Telling the diff

StrokerScamp said

The phord nine inch has a pinion "plate" on the front of the center section just behind the yoke with five retaining bolts. The 8.750 does not.

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Not always. I got a 9" center section that came from a Truck and it didn't have it. When I was put the 9" back together in my Ranchero, I took the pinion plate onto the truck one becaue it was a limited slip unit.