Re: Greasing the lower unit....
Do you know the history of the boat, when was the last time the drive was off and the u-joints greased? If you don't know then it would be good to take it off, check the gimbal bearing, grease the u-joints, check the shift, drive and exhaust bellows for cracks and either fix them or have them fixed if there are problems. At least then you know where you stand.