why a Ford 9"?

A few years ago I read an article in one of the camaro lover's mag. on the strenth of the factory rear diffs. as I remember the dana 60 was rated the highest( a couple of hundred h.p. over the rest). The part that shocked me the most was the 83/4 and the chevy 12 bolt were rated for 500+ h.p. stock, the 9 inch ford was rated for up to 400h.p. stock. Out of all the rear axles the 9 inch is by far the easyes to set up and very strong when put to gether with expensive after market parts. what I have seen at the track is when they fail the cause is usualy the pinion support blowing out the front of the case(witch I am told is thing that makes them stronger). The 8 3/4 has 30 spline axles and the magority of 9's have 28 spline only the heavy duty axles had 31, traction loc diff. is famous for its one legged burn outs, so a locker is the way to go(more money). Dana 60 came in all 3/4 and 1 ton Dodge trucks up to around 2001.