My shifter had a massive amount of slack/slop at the column. So much so that it was hard to tell what position it was in. I finally got around to investigating and found the trans "U" bracket and the shifter linkage was terribly worn. The slot on the trans bracket was over 1/8 of an inch wider that it should have been and the round shifter linkage had a corresponding groove in it at least 1/16" deep.
I removed both, welded up the worn areas and filed them back to the original size.
Unbelievable difference. Shifting is tight, clicks perfectly into place, wish I had done this along time ago.
So if you have a sloppy shifter crawl underneath and take a look. Easy fix with a welder, but the fix could be just as easily done with some JB weld, a file and a couple of hours of your time.