I will be that one guy who chimes in with a good luck story on a 4.7.
196,000 and engine has never been opened. Timing chain guides are making noise now but I can turn up the stereo to mask them. Yeah, its going to grind to a halt pretty soon but this Durango has had a sum total of $1200 in repairs, all of it to the front end and transfer case, since it was bought used 11 years ago (12,000 fleet miles in Utah).
YMMV, sum does not include brakes, oil changes, anti freeze flushes, etc.
It gets 15.5MPG everyday. It has been in every state west of the Mississipi.