I had the identical problem a few weeks ago. I would have bet the ranch that it was one of the folding prop blades not opening. (Martec 2 blade folder) It only happened in forward gear. I purchased a new Flexofold geared folding 2 blade prop but the problem was still there. As it turned out, it was the clutch cones in the transmission. I had Mack Boring do the rebuild. It took them two weeks to do a standard rebuild which also included new bearings and seals. Price of rebuild was $1100 and my labor. I suggest that if you have the transmission out, you should also change the damper plate. It's a pretty easy job if you have good access to the back of your engine and none of the bolts are seized.
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