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Simple? That's an assumption on your part at least in my case.The simple answer is a lighter trailer.
You do not have enough truck for the hills. Changing out the gear ratios will make a difference, but not as much as you are hoping for.
So yesterday I pulled our TT this past weekend home from the RV park we kept it at. Trip was about 200 miles. I learned my truck does A LOT better when I’m not fighting a high wind. I’ve pulled our TT 3 other times and all 3 times the wind was blowing at least 15 and up to 25 mph. Yesterday I kept it in 4th gear and was an to hold 68-70 with no issues at least on flat highway. Obviously hills slowed me down some but on this trip there weren’t any steep hills just rolling hills. Weighed the rig at a Cat Scale and it was heavier than I thought at 10,300. My total gross combined weight was 18180. Curb weight of the truck is about 6900 which means I had about 800 pounds of stuff in the bed and cab including me and my wife which was half of that weight (this didn’t include tongue weight). I was pleased the way it pulled. I just have to stay away from the wind which along the Texas coast where we go is pretty hard to do.The unfortunate thing is that while shorter rear gears will give you more torque to the wheels, it will not give you more horsepower which is what dictates how fast you can go. The 6.4L does have a lot of horsepower, but like most N/A engines you don't a lot of it at rpms down low where you normally drive like diesels or gas turbo charged engines do. Adding 4.10s will not put you in that much higher of rpm to make substantially more horsepower. I haven't seen the dyno, but your 6.4L is likely making around 150 hp under 1,700 rpm while a diesel is making around 300 hp under at 1,700.
I honestly think taking out 5th and 6th gear(and possibly 4th) might be the solution if you want to travel at 70 mph towing your trailer. It would be better if you can swap your 66RFE for a 8HP75 found in the newer models.
View attachment 505506
Not on my truck .... is this just an HD 2500 and up thing? I know you could turn it off with tow haul in the past even on 1500s from what I have read on the forums, but on the 1500s with the 8speed like mine, nope doesn't work ...^^
Tow haul prevents MDS from activating
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 ..I had a ‘19 DT 1500 and now a ‘21 2500. Tow/haul blocked MDS on both
No have 4:10 want 4:56Did you go this route?