I have replaced seals and bearings on this 1965 60hp Johnson and I could push or pull the shift rod and it would shift into and out of forward,netur and reverse. After I put it back together I could not get it to shift into forward. It would go into reverse and netural. I could get it to start into forward by useing a screwdriver in the junction port on the side and putting pressure on the shift rod. As soon as I release the pressure it goes into neutral. In checking shift problems on a 40hp Johnson the indication was a worn shift dog and possibly a forward gear. When I disassemble the prop shaft assembly what do I look for to confirm wear? Is this most likley the problem? What else should I look for?