Wait a second....The factory warranty is fully transferrable and nothing is needed to be done, at least was needed to be done to any car I've ever bought under factory warranty....Yes, extended warranties may not even BE transferred it depends on the warranty I guess.
Regardless, dude with the moose knuckle...TAKE IT IN! There's no way to be sure but I'm guessing you should be fine. The steering knuckle is a big chunk of steel, I don't see how it could just fail.
Why the heck didn't he get it taken care of before he sold it to you?
