the issue is the chero steers like i have a hinge in the middle of it. i have changed from heim joints in the steering to TRE and check all control arm bolts/tracbar bolts pitman arm nut. i even changed all the leaf spring bushings since they wear worn out anyway. got a little better but still need 2 lanes depending on how bad the road is. cold the steering box be going bad internally and cause that much play. i do ahve a detroit in the rear and i keep the air the same i dont think it in the rear but lockers can do funny things. i have even check the shaft fron the box to the steering wheel. thx