Hi I have a a complete 2007 Chrysler Pacifica donor car and I want to know how much work, or if it can even be done, to swap 4.0 and 6-speed transmission out of the 2007 and put it in a 2004 Pacifica. Has anybody done this. I'm a well-seasoned mechanic and not afraid to modify if I have to. I'm just wanting to know ,if it can be done ,what I am basically looking at. All help would be appreciated. Thank you