converting an 8 3/4 to the correct sure-grip

"When it's rebuilt, just swap out the center sections, which should take just a couple hours and you're done. Then you still have an extra case to rebuild to something different should you decide to upgrade from highway gears to something more steep. "

That is the beauty of an 8 3/4. I have 4 or 5 centers with different gears. Going on a trip, put in the 2.76's. Rematch with a 327 nova, put in the 4.56's. Normal(?) diving, run the 3.55's