Wow.. you got 6 years? Thats good.. must be a trailer boat. In any event, I changed gimbal and bellows every 2 years, but I had OMC's and parts got harder and harder to find as they have been out of production for a long time now, so I didnt want to take any chances and transom maint kits are fairly inexpensive. I recommend picking up the alignment bar, and check it every time your drive is off.. I think I found mine on Ebay for like $40 or so.