I don't know if this has been mentioned in this thread but realize when you open the circuit to the clutch it is NOT in 100% 2WD mode, there is still plenty of torque going to the front wheels, enough to snap the front drive shaft when on a 2 WD Dyno - been there, done that. That is also a factor why gas mileage does not measurably increase with the current TOD disconnects out there. Good luck and I hope ya'll can make the whole thing work as planned.