Check to make sure the intermediate shaft (the u-joint at the bottom of the column) is not cracked or worn, and that the pinch bolts are tightened.

Check to make sure the busings that secure the rack to the subframe are not worn out.

Check to make sure that the subframe bolts are all there, that the washers are there, and that the subframe bushings are not worn out (chunks missing and nasty greasy is a bad sign).

Check to make sure the tie rod ends are not worn out.

Check to make sure the lower control arm bushing is not worn out.

Check your front tire pressures.