Re: 98 4x4 Driveline problems
I had the same thing on both my Rangers, a 99 and an 02. The fix was a new aluminum driveshaft from Ford. I was on warranty both times, you're not, but either get one or look around junkyards or eBay for an aluminum driveshaft. Also if the front yoke gets dried out that can bind. Pull the shaft, spray the yoke out good with brake cleaner, re-lube it with synthetic grease, and put it back and see how it is.
'05 Sport Trac 4x4, L/S, torsion lift, extended shackles, 265's
'03 Taurus wagon, Silverstars, Yoko TRZ's
If you give a man a fish, he'll eat for a day. If you teach a man to fish, he'll sit in a boat and drink beer all day.