Cut the ground wires for the bulbs at the back of the truck. Clean a spot on the frame and bolt the wire from the bulb to the frame. I have seen this fix so many taillights and reverse lights over the years on older vehicles.
Or take take it off and inspect the rubber. If the rubber is not cracked, and there is no vibration then it probably is not the harmonic balancer causing the issue.
I have never had a 4.0 but every motor I have owned has a rubber lining inside that can rot away and cause noise before failure. If you know for a fact that it is the harmonic balancer making the noise I would plan on replacing it sooner rather than later.
I put 8" wide rims and 255/60R15's on my '93 2.3L that came with 225/70R14's. I also swapped out the 3.45 gears for 3.73's. I love 'em, grips the road like nobody's business. Took a pretty good hit to MPG's, though.
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