Trailer is 33' weighs in about 8000lb loaded. Smarty on #3 default everything

I pulled on the Hgway OD off at somewhere between 2200-2300 rpm EGT's around 7-800. mileage was around 16mpg according to over head.

On the way home with Tow/haul 1700-1800 rpm in OD (60-65)
mileage on overhead 14.5-15.1 EGT's 800-900F+

My dilemma is the truck is **** noisy with O/D locked out VS O/D, but the trailer seemed to pull better in O/D.

I am pretty sure I am running the 3.55 for gears. I am also on 285/70/17 E tires.

What do you suggest????

 

i feel scenario one is in order, i also think you have 410's, 17 to 1800 at 65 is lugging it if towing that is why your exh. temps went up. i like mine out of o.d. 2400 2600 rpm 65 70 mph perfect, but exh temps are higher. 900 plus

 

I always tow my fifth wheel in tow/haul (10,500 lbs). I never paid much attention to my fuel mileage in O/D versus O/D locked out. For the amount I tow I don't worry about fuel economy while towing (maybe average 1000-2000 kms a year).

I also don't have any gauges as I run 100% stock, so I can't tell you exhaust temp difference.

I do know it doesn't take much of a hill to kick it out of O/D, so most hills are pulled in 3rd with the noise you describe.

I wouldn't over think this...just tow in tow/haul, that is what it is there for.

 

With my 06 and my TT app 8000lbs, I always use tow haul mode, and try and keep it at 60 to 65, my rpm`s are below 2000, 373 gears, auto, mileage depends on head wind tail wind, mountains, my egt`s are always good, Ya but I do have a XZT tow box also,