This is a motor I sold to a buddy a few months ago, there were no issues at the time. He calls me yesterday describing this problem of slipping out of gear at around 3/4 throttle or so. I replaced the impeller several months prior to selling and had the boat out almost every weekend, I'm confident the shift rod linkage was hooked up correctly. As for the prop, I was under the impression these old non-splned props were a solid unit with no bushing. After looking at new replacements I see that they have a bushing. Would the original OMC have had it? I have not yet gotten the motor back in my hands but as soon as I do I will check these things first. Just trying to get some info to prepare for worst case scenario. I still have the factory manual for it but am a little intimidated about doing a first time job on someone else's motor. Hopefully it's something simpler. Clutch dog is half the price of new prop but a lot more in depth... go figure.