Dave I used Spicer ball joints when I redid the ones on my '98 2wd at about 180,000 miles, they seemed very good quality. I had one definitely getting worn and did them all at the same time. While working over the front end don't forget about the front wheel bearings since they're the old style clean and repack variety until the 2000 model.
'98.5 Club Cab 2wd SWB, Garrett BB Stage 3 turbo, Polydyn tubular header, Jammer I injectors, 5" exhaust
Truck 2: '96 CC 4x4 LB, 5-spd 3.54 LSD, PDR 175 pump, Hybrid 35/40, DDP Stage IIs, SB 13" Clutch 472,344 mi.
In memory of Rob Hanson- July 2005
and Nowel "HVAC" Thomas- Dec 2003