It is funny how some go rounds for years and some break in the burnout box first time out......
I once saw a Falcon do a burnout and spit the pion and driveshaft from his 9" Ford twenty feet past the starting line. So I suppose all big pion 9" Ford's are junk all so?
I had a 31 spline Ford 9" in my 440 Demon. MILD engine.
I took out 5-6 rear ends before I gave up.
WAR cases, nodular cases, new gears every time, set up buy 4 different guys.
No Ford 9" rears for me.
I know they work for lots of guys. I'll pass though...