Honestly if anybody really wantedf to "Nit Pick" on a true OEM drivetrain, there would be alot of trucks that could not run and the WS, 2.6, and 2.8 would be so limited to power that the 3 classes would probably be more of a joke than anything. Honestly if this were the case, how many factory oem drive trains come with dual and triple disk clutches, or bigger input and output shafts, 1480 u-joints and yolks, added clutches and moddified valve bodies, 5 disk Tq Converters.
Really I don't see anything wrong with running a setup like this at all. If you think about it, when you lock up a Tq Conv. on an auto truck, your basically doing the same thing as the danco clutch setup is, only real difference is you basically have an unlimited stall speed and can engage the lock up at any RPM and when you exactly want to.