I have a 45HP. I recently rebuilt the Lower drive. It had been running great, till yesterday while we were out I went to put it in forward it would not engage. reverse is fine. I took covers off and readjusted the linkage and it started to go into forward again. Then it happened a second time. I can feel it engage in reverse, but when I go to nuteral and forward I can not feel it engaging. I can see the shift rod go up and down when I shift from reverse to nuteral to drive. Any help would be appreciated! 