I have a 68 Johnson 9.5 on my little duck boat and the very bottom piece of the lower unit cracked during the summer when I was out just running it and hit a rock so it drained all of the oil out. I have a 64 that's a parts motor so I took the bottom piece off of the lower unit of it and it looked a little different but everything lined up so I didn't think anything of it. Well fast forward and now the motor doesn't want to stay in forward or reverse. Reverse at all and forward if I give it more than idle throttle. Is there a different where the little arm connects down on that bottom section to change gears or is this a different problem? Thanks in advance for any help