I've got this too. Have your spouse or a friend move the wheel in the truck from side to side in your driveway. Watch all the ball joints in the steering linkage. In my case I had to replace the steering links on either wheel side and I had to replace the large link between the steering arm and the steering pitman arm coming off the steering gear.
My steering box was also quite loose but after repairing the joints in the linkages it fixed it 3/4.
I did tighten up the box a bit. If your box is loose, you can adjust it slightly but be VERY careful - you can ruin it doing this.
Use a wrench to loosen the nut that holds the allen wrench stud on the top of the steering gear.... while it is slightly loose turn the allen stud inward slightly 1/4 turn at a time. Then re-tighten the nut while holding the stud in place. I was told if you go to far you can ruin the steering gear. Otherwise only option is a new gear box. They seem notoriously loose just so you know. The steering in my 98' F150 was razor sharp compared to this slushbox. Apparently this is a factory adjustment when the box is new.
I'm going to replace my steering gear box next.
2001 F250 4x4 crew lariat 7.3L auto, DP Tuner F5 no-start/valet/20tow/80econo/140aggressive, NAPC 450series trans w/billet triple disc TC, ISSPRO egt/boost/pyro, foil delete, 6" stainless tip, Magnaflow 17979 4" turbo-back, dieselsite boots & coolant filter kit, HX crossover, boost fooler, 6.0L trans cooler, ported turbo housing, DIY 6637 Tymar, billet grill, line-x bedliner, tint, 08' alum diff cover, clear corners & tails, 20w LED taillight bulbs, cheap OPT7 HID kit, 2000w inverter, Tekonsha Primus brake controller, 220A HD alternator, 120w LED light bar up front, 2x18w led spots backup lights, 145USgal tidy tank, etc.
2009 VW Jetta 2.0TDI 6spd Highline full load except nav. 19" Audi RS6 rims. REVO tuned. Aftermarket android 4.2 navi 7" touch head unit, Custom fiberglass box MD Sound 12" & Boss NXD5500 amp. GTI grille and projector fogs.
BioPro190 owner. 20,000L produced 2010-2015.