Hi, if I understand it correctly you went from a G56 to an NV4500. I want to do the same. I'm so tired of spending a fortune every time it breaks. I'm looking to put it in a 2009 25004WD with the 6.7 Cummins. Can you please tell me everything you had to do to make it work? My email is farrerandawayventures@gmail.com or call me if you want at 616-255-2355. I'm Shayne. Thanks for any help you can give me.