When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Check your tie rod ends and your steering shaft for play if you find any anywhere then thats your problem if not maybe your steering box may need some adjustment or replacment.
Have someone turn the wheel while you look over every joint from the column to the wheels. Pay special attention to each of the tie rod ends. Or take it to a shop for an estimate - they will look it over and tell you what it needs...
You have to be very careful adjusting that, if you get it too tight you will blow it very quickly. Check everything else first and make sure it's tight, the steering box adjustment is a last resort. The haynes has a procedure, it involves pulling the pitman arm and using an inch-pound torque wrench to figure out how much resistance there is at the top of the steering column. Don't mess with that adjustment without knowing exactly what you're doing, you'll screw up the box.
Adjusting you steering box isn't rocket science. Just loosen the locknut and turn the screw in with a screwdriver.....and as your GENTLY turning the screw....... have someone wiggle the steering wheel back and forth. When it gets to the point you can no longer GENTLY turn the screw- STOP, and back it up a full turn and tighten the lock nut.
If you overtighten it......... the steering wheel will "not return to center" after making a turn while driving. So DO be carefull when test driving after you make the adjustment.
Follow gatesj's advice and only do this with a inch pound torque wrench and to spec for your truck. On my 99 it is 13 inch pounds over center. Adjusting any other way may work OK but you may be overloading the gearbox bearings and not even know you are doing it. Ask me how I know this?