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So everything is more or less original then, correct? No mismatch between skeg/gearcase hsg (skeg from a different gearcase)? The prop shaft spins freely in neutral, correct? How about the driveshaft, does it spin freely in neutral? The driveshaft spins hard when only in forward gear? How about if you spin the driveshaft backwards in forward gear (yes, not great for the impeller but am assuming that is coming out again anyway). The prop shaft spins freely in neutral, so that would seem to rule out the rear prop shaft bushing, and the inner bushing on forward gear. You replaced the seals, perhaps it is just a tight fit between the rubber seal lips and the shafts?
Did you try loosening up the impeller housing screws?