Could be a bad brake caliper. My 96 makes a similar noise sometimes and with the
wheel off you can see the caliper moving.

Not saying you have the same problem but it could be.

Mine started like yours in that it usually took a bumpy road to start it making
that noise. Now it makes the noise more often.

One way to diagnose this is if the noise stops with slight pressure on the brake
pedal.

My first step (once the weather warms up a bit) is going to be to knock all the
rust off of the rotor to see if that helps.

I hope this information helps.

George

Find a place off pavement (gravel, grass whatever), stop and put it in
4WD. Then go slow forward or back with the steering to one side and
then the other. A bad front universal will usually complain quite a
bit, often a snapping sound.

Woody; 95FXDS