I just picked up the 4.6 today from the dealer and they found no faults or anything wrong with my trans. The tech and my service guy both test drove it and said it drove fine. I asked about the software update and the Dinan tune and got a blank stare from my service guy... The parts dept has Dinan stuff posted on the walls so I assume they can do it.
They didn't charge me for this at least since I just spent 2600 bucks on my cooling system. On my drive back to work it seemed to drive normally with no hesitation. Maybe I just need to change my driving habits and be a bit more agressive
.