Ok here goes, 1986 F150, 4X4, twin shock front end. Ball joints are nice and tight, wheelbearings were done ~6 months ago. Bushings seem tight as well. radius rod bushings are 5 years old and look great still. Outer tie rods are good as well as the center/drag/inner tie rod whatever you want to call it. It's had a little bit of a rightward pull just right of center for about a year now(less than 1500 miles; truck sits a lot), even after getting it aligned. It was enough to make you pull left a hare to get it straight. Recently it got worse, it almost feels like one of the wheels is flopping over when you go right of center, and you have to make a bit more of a drastic left to get things back in line. It does it on crowned roads and flat roads. It is more noticeable at slower city-type speeds. Highway nowere near as bad. It was also more noticable towing my 22' TT with the WD hitch putting weight on the front. The only thing I can see is a slight but noticable side to side shift in the pitman shaft while going over center with the tires on the ground. The steering box was replaced with a reman somewhere between 8-10 years ago. It is not leaking surprisingly, though the pump is. Fluid levels are good. I went has far as taking the belts off and taking it around the block and it still did it so it's not a surge from the pump. I have attached a scan of the sheet from the shop when it was aligned last May, again under 1500 miles ago. I have a new steering box, pump and lines in the waiting but the more I thought about it the more it bugs me that it's so small a shift on the pitman shaft and it's not leaking, and otherwise feels tight. No more play than any other Ford I have driven over the years. Tires arent even wearing funny at all. Tires are Load Range C Kumho A/T's

Any thoughts or more info needed?

Thanks and cheers