A month ago or so while towing grandkids around for an hour or so I noticed a slight change in vibration/ noise while in gear up at 2500 + rpms, this along with an oil in bilge issue, which I did solve( seperate thread ) has kept our boat close to our marina. Before I haul her out, I ran in neutral at various rpms, turning wheel lock to lock, definitely a jumping, bumping Marraca sound when at rpms above 1k , progressively worsening through 3k rpm while in a full port or starboard steering position. Almost zero rumble or vibration at idle or below 1k rpm. This was all in nuters, Local marina mechanic says gimble bearing for Sure...so I haul her out, our vacation trip is up coming. We managed a week's trip to the BC coast but we didn't haul our boat down to coast. We stayed aboard my father's 58ft Navigator in the beautiful Desolation Sound area. You know the kind of trip, days of 100 prawn sets, 12 Dungeness crab in each trap, oh did I mention buckets of fresh oysters picked off the shore, a few ling cod, saw some sea otters..gotta love it...bit of Coastal heaven. Once home after work days I have been figuring out how I can solve the rumble/ vibration noticed previously. Going to teach myself how to Replace the gimble bearing, mechanics I talk with, ( I am a DYS kinda guy) they suggest checking the upper and lower leg while I'm out too..so I do. I had taken boat out of her slip and put onto trailer while away on the west coast trip so I pulled props to check output prop shafts. Notice Quite a bit of chatter when spinning prop shafts by hand, so I dropped an ounce of gear oil, found metal fillings. Drained entire leg gear oil...definitely metal..drain magnet was covered as was a separate magnet I dropped into the oil bucket... next step..curse..next step.... get quote on outdrive from mechanic merc dealer, lower unit $6700.00, complete unit $10890.00 plus taxes and 100 to 400 in misc parts depending on how my bellows, shift boot, shift cable etc then labour.. 2- 3 hrs estimated ... no one rebuilds they say.. it's a 17 yr old drive they say....next step.. curse some more.. Then I start looking for reman unit in same drive ratio that is in 150 km radius from home so I can go pick it up. Finally a bit of luck, 100 Kim away, freshly rebuilt, complete upper and lower unit done with OEM parts in the correct gear ratio, with a 10 month warranty. They will give me 1k off for my old core..so $4500 vs $10890 Local shop mechanic is going to arms length assist me and lend me the specialty tools I will need to do it right....by Sept 10th if all goes as planned I should be ready to relaunch her and get a month or so of boating enjoyment in...will keep you posted..wish me luck.