[nxtruck]

I can't answer your question concerning the 33-spline stuff, but I can tell you that I'm running a set of Moser 30-spline axles and spool and this stuff has lived in my 4000+ lb. truck for at least 12 years dealing with the kind of power numbers you're looking at ( and then some with the spray). Like Kevin said, though, if you can afford to make the switch, a 9" is an attractive option.