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No, don't shave the joint unless you want to risk creating more issues. He's saying the mounts because they have rubber cores that break down over time and cause the engine to sag, which is probably creating your issue
Eventually it might wear a hole in the header eventually I have shorty tuned headers on my 95 5.0 and have no issues at all I have all new motor mounts and rebuilt motor in my car though. Mounts might fix it. Don't shave the u joint bc of that fails your screwed. I would see about the mounts first.
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