Abstract: A tunable air spring/shock absorber comprises a cylinder, a piston rod extending out of the cylinder through a lower end thereof, and rod guide provided on the lower end of the cylinder for guiding the piston rod, a seal mounted on the rod guide and piston containing valving components to deliver desired force-velocity characteristics for rebound and compression mounted on the piston rod. The piston is submerged in oil during the complete stroke of the air spring/shock absorber. On top of the piston, a spacer is provided which separates a sealing disk or piston that hermetically separates a counter spring chamber and a main spring chamber. The tunable air spring/shock absorber has an upper closure on the cylinder with a valve that allows pressurization of the main spring chamber.