Well I can tell you the welding held up till my last job when I got on clear pavement in 4 wd and got a few to many rotations in that b$#@&,  jammed up couldn't get it out of 4 wd, dumped the clutch and jerked it hard to at the next job look down and see the rear not always spinning when influenced with a punch of the throttle. Well got 53 miles out of her and 12 hours of clearing parking lots, and driveways. No adverse sounds coming out of (trucks) ass end yet.
Fronts 4.11 Backs  3.55 im guessing