Steering Systems
Component Recognition
Steering questions usually begin with identifying the system installed. Recirculating-ball gears (common on older RWD cars and trucks) use a worm, ball nut, and sector shaft with a parallelogram linkage: pitman arm, center link, idler arm, and tie rod ends. Rack-and-pinion systems transfer motion directly through the rack to inner and outer tie rod ends and dominate modern vehicles. Knowing which style is present tells you which wear points and adjustments exist.
Hydraulic vs Electric Assist
Hydraulic power steering uses an engine-driven pump; diagnosis centers on both pressure and flow. A restricted hose or worn pump can cause hard steering at low engine speed, stiffness until warm (morning sickness), or a whine that changes with steering input. Check fluid level and aeration first - a foamy reservoir means air is entering, often through a leaking suction-side O-ring. Electric power steering (EPS) uses a motor, torque sensor, and control module; complaints of poor feel are frequently calibration or software issues, not mechanical wear, and a steering angle sensor relearn may be needed after alignment.
Traps
Watch for confusing normal gear lash with excessive free play, and condemning a gear when the noise comes from a worn intermediate shaft or column bearing. Worm bearing preload and sector shaft mesh preload are separate adjustments - overtightening one masks the other and creates binding.
Rule of Thumb
With wheels straight ahead and the engine running, steering wheel free play measured at the rim should not exceed roughly 1 inch (25 mm); more points to tie rod ends, idler arm, or gear wear. Have an assistant rock the wheel while you watch each joint.