So I'm looking around at used axle housings for a 9" floater, my question is, having never worked on one of these, how do I calculate what the trackwidth is going to be based on the width of the housing? Thanks! Oops, before I go, what is general concensus regarding a centered or offset pinion? Looks to me like most of the fabricated housings have the third member centered (offset pinion?)...is this correct?