Dutchman wants 380 to hot tank, narrow, and install billet ends including shipping. Ford ran 30 or 35 spline in their larger trucks. I am installing the Dana 70 gears in the 60 housing. It only costs 150.00 more and gives a 30% increase in strength. If you want disc brakes, have dutchman install the billet big ford ends and then get a disc brake setup from teraflex, the kit is 189 for the backing plates and you can use explorer or grande cherokee rotors and calipers from a salvage yard. I will have around 1200 in my hybrid axle when done. 3.55 gears and 35 spline power lock. Tim