Originally Posted by BroncoHauler
Doesn't a V10 E350 have the Tow/Haul mode? Were you using it for the downhill?
I find tow/haul inadequate for steep downhills--it tends to drop into lower gears suddenly, sending the rpms through the roof. I use it to downshift from overdrive to 4th, then drop into lower gears manually. (Requires taking it out of Tow/haul before shifting so you can brake to the lower speed without shifting too early. A PITA). A friend who worked for TRD in 90s told me their engineers didn't implement it cuz they thought it was marketing--though I think Toyota offers it today.
Originally Posted by haywoodphotomaccom
Yes, using the tow/haul, low range 4x4 and 1st gear. Van was revving to 4800 the entire way down the hill and still needed the brakes almost the entire way down...
Although I had the Tow/Haul on does it do anything in low 4x4 1st gear?
Tow/haul only works in the Drive setting. When you downshift manually, it is irrelevant. Low 4x4 and 1st gear is as low as you can go with the transmission. A silly question but did you lock the hubs? 4800 is awfully high. I've driven some pretty steep hills--as in, "did anyone see the road that was in front of me a minute ago?"-- and stayed below 3000 with my foot off the accelerator and breaking only occasionally.