Looks like the guy has a lot of interest in this product,as i have used one for over 50,000 miles now i will address some of the above concerns. The bearings or bushings in the steering box probably will never have to be replaced as most of the side to side thrust is now taken by the new bearing. There is a posability that this bearing might have to replaced in the life of the truck and if so $5 to $10 bucks and ten mins. work. The new threaded nut and the shaft the bearing is mounted on is a one piece machined unit,if tightened to 185ft pounds like the org. there is no posable way it can come loose. I guess if one is concerned about this one could put a drop of loc-tite on,i didnt and no problems. If for some unknowen reason the bearing did sieze the bearing will turn in the self alining cast holder. The bearing has a grease nipple on it and i give mine a shot of grease every oil change. As for helping the track bar situation i really dont know,i am thinking that taking all the play out of the steering so the truck dont move side to side maybe,just maybe there wouldnt be so much stress on the track bar but again this i dont know,just hoping it helps. Going to put one on my 2001. 5 to prevent any and all wear in the steering box,not worried about warranty as this unit doesnt change anything except make it stronger and safer. Dealer says its alright with him, should have been done way back in 94. Furthermore if something did go wrong in the power steering and one has a finnicky dealer just remove the unit and put the org. nut back on. Havent looked at the 2003s,wonder if they changed anything in the steering?