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....
I'm at work at the moment and don't have time to find a link to the info to back me up, but......(Someone please correct me if I'm wrong.)..... I have to disagree. The closer to center a pinion is, the more
efficient it is. But that location creates less tooth contact area which can hurt load capacity. The low mounted pinions spread the load out over more teeth, making it more durable as far as the teeth are concerned, but at a loss of efficiency due to more friction (plus the added bearing in a Ford 9").
