I've been trying to figure out why D-50's are so bad. Did a search and from what I can tell, the only diference from a 60 is a little bit smaller carrier and ring gear and 30 spline axles. The carrier is bigger than a 44 and the axle joints are the same as a 60. I've seen a lot of 44 axles broken at the joint and not many broken at the splines so wouldn't this be a decent upgrade from a 44 or is there something I'm missing? Are they not any less expensive or more available than a 60, or is there a weak link other than the spline count that I haven't heard about? I've heard about gears as low as 4.56 and ARB makes an air locker for them. The ones I've seen have ball joints instead of king pins, but I thought the late model 60's did too. Seems like they would be more popular than they are. Can anyone clear this up for me?