[Formulajones]

Originally Posted by Jay S

Both.



Stock the 9” were not strong at all. Even the sought after factory 9” N cases did not have enough pinion support, they broke often also. I have broke a stock grey iron 9” case with a inline 6 300 Ford in front of it. It broke the back support off, then split the case open, on top of that it then sheared the posi carrier in two. Kind of eye opening on stock stuff.

Yup, that's exactly what I was talking about. It's a weak spot. Was pretty common to see in the 70's-80's when people were racing with stock 9 inchers they were pulling from junkyards and swapping in their street/strip cars.