I have a 1974 OMC sterndrive. The engine is the 165hp inline 6 cylinder, and runs great. The boat is equiped with electric shift which worked fine until the last time I took it out. THe boat was in forward and after about a half hour it started to slip in and out of gear. Eventually it would not go into forward at all, but reverse works normally. I am confident that the problem is electrical and contained to the outdrive. Does anyone have experience replacing the gear/electromagnet assembly in the lower gearcase? Does the entire sterndrive need to be disassembled in order to do so? What would a reasonable price be to have this work done proffesionally? Thanks for the help.