So I've already decided to do a knuckle rebuild and am wondering if I should address a pinion seal leak at the same time. I don't even know where the pinion seal is, I just know my mechanic said it's leaking. I'm thinking if I'm taking everything apart anyway for the knuckle rebuild it shouldn't be that much more effort to replace the pinion seal. Or is it? I started reading some of the threads on pinion seals and it sounds like I have to take the whole drive shaft out to do it. I don't know, is it worth it? I just wish I had a better idea what I was getting into before getting into it!