Originally Posted by Emilio
Ok when top cable off shifts good but when bottom cable off top on wont shift
If I recall the top cable is the one going to the helm control therefore if it shifts ok when disconnected but not when connected and the lower cable is disconnected then the cable not adjusted properly. Go to Documents of this site to get the Mercruiser manual for your drive and follow the instructions on how to adjust the cables. Note there is a tool for this.
Also with the lower disconnected and the engine running by pushing and pulling on the cables end the drive should shift into forward and reverse.