HAS A BAD WOBBLE IN REAR. HAD KNOT IN ONE TIRE. HAD TWO USED TIRES MOUNTED & BALANCED, PUT THEM ON & PROBLEM REMAINED, MAYBE A LITTLE WORSE NOW

could be bent axle but I would lean toward a bad tire. jack rear of vehicle qnd rotate tire slowly , if bearing is bad you will feel it. hold top and bottom of tire and rock, if bearing is bad you will have play or movement. rotate tire slowly and observe where is wobble is.

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.

This could be your wheel bearing,raise front end on bad tire side and grab tire and move it around to see if it is loose,http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0900c15280265793&partName=Front+Wheel+Bearings&partId=0900c15280265793

sound like you have tire out of balance or possibley a bent rim. i would jack the passenger side up grabbed the tire and see if it wobbles, if not then you have something wrong with the tire i would also turn the tire and look to see if you see any metal on the inside of the tire and feel for large knots. these factors will make the vehicle ride really rough let me know how this works out for you..

You probably need to get the tires balanced. One of the balancing weights may have come off.
Make sure the lugnuts are tight.

WOBBLING TIRE IS A BAD WHEEL HUB BEARING.REMOVE WHEEL CHECK HUB BEARING WHERE FRONT AXLE MESH INSIDE HUB.SHAKE HUB BEARING SEE IF IT REAL LOOSE AND WOBBLY. IF YES HUB BEARING BAD.

could still be axle i have been fooled i would check tires though maybe have them balanced check for bulges or wires showing through maybe move front tires to back and see if wobble moves bad engine/ trans mount could do the same hold brake with engine in gear and tap gas if you have a bad mount the engine will want to roll over

You probably have a loose front end part.And could have a tire out of balance.

put the front tires on the back and see if it changes.
alot of times,if the suspension is defective it wears the tires uneven ,out of round.
check and make sure the wheel nuts are tight and torqued properly.
alot of techs use just the gun,and not a torque stick and overtighten the wheel nuts.

i would have the shock/spring checked out as I'm sure that's whacked. and potentially the wheel bearing causing the wobble. the rim / tire may also have damage causing a wobble. the wobble could also be caused by a simple wheel balance weight having been knocked off from the accident...have the tire balanced at a shop....2nd jack up the side. swap the front wheel and put it in the rear and spin it...this will tell you if there is more structural damage to the rear suspension. being the above listed. As far as the ball joints, usually they will be fine or snap.