DO I HAVE TO CHANGE TRANSMISSIONS TO SWAP FROM 4.7 TO 5.9

You will need pretty much everything. You will need the engine, a 46RE transmission, engine wiring harness and computer from a Durango the same year that had a 5.9 (plus the SKIM module and ignition key if it has SKIM) You will also need alot of other small parts people don't think about like a shift cable, belts and hoses, a/c lines, exhaust, etc. Unless you are really attached to this Durango for some reason, cheaper to sell yours and buy one with a 5.9, they are easy to find. I did a 4.7 to 5.9 swap in my 2002 Ram pickup about a year ago--it is possible, but you really need a complete donor vehicle that has the parts you need.