So, the new 6.4s with 8 speed are very nice and taking nothing away from them, but you’d be trading down, considerably.
You spend too much time reading about the problems. Just use the diesel and odds are you won’t have issues or major issues for a long time.
However if the reading is getting the best of ya or keeping you up at night, call motorops.ca, get a tuner and exhaust and delete that sucker and sleep well!
For a couple grand you can make all that stuff disappear off the truck and probably recoup most of your money selling it to someone who does have problems.
JMO
On the upside, if you got a decent deal on the 2018, you’d make out very well selling it currently, but don’t expect any big favors on the price of a new rig.