I don't plan on drag racing or running sticky tires so that should help things a bit. The 8-3/4 has a low mile TrueTrac I stuck in it and it runs the big U joints. Still, there's a double cardan joint in the drive shaft so I've got three joints to break.
This dinosaur won't be taking down C7s but it'll likely frighten a Mustang or two. It tipped the scales at 5300 lbs with half a tank of gas and an empty truck. All I can compare it to is the Mercedes S65. Those things are slightly lighter, have 704 lb/ft and 630 hp. They run bottom 12s with the 5 speed auto.