Re: 7.4 volvo penta I/O vibration help!
OH! one more thing anything else i should replace while I am ion there?
Well, you wont know until you're in there...
If it's making quite a ruckus then you will most likely need new u-joints and a gimbal bearing. The gimbal bearing is easy to R&R if you have the appropriate puller. The u-joints can be replaced just like vehicle drive shaft u-joint yet if they are bad enough and the shaft is all rusted you may consider just replacing the shaft/u-joints all together.
If you have never or don't know if the bellows were ever replaced do that now as well. Most likely a cracked/leaking bellow is what caused the rest to go bad. You may have two bellows, one for the shaft and one for the exhaust. Some however (like my DP), only have the one for the shaft/u-joints. A single kit will cost you about $85, both will be near $150. Both are easy to replace with the drive off - and you don't need to remove the pivot housing either.
Thus - start with:
Bellows kit
U-joints and gimbal bearing
2 O-rings for the drive shaft
O-ring for the water passage between drive and pivot housing
Cheers