There is bit weird behavior if you add AWD transfercase, but if you have only rear diff. First when you select AWD transfercase, dummyshaft gets RPM, but after resetting car dummy shaft gets 0 rpm until you replace part again. Also vehicle performance is affected, I'm not sure if 0rpm or if dummy shaft should get some proper rpm, but I would think situation should be consistently one or another. Video shows first RWD transfer case selected and crash, then reset of vehicle and another crash, after that selection of AWD transfer case and no front diff, dummy shaft rpm is visible, crash and finally reset and now dummy shaft rpm is 0, then final crash: Obviously without front diff, there is one shaft spinning freely and only part of the power is transferred to wheels, but which of two cases is correct, dummy shaft with rpm or dummy shaft with 0rpm, or should it be random? Question that bothers me is why only once after part is selected there is rpm for dummy shaft and why not after reset? It can be of course by design, but also there can be something that needs checking, so I thought to bring this up.