I dont think I am worried about exploding a locker..maybe a pinion, and why would you EVER want an open diff?
web wheeler
ok, the outer pinion bearing is basically the same as the 4 BUT the inner bearing is enormous compared to the 4 cyl its deeper (thick) and larger in diameter
you can easily put your 4cyl 3rd in the v6 housing
oh, and the rear housing is bigger diamet tube than the early trucks