Who cares if the welds aren't perfect. No hate here.
Those look just like the set I got off eBay to put 351W/4R70W into my '73 F100. I bolted them to the engine on the stand and saw that they were probably going to interfere with the transmission. (I don't have the transmission to bolt up yet.)...
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.
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