I was gonna stay out of this but got to throw in that the "small pinion" 8.75 is NOT weak like the ford 9 inch that came behind a lot of weak junk ford engines witch most were. Never hear of guys breaking the pinion just the caps mostly but all 3 main mopar diffs are very strong un-like the ford. The good factory ford 9 inch is rare. A 318 2bbl b body came with a good 8.75 unlike a 302 2bbl ford. And mopar did put more 8.75 behind hemis then dana, mostly just manual cars.