A funny note, the First axel I ever Broke, was a 69 Ford 9" in 75. Blew out the caps with 4.56 gears in a 13 sec 351ci Windsor 69 Mach 1 mustang, when 3 of us took a Joy ride and did a 4000 rpm clutch dump on the street.
Weird. Mine first one went the other way. '65 Cyclone with a 302 and top loader......4.11's Dropped the hammer and as near as I could tell , it hooked and the pinion spit forward , shelling the case , twisting the drive shaft in half and for an instant left me wondering what that horrible sound was. Those were 28 spline stock pieces and they probably twisted some , but never broke. I am not the purist I should be I guess. I am a big 9" Ford fan , and when my 8 3/4 takes a vacation that is what will replace it. But I need to get the car to hook before I have to worry about that.
