I remember years ago I had the same truck with the 7.3 only a 1997.
I had a 746 installed in it at one time.
I had noise levels with that motor running that were terrible regardless of what I tried.
I finally traced the problem down to the high voltage injectors they used, and I was told only in that year.
It was a problem the whole time I had the truck. Nothing you could do to silence the problem.
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