8.25 Strength

I know with a Sure-Grip they will take alot on the street. I beat on mine with a mild 440 and it was fine when I sold the car.

I would be really nervous with either a stick or slicks though.

Coming from the 4x4 world, I would just do the 8.75 or 8.8 etc. swap. I used the 8.25 because it was a great deal and came all set-up. It is a decent rear, but there are better options out there.