vibration could be tires out of ballance. If your pitman arm is loose it probably needs the tie rod ends and drag link checked, or precurser to the death wobble. check youtube their's lot's of videos posted that will help
1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, Yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML War 8K winch, Dick Cepeck Radial F-C 33/12.5/15.