I have not. Im assuming that is pretty easy to do? I am going to try the adjustment tool first, but if that does not work I will pull the back cap.

I would pull the cap first, if it was shifting fine and then not, it's more than an adjustment issue.

Don't forget the ball bearing detent in back cover. They can jam up. There is an inner spring inside the bearing sleeve and a smaller spring that seats in the rear cover. The ball bearing should push in with your finger while in the sleeve then then the whole sleeve moves in and out via the smaller spring

If it shifts easy into forward, and has resistance into neutral & reverse you have internal drive problems, I recently repaired a Bravo1 w/same problem, the Brass ring came off the reverse gear , it was easy to see w/ the rear cap off.
Please let us know what you find.

Shift cable could be broken at the helm or came loose and popped out of shift lever. I had one that broke.

I'll be pulling the rear cap tomorrow before I winterize the boat. I'm hoping I can figure out what is wrong before I put it away for the winter.. it almost has to be in the back cap.. I just want to clarify with you that the shifter goes into forward easy and has resistance going into nutral and reverse, but the drive doesn't go in gear. However when we pulled the drive we were able to put the drive in gear with moving the shift cable clam shell holder while turning the input shaft no problem.

What all should I look for in the drive when I pull the cap off, I know one other person said the detent ball and spring, I have looked at some videos of people taking the caps off and it doesn't look like there is all that much in there.

Thanks to everyone that has replied, you are all very helpful.

Not much in there. Mine went into reverse and wouldn't come back until I removed the cover. I ended up shortening the small spring slightly and buying a new shift linkage. I put the old up to the new one. The new one was shorter by about. 030 to. 060. Meaning the new shift linkage does not depress the detent ball by as much. I also carefully filed a radius on the edges that ball rides on. It shifts fine now. My other drive shifts hard also, I will be doing that one also once I take it off. Here is a pic of the linkage yes it's over priced.https://goo.gl/photos/e43zcKuxrzQKPzPg9

Well I took the cap off yesterday. Detent ball was fine, shift linkage seemed alright also. I think it has something to do with either the "shift fork" ( not sure if that's what it is called) or something with the clutch/gear assembly. Once we finish selling our house and moving ill have more downtime this winter to pull the drive and send it some where or take it apart if I feel I can do that myself.

Mine shifted fine when I turned the shaft and actuated the shifter by hand but not when it was mounted with cover on. Put in gear. Reverse and forward try turning prop shaft should not slip in either gear. Did you check to make sure the small detent spring is not broken, could be binding up. Upper and lower gears oscillate up and down to help pop in and out of gear that's why you need the alignment marks opposite + on top - on bottom or vise versa. You can see the taper on the brass rings upper and lower. When gears are spinning you will see shift fork moving up and down. Might be qproblem there. Good luck I wrestled with mine till I got it right. Don't force shifter you will break something.

Thanks. Once I finally figure out what is wrong I will make sure to respond with detail on what it actually was to hopefully save some other people some trouble. Right now it doesn't sound like it will be this year. but possibly early next year.