Cab and rad support mounts? Really? Back when i worked at the dealer we were putting rads in 6.4 trucks when they were a year old. Say what you will but changing cab mounts is a waste of time and money. There is no way that they are worn and 2 the whole complete truck will flex more than what those mounts will give. Guess the 6.7 trucks are all gonna need cab mounts too? Replaced countless primary radiators in them too. If anything the rads are mounted too rigid and aren't allowed to flex enough.
I'm not saying I know the answer, but thermostats will cause all kinds of problems with these trucks from coolant leaks, oil cooler problems, cavitation problems, egr problems if you still have an egr valve. As much as a nightmare the cooling system seams on the 6.4, you would think they figured it out for the 6.7. Guess again. once these trucks get a little bit older they will be a nightmare. That orange coolant is a son of a bi*** to trace coolant leaks.