Just test drove all three. Had a 97 f 350 best truck I ever owned. The 6.0 turned me into a GMC man in 06 356,000 and it is now the best truck I have ever owned had a 2016 d350 6.7 is not a 350,000 mile engine the auto is far inferior to the Allison. Still have the GMC and the Dodge is parked until my 2019 GMC gets here. I am a Deisel mechanic by trade. And work on all of them. Just test drive all three last month and took them down a 15% grade had to use the brakes on the ford twice! The dodge Quite a few times, and the GMC I never touched the brake in fact I had to give it throttle. Bought the GM again! Very disappointed in the Dodge. The 2019 GM has a bigger cab like the ford. My ego was put aside many years ago and I try to be subjective and the DEF system on the Dodge has issues, the ford DEF system is put in a poor spot and we get lots of failed fuel systems from getting the DEF in the fuel tank this is a $10,000 bill every time. The GM Def system works pretty well and we see few issues since 2014. Yes thedef tank looks like a low hanging problem but put a tape on it and it is higher than the frame and higher than the diff. And if you rip a hole in it you are doing something not very dam smart to start with. Ok if your looking for a used Dodge buy the standard and find a5.9