My experience with diesel Rams are a little different, as apparently I am much harder on transmissions than most. I lunched 7 NV4500's in a 1999 3500 and 3 G56's in a 2007 3500. My 2004 48RE just exploded after 2000 miles on a rebuild. I have blown up two Cummins engines, a 2004 305 555 and a 2005 325 600, both were injector related and probably my fault for not keeping up maintenance on the injectors. My next truck will be one with an NV5600 or AISIN trans to see how long they last with me driving them. I like the power and less noise of the Common Rail and better brakes/interior comfort of the 2004-2006 Rams, but hated the 2007-2009 interiors. I may go back to the 2001-2002 quad cab because of the interiors and disc brakes, plus the HO engine. I did not like the 2003 compromise interiors between old style and new.