The gears in a Bravo are in constant mesh, so any grinding sounds are to be looked into. Are sure it was a grinding sound or a chattering sound? I have heard chattering when the cone is trying to grab the cup from being out of adjustment keeping slight studdery gear contact. The gear contact was not enough to move the boat in neutral, go over your drive cable. First disconnect the cable from the converter run the boat on the hose, shift the drive by hand it will have some drag but should not be to bad. Mark full throw forward and reverse then center for neutral it must be mid way. Now look where it attaches to the converter, does it line up perfectly? If I am right good chance the adjustment will clear up the issue, if not it may be cable time.
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.