way long ago in a land before time---SAE engineers rated the 8.75 good at 500 hp and the 9 inch at 450 hp----9 inch flaw-----the pinion is located at the bottom of the ring gear---that is the weakest position----it is strongest at the middle of the ring gear-------yes you can buy alot of stuff for a 9 inch because the aftermarket chased it-----like they chased the sbc....
