Had this problem on mine, back in the days when the OEM 'greaseless' joints first came into vogue. Had to replace the tie rod ends, drag link, etc. at about 70K. Ball joints made it to 150K. Made sure that greasable replacements were installed - so far, so good, with no further replacements needed.
Surely things have improved since the 1989 offerings?
1989 F150 XLT standard-cab shortbed 4x4, 5.0L, AOD, 3.55 gears, manual hubs, 31x10.50 tires, 218K miles. Repainted Oct09. SOLD - Jan2015
2014 F150 XLT standard-cab shortbed 4x4, 5.0L, 6-speed auto, 3.55 gears, auto hubs, locking diff, trailer pkg, 5K miles.