoid that solenoid is energized by the automobile battery in addition selector switch 56 has a 34 reset 34 or 34 off 34 position 58 for when it is desired that none of the solenoids be actuated each of the four solenoids is the same and it is seen that solenoid 40 has a high force winding 60 and a low force winding 62 connected in parallel together these windings have adequate force capability to pull.