Installing on a drive-on lift leaves to many variables. Are all the tires at equal pressure? Easy to check but are the sidewalls all in perfect condition? If running bias-ply, are the run out lengths/diameters perfectly equal side to side? And for the suspension, are the springs the exact rate side to side? Even brand new springs have tolerances. Also are the springs seated perfectly in their perches?, not likely from an assembly line or any car that has been driven a few miles. And the bushings play a major role. Unless every point of movement is controlled via a heim end there will be binding, no matter how smooth the control arms move through their range of motion. The binding caused by a driver just sitting in the passenger seat can take hours or days for the bushings to recover to their original position if the ever do. Not to mention most cars are not of equal weight side to side so the vehicle will never return to square.