Reply to "Used ZF found"

Garvino, as Mark said- all you'll know after pulling the bottom cover is whether the R & P are unchipped and safety-wired or not. Humans are not strong enough to check R & P wear by hand on an assembled ZF, but any rust showing on gears may mean the bearings will need changing. A little surface rust on gears is unimportant but ANY rust on ball bearings is reason to change them. Three of the 4 bearings potentially involved are std units- not expensive, as are the side seals (likely where the lube drip is) and can be done at home. I suggest you get a ZF Factory manual ASAP (the POCA Store, P.I and most club Chapters stock them) if you haven't already. Working on these units without a manual is like driving fast while blind. Even just removing the bottom cover for inspection, then reassembling can be done wrong in at least 2 ways. I also note that a professionally rebuilt ZF is currently available for $5500.