The squealing noise is probably one of two things. Either one of the accessory belts is a loose and slipping on the pulley, or the power pump is starting to fail.
If you have a serpentine belt, the slack should be taken up by the idler wheel, if not the you'll have to adjust each accessory belt.
To adjust the idler wheel, you'll see a small hex head bolt which will have a lock nut. There'll be a main pivot bolt that you'll need to loosen a bit. Then you'll loosen lock nut and then tighten the bolt that adjusts the tension until there is about a 1/4 inch play. The tighten the pivot bolt for the tensioner.
For the accessory belts each accessory will have its' own belt. The procedure will be the same for the adjustment bolt, but in some cases you will need a long screwdriver to hold the accessory in place to put tension on the belt and tighten it while holding it.
If the pump is bad, the noise should change when you are turning the steering wheel while your truck is sitting still.
Also check the belts for cracks, damage, etc.
There are tutorials on this site that will walk you through this procedure.
I hope this helps.
Tuesday, February 1st, 2011 AT 5:09 PM