uhh... is my 904 "chirping" under hard upshifts???

Lelo Dart said
Yes built by a reputable local guru. I was told it was nothing to worry about but I don't like it. Might recheck adjustment on bands. Swapped from a built 318 to a mild 5.9 magnum.

It sounds like we're in exactly the same boat here. former 318, now with a Magnum 5.9L.
Yours is also a 904, not a 727, correct?