Fords with TTB suspension are known for their somewhat vague steering feel. On off-camber or less than ideal driving surfaces, continuous corrective steering input is required to keep the vehicle pointed straight. When the vehicle is raised, these inherent tendencies are magnified. To correct this concern, you must: (1) minimize tie rod angles, and (2) improve steering tie rod-to-axle beam "phasing"... the tie rods' arc of movement should better match the axle beams' arc of movement.