As long as you are sure that everything is tight in regards to the u-bolts and suspension, and you are still having problems, then a dropped pitman arm is probably what is needed along with new tie rods on the drag link.
The slack steering that you are feeling is most likely coming from the different angle that the drag link is now at. When the Jeep is stock, the drag link moves more horizontal in motion, and now with the lift, its at much more of an angle.
Most YJ's don't need a dropped pitman arm unless you go to a 4" kit or higher, but all Jeeps are different.
If it did have a rear sway bar on it, (some did, but it was uncommon) and you removed it, then that can be what it was as well. You were used to driving it with everything "tight" and now the back end is loose and makes it steer funny.
Taking the track bars off wouldn't change anything about how it handles or steers, but a sway bar makes a difference.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...