Concur with Alan. First thing to verify is that it is the cable and not the tranny itself. Dont know how old your boat is but if its a Morris shifter, you can get a replacement cable from WM or similar chandlery. Disconnect and snake it down to remove it. Might be a good idea to attach a messenger line for any places you cant get too. Then measure what you removed. Make sure you get tranny and not throttle cable. They, as I "remember" have different attachments although dont quote me on that. Its work but shoudnt be too bad.