Ok, I thought I had heard a while back that maybe Randy's ring and pinion or somebody was going to start making gears, there used to be no options besides factory. For our application it should work fine, still a nice upgrade from the 8.25 I think. I am used to thinking in terms of musclecars, back when I last got to mess with mine nobody wanted the 741 case, no aftermarket gears, weaker, but I am getting to be a dinosaur. The lockers and stuff swap pretty much straight across the board on all three, so you are all set there.
I was laughing pretty hard reading about the guys looking for the dana 60 from a E or B body mopar in the junkyard, they have probably been largely picked over, mainly hemi and six pack 4 spd cars, worth their weight in gold to the restoration guys. I know of several 8.75 rears being used in 10 second bracket cars, I doubt one could ever be broken behind a 4.0, even with the small pinion. I think you will be fine.
The rear drums you got with it should be nice too. Might have to play with the wheel cylinder size for proportioning. If you want to look around, a lot of C body (New Yorker etc) and late B body cars (think Cordoba) used the 11 finned rear drums, usually on a 9.25 rear but they fit. Some of the backing plates have a slightly different offset. I used Cordoba stuff on mine. If I remember right the bolt pattern on the backing plate is the same as the 8.25, so the grind a little on the backing plate and use d35 rear discs trick may work, I want to look into that when I get my 8.75 up here.
Good Luck!
