I still run the 742 8-3/4” that came with my car from the factory. After breaking a couple of sure-grip differentials, I now run a spool, along with a steel cap on the driver side, 35-spline axles, and my housing has a brace stitched onto it. My car doesn’t make power like most on this board, but I do throw more weight at mine than most, as my car crosses the scales at a solid 3870 these days. It 60’s in 1.53,the footbraking.

I know a guy here locally that runs a low10-second 67 GTX on a trans brake. He still runs an 8-3/4”. My belief is that 8-3/4’s have their place. A 9-second B-body may not be that place.

For all those that call the modifications “band-aids”; the 9” units that most run are not stock Ford units, they’re full of aftermarket stuff also. For that matter, most Dana’s in this conversations are likely S60’s outfitted with Spools, aluminum covers, and aftermarket axles.