I just got this motor about a month ago and it was shifting fine. I'm putting a new control box on and was testing to see if the throttle was opening all the way. I removed the cable and it sat there for a couple weeks. I'm in Minnesota and the temp. went down to single digits for awhile and that's when I tried shifting it to shift to neutral. I disconnected the shift rod and noticed the top rod does move up and down about a 1/4". I'm thinking it's stuck in the gear box. I drained the fluid which was very thick. I'm going to remove the bottom unit when it gets a little warmer. Is it OK to remove the lower unit while in forward? Thanks, Jerry