Vibration Feel sever vibration through steering wheel at all speeds.

SOURCE: intermittent clunking in front end

pt cruiser are famous for lower control arm bushings they go bad take a tire iron and pry on the lower A-arm by thbushing and see if you have play

SOURCE: 2006 Ford Ranger vibration on steering wheel and noise @ 110 Km/h

Check the idler arm and pittman arm, then the tie rod ends for ANY play. The pittman arm is the one on the steering gearbox that connects to the tie rod, and the idler arm is the one that connects from the tie rod to the frame. Replacing the parts is a pretty inexpensive and straightforward job, but you will need to have the wheels re-aligned afterwards.

SOURCE: front end vibration

your alignment could be off

SOURCE: Knocking noise in steering wheel

heve you checked your steering fluid? if the fluid is of check the bearing of steering pump and also the bearing of the tensioner.

SOURCE: car vibrates at slow speed, veering to the

check tyres for wear-wheel balance needed if visibly ok-have a wheel alignment after a tyre rotation-best even tyres to be put on fronts-they will carry out a safety check all suspension and steering before doing the wheel alignment