I just had the steering box replaced on my 08 f350 4x2 drw at 45000miles due to wander. this was a used truck purchase, and the box replace was to fix the wander felt pre-purchase.

now at 49000 miles its back. 1/2 of the 4500miles has been towing a 7000 trailer, bumper pull.

I replaced the shocks and the steering damper too. no help.
there is also a slight shimmy/tire bounce feel at 70-72mph. feels like road induced, front tires spin balanced, not road force. not all the time,

currently the front tires are at 65psi (recommended pressure), while the rears are at 45 (recommended at 60 when loaded). truck weighs around 7000lb, has 13000lb GVWR.

I wonder if the box needs adjusting already? its a ford part, installed my the chysler user car dealer, and checked by the ford dealer. alignment also done by the ford dealer.

any ideas welcome.. remember this is a 4x2, not lifted, no front hubs, ...etc

Sam