I can remember when the Chrisman brothers had Jim Dunn and Joe Reath do the initial 9.0 inch rear end R&D on their old rear engine funny car back in the late 1970 and early 1980s, some one at Petersen publishing group heard about that and thought they would make news out of that effort hence all the chatter about the magical Ford nine inch rea end
I look at the 8.0% larger ring gear diameter and the larger tooth to pinion teeth contact as well as the reduce drag on the Dana 60 as well as the 40 spline axles
and lesser costs as my reasons to continue use them
I'm old school I am and I'm not looking to waste my race car budget either A stock dana 60 housing with 3.0, 3 1/8 or the larger H.D. 3.250 diameter axles will take a lot more power than any stock Ford nine housing will take Why spend a $1000.00+ for a good after market 9 inch housing when a stock junk yard Dana 60 will live for you
Dana 60 live long and go faster