I changed tires cause of a bad wobble, problem solved, a month later it came back at 60-80 mph, gettin worse on my 94 ranger
Here's a long answer. It could be 100 things. But if your wobble is showing up at low speeds, look at the tread on the tires. Does it snake back and forth? If so you have a belt separation in the tire. If it's not a tire, you may have a suspension part that's bad. Or, more than one. Control arms, ball joints, tie rods, (inner and outer), bushings, and wheel bearings, and any one of them could be waiting to send you into the ditch, or worse. Many garages will give you a free check of your major components. Try them. If you can't or won't, jack up your truck so one wheel is in the air, grab the front tire with one hand at 9 o'clock and the other at 3 o'clock. Wiggle the tire. A very little play, is probably ok, but if you have more than 1 inch of movement, you probably have a bad wheel bearing or a ball joint or control arm. Now grab the tire from top and bottom. Try to move the tire up or down. You should have NO play, at all. Any movement is bad, probably a ball joint, but it still could be a bearing. When you're driving, if your steering wheel is wobbling side to side, it's a front wheel problem. If you just feel the wobble in your seat, it's a rear wheel problem. Don't let the problem keep getting worse. If you put used tires on, it's probably a tire. That, you can fix. Anything else I've mentioned, you can't fix without some very expensive tools, and an alignment machine. Good luck.