Inspections of Worn Parts
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Prechecks for your alignment.
Inspect the pivot point on the Independent front suspension ( IFS ) for play or worn parts.
Inspect the brackets and bolts above the pivot point on the Independent front suspension ( IFS ) for play or worn parts.
Inspect for worn parts or play, any of the following:
Inspect the tie rod ends.
Check radius arm bushings for wear or crack.
Check gear coupling assembly (aka rag joint) on the steering column rod for play.
Check the shaft and joint assembly on the steering column rod for play.
Check for play the drag link.
Inspect the front wheel. (the front wheel bearings for play)
Inspect the ball joint for wear.
Verify correct tension on power steering belt. (tighten belt if neccessary).
Let us know what you found?

I found on a 1991 4x4 F150 the bracket bolt above the pivot point (IFS) (located in the center of the crossmember) to be worn on this particular truck I worked on. Inspect all bushing and bolts at this particular area. It had also caused the suspension system to sag.

-Buck-
1975 Ford F150, 4x4, 390cid, 4 speed
1975 Ford F250, 4x4, 400cid, 4 speed
1976 Ford F150, 4x4, 360cid, 4 speed
1978 Ford F150, 4x2, 302cid, 5 speed