8 3/4 Sure grip information

To my knowledge, the only "accurate" way to measure that would be to measure it at the pinion. Measuring at the axle is "going backwards" from how the sure grips are designed. Since they are torque sensing (clutch type more than cone type) they "ramp up" when torque is applied. So measuring at the axle does not include "that". Some will argue that the cone type does not ramp up and is not torque sensing, but it most certainly is to some extent. All you have to do is look at how it's designed. "I guess" you could get a ballpark idea of how good they are at the axle, but I don't see it getting very accurate.