Simple answer, the powersroke is awesome. Has more power, pulls very strong, doesn't over rev or anything(I was concerned about that). The cummins does have alittle more torque right at the very bottom end, low engine rpm, but you actually only use that when not towing. It was happy to drive around at 1000 or 1100 rpm when you were not going very fast (50-55 mph), but when towing in tow hual mode it made the engine run at a higher rpm (downshifting the transmission) so you actually don't run much different rpm to the powerstroke while towing. Fuel economy seems to be identical. Very happy with the Ford engine.

 

I'm glad you like the engine. I have had mine 2 months and love it. I had a 7.3 for 14 years but the 6.7 is so much better.

 

 

So, made in back home, 3000 miles towing with it. Of all the unbelievable things, lowering the tire psi on these michelin's helped. Running alittle under 60 upfront and just over 60 on the back. I am still going to change away from these tires.

 

I guess I didn't realize you had the Michelins. While Michelins are typically industry standard the ones that come OE on these trucks I have never been impressed with. By comparison I love my OE Wranglers. BTW: I am shocked at this revelation as every previous truck came with Wranglers as OE tires and I hated them all.

After much testing I have settled on 58 psi F/R as unloaded pressures and 60/60 F/R when towing. (I should note that I bumper pull a 9K lbs trailer) These pressures result in the best tire wear and stability.

 

Looks like we ended up at pretty much the same tire pressures. Also, once these tires wear down/age, (tread becomes stiffer) they likely will drive better.

 

Perhaps. My neighbor has what is basically an identical truck to mine except his is a 6.2 and it has the Michelins on it. I think the OE Michelins are not as good unloaded. The small tread blocks seem to squirm too much. I have also seen these chunk quite a bit.

For reference: I am a vehicle dynamics engineer by trade and have been driving racing cars for 30+ years. In that time I have done more tire tests that I could count.

 

Well a stiff side wall and soft tread would give a squirming feel for sure. I know on bfgoodrich ko2 have a less tread depth in a load range E then in a D. Likely for that reason.

 

Who did the rail install? Is there play in the hitch? Pin ahead of the axle? Why not the factory puck system?

 

The hitch is all installed correctly, ahead of the axle about 1.5". Dealer didn't want to install the factory setup, said it was expensive to do. Also I already had the curt hitch, just needed the rails.