Checked all four quadrants no movement but took this video. It’s got a bit of a whole to it and you can slightly hear the knock as well at an idle. Like I said it get worse at higher RPMs and when turn to the right while accelerating. 1997 Ford F-350 powerstroke flex plate issue.Ok will do. Thank you.
Oh damn I will definitely check that out first. ThanksWorse at higher rpm and worse with right turn could be your down pipe knocking on the under side of the cab. Happened to me after installation of a 3” down pipe. Worth a look if that sounds like your situation. Fixed it with a big ol’ pry bar.