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WOW old school Ground Hawgs and 16.5, you do not see them any more. And I believe they are bias ply too? Like some say for a test drive can you swap on any smaller of a tire? Got a buddy with some 33"s?
Coleen, I know you don't want to think it, but that truck is never going to feel right on pavement with those tires. Dana 44 ball joints and track bar bushings & mounts just can't handle those wide tires. Hell, no stock truck axle can. And "heavy duty" steering stabilizers don't help. All they do is reduce what you feel at the steering wheel, maybe. That's like pouring lidocaine on skin cancer. I've had a few of these trucks, and Jeeps, and have chased this issue in circles. With each vehicle, I ended up changing every wear component before getting it right. I've even machined a few Delrin track bar bushings.
That said, one thing I do a lot to track down front end, and other issues, is to use my phone and go-pro to video. For static video, you'll want to look at several points. I'd start with both ends of the track bar. Set the camera up to video the lower mount, crank the truck, and turn the steering wheel from stop to stop a few times. Look for bushing and mount stud deflection. If those tires haven't wallowed out the stud mount hole on the axle housing, I'll be surprised. There's a tapered stud and reamer fix for this, but it ain't a fun job. Then video the upper track bar bushing. It only takes a small fraction of an inch of track bar deflection, to create a lot of wander and death wobble. I would video the radius arm bushings (front & rear), spring cups, shock mounts, and ball studs on the drag link and tie rod.
Check your ball joints. Start by looking at your front tires. Look for a wavy wear pattern. Jack the truck up, and put a 2x4 or something under each wheel and pry up. If you hear a noise, or feel movement, look at ball joints. This could also indicate hub bearing and spindle problems. Using video here really helps.