Here's the 7.5"
Randy's Ring & Pinion says it was used only in the rear of Blazers, Camaros, vans and some other stuff.
Assuming it's a 10 bolt front, they aren't real strong, but a lightweight rig should do okay. Fullsize guys aren't hot for em with 5000+ lb trucks on 35"+ tires.
And another Randy's quote says, "Spline Count: 1.625 / 30"
And gearing of:
2.56
3.08
3.23
3.42
3.73
4.11
4.56
4.88
5.13
5.38
5.57
A 44 would be a better option if you could find one.