Well, I pulled the outdrive and then the engine friday morning. after looking and comparing the couplings the old coupling wasn't worn as bad as I thought . The splines on the drive shaft looked like new. I found a couple of engine bellhousing bolts loose and the front mount adjustment nuts had worked loose too! After replacing the coupler I borrowed an alignment tool and realigned everything. It seems to have almost entirely eliminated the vibration. I havent taken it out for a good test but it ran pretty smooth on the hose. It took the better part of Friday but I think it will be worth the time and work!!
