Got an old '72 F-250 4x4 that had a sloppy front end. I took it to a buddy's shop and he put new bearings and seals in it.....it did this within 2 miles of leaving his shop. I took it back home, cut brass bushings to replace the bearings, and never had another problem. I told you all of that so I cantell you this: It doesn't take much slop to cause death wobble.