Well then waddafawk! lol ..... I though tow haul didn't disable MDS anymore ... I must be stuck on an old thread or something in my head lol ..
Good to know though, pretty cool that it does that now ...
Thought I read that tow/haul on 2018 RAm 1500 just locks out 8th and you can only go as high as 7th gear unless you floor it ....
On the 5th gens, both T/H and gear limiter instantly disable MDS. Apparently it works differently on 4th gens like yours. But yeah with T/H I will never hit 8th gear with my 3.21, either it actively prevents it or the threshold for shifting into 8th is so high I'll never hit it pulling my trailer.
@JerryETX, the F150 has a lot more HP/Torque than the 6.4 BGE. It's not designed for "max" power, it's designed to make "good" power "reliably", hour after hour, day after day, which is a whole different matter.
There is also the 6.4 SRT which is very closely related to your engine, but makes like 70 more HP. It's only found in cars and the Jeep Grand Wagoneer because it's not designed to work hard.
So it's not that Ram is behind Ford, it's that these 2 engines are built for 2 different tasks. Your 6.4 should be compared to the 6.2 in the F250 and then you will see similar performance as you get in your 2500. The F150 will acelerate quickly, but it's not rated to pull max load and go 4500 RPM's for 12 minutes straight like your engine is. That's the difference. The F150 would explode if it did that day in day out.
And also note that Ford doesn't put that 3.5 turbo in their F250's either, even though it makes more peak power than the Ford 6.2. Same reason; the 6.2 makes reliable power, the turbo doesn't.