I always loved the 8.75 for the gear swap bit. I've swapped gears once each time I've owned one. I've also damaged one. Personally now I like the dana. And they are far cheaper.
you want a gear change for the strip? Buy a GVOD or an OD transmission. I can run my 4.56's down the interstate to the strip and then blast through the traps at an ideal Rpm.