Tilted bed. I recently picked up a '90 F-150 XLT Lariet 4x4, I like it.

Lots of work goin' on, but, more to do. Slow but steady. I've driven the '90 almost 1200 miles (so far). Lots had to be done 'cause the previous owner passed away in 2007 and the truck hadn't moved till I picked it up.

Lots of the usual stuff has been done. Most were old age; i.e.: rubber bushings, brake lines, clean fuel tanks, oil, coolant, trans (auto), whatever.

Looking at the bed, appears to lean maybe 2" side to side. Passenger side is 'bout 2" higher than the drivers side. The cab itself is fine, horizontal left to right.

Ideas, what to look for, how to fix it?

 

Check the bed mounts

 

if your bed mounts are good, and your frame isn't twisted or tweaked, check you leaf springs.

 

How do you check the bed mounts (geeze I'm dumb)?

Any pic's?

 

walk around on the side of the truck and grab the bottom of the bed in the corners and try to lift it.
there are no bed mounts but it is possible to have crushed one of the support beams, but your bed would have massive damage to the inside from something BIG being dropped into the bed, or the support bar is rusted out.

i'm betting it is your cab mounts. the fronts are worn and the rears are really bad.