ive never worked on 4x4's before, but in the middle of tearing apart my friends 89 Raider 3.0L. Putting on new front brakes. Have taken everything off, and i know i have to re-pack the wheel bearings etc. My question is...the outter auto hub...how do you know if its worn out or how do you service it? The manuals don't mention anything...looks like there is a bearing in there...do i just try and cram as much grease in there as possible...the back side seems to half come off but i can't take it apart, any advice?