Again, what role would using tow/haul mode play in improving that condition? Seems taking control over gear selection and shift points would have to help. The folks I've heard from that own a Ram seem to be using the tow/haul mode almost exclusively when pulling a trailer or camper. Many also seem to favor a 4.10 rear diff.
And you can manually shift to another gear using tow/haul to slow your decent on the way down, working in similar capacity to a diesel brake. I've heard from many folks owning a 6.4 Hemi that this was a very effective technique and they only have to lightly and sporadically apply the brakes in many instances.
Have you actually driven one of these trucks with 6.4 Hemi and 66RFE or are you passing on stuff you've read? Not being sarcastic, just curious where the insights are coming from. Typed dialogue is difficult, I'm just curious what your experience is with this engine/transmission. Thanks.
Dan
