Abstract: A pneumatic jack comprising a cylinder having a removable cover, an inlet for pressurized gas near the bottom of the cylinder, a piston having a resilient piston cup within the cylinder and positioned for vertical movement therein, the cover including a centrally positioned piston rod bushing and at least two laterally offset stabilizer rod bushings, the bushings extending above and below the cover, a piston rod secured to the piston and extending through the piston rod bushing, and at least two stabilizer rods also secured to the piston and extending through the stabilizer rod bushings, and helical springs surrounding each of the stabilizer rods and engaging the piston and the cover for urging the piston downwardly within the cylinder.