The rougness in 4wd could be a result of the slip joint on the front propshaft
rusting itself together, resulting in a non-slip joint. It is common for this
to occur on a 4wd truck that does not have it 4wd used for a few months.
Disconnect your frontprop shaft and see if the slip joint is sliding, also
check the u-joints, they may not have play, but from sitting in one spot for a
while and vibrating they may have brinnelled or pitted.
Brent Cring
91 V-8 4x4
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