Tow Haul button

[cavie]

If my trailer is hooked up my tow mode is on. Leave it in 5 gear.

[Cpd]

Thanks!

[Bob Denman]

Originally Posted by Cpd

Like I said...ignorant. thanks

There's no such thing as a stupid question: only answers that need further explanation.
We often learn best; when we find something that we don't know much about... and need to know more about it.
I call that: "Filling in the gaps!"

[Cpd]

Thanks Bob

[Bob Denman]

Every Day can be a learning adventure...
If we're smart enough to admit what we don't know!

[Beau388]

Originally Posted by Cpd

Is this of any use going uphill? Sorry to be so ignorant but not too knowledgeable about it
Thanks

Ford tow/haul mode works somewhat different from the other makes of trucks. First tow/haul mode raises the transmission's internal hydraulic pressure (by 40%) to cope with clutch slip with a heavier load. It reprograms the transmission's shift points - both up-shift and down-shifts. It holds the transmission in the present gear for much longer before up-shifting to reduce transmission temperature and down shifts more aggressively to aid in slowing the coach. For instance: my normal no-load up-shift point into 6th is 48 mph but with tow/haul in it is 64 mph. Tow/haul mode reduces the engine torque by 50% when up or down shifting to reduce transmission slip and thus the overall transmission temperature.
Transmission heat is what usually kills the transmission. The cooler you can keep the transmission fluid the longer the transmission will last. The main purpose of tow/haul mode is to mitigate the transmission temperature when towing a heavy load. That it also helps with braking is a plus.

[Cpd]

Thanks!

[ducksface]

Beau,
Trans coolers are cheap and easy to install.
Do you recommend us to upgrade, or is the little factory one OK?
Thermostat fan cooled bigguns are $150+-.
That seems pretty inexpensive if they do anything, percentage wise, over the little factory unit....

[Beau388]

Originally Posted by ducksface

Beau,
Trans coolers are cheap and easy to install.
Do you recommend us to upgrade, or is the little factory one OK?
Thermostat fan cooled bigguns are $150+-.
That seems pretty inexpensive if they do anything, percentage wise, over the little factory unit....

The bottom fourth of what you think is the radiator, it is really the transmission cooler. Transmissions don't like temperatures below 40 F so the radiator's fluid helps with transmission warm up to desired operating range. You have a transmission temperature gauge on the upper right of the gauge pod. If it doesn't move up to near the hot section, (200F) you are fine. The same transmission is used behind the Ford 6.7 Powerstroke diesel and is rared for a maximum of 1,400 nm of torque. The V-10s torque is rated at 625 nm, so there is a lot of head room even for a 30,000 lb chassis