yoda 8 inch
They can take so much abuse in stock form it's ridiculous (I've had a 2wd and a 4wd with that axle, 3.91 in the 4wd). Toyota DOES CARE about what they put in their trucks; not their frames or sheet metal though.
I am waiting for the Supra turbo Six Cyl in a dude's 93 4 runner to break his axle though, he's a jackass in that thing.