Good more, I recently purchased a 13 F350 Kings Ranch with the 6.7 with only 67k miles wells taken care of.

I also purchased a large camper about 3600 lbs for it. The truck has airbags. It carries is well no struggles.

My question is do I tow in tow haul mode or not just carrying the camper?

My second is and I realize there are different determining factors like weather load grade etc, what would be the normal “safe” transmission temp? There will be times I’ll tow the flatbed with the Razor on It and other items. (Has anyone felt the need to add a second trans cooler, where you would put I don’t know)

What would be safe engine temp?

thnx

 

As I understand it, tow/haul can be used with zero load or heavy. It’s personal preference and the transmission can handle either mode and load.

Where it differs from my Overdrive On/Off(4R100) is your 6R140’s tow/haul mode can use all gears, downshifts automatically when applying brake, and there’s less gear hunting.

Congrats on the truck, sounds nice!

 

Thank you, I have read it could be hard on the over drive so I think in tow haul mode would be best. Just need to find what temps re safe for the trans n engine. Thnx again.

 

If the truck is 100% stock, just drive it. The ECM, &TCM will not allow it to hurt itself. Trans is thermostat controlled, oil to coolant heat exchanger. 205 - 225 temps normal. Engine oil temps up to 240ish when running in summer temps normal.

 

You have read incorrect information. Using tow/haul does not prevent the transmission from using overdrive.

 

Even though "it" in the OP's quote above is not clearly defined, one potential interpretation, supported by the context of the previous posts, could be that "it" is referring to not using Tow/Haul mode.

If true, then substituting "it" for this interpretation, the sentence could be rewritten as "I have read that not using Tow/Haul mode could be hard on the overdrive."

This isn't pointed out to pick nits... this is brought up to gain better understanding in answer to the OP's original question.

Regardless of what the OP meant by "it", the OP did NOT say that he read that using Tow/Haul mode "prevents the transmission from using overdrive."

On the contrary, he said that it could be hard on the overdrive.

This distinction is important, because suggesting that the OP read something that the OP did not say he read ends up overlooking the really good question that he asked in the first place... and that you are very well qualified to shed more insight on.

So if my guess is correct by what the OP meant by "it"... here is the learning opportunity that presents itself:

If Tow/Haul mode alters shift scheduling in favor of delivering power to the ground over fuel economy, by lingering longer in each gear, winding up the RPMs a little more in each gear before shifting, and/or other tactics intended to manage heavier loads... does not using Tow/Haul mode end up being harder on the overdrive, because overdrive is entered into too soon (in order to save fuel), whereas in Tow/Haul mode, the shift to overdrive is delayed a bit longer, to make sure that the loaded vehicle momentum can more effortlessly support the gear multiplication?

 

Using TH is a personal preference you just have to try it and decide what works best for you. Sometimes I use it and sometimes I don't, it depends on what kind of roads I'm on. When traveling on 2 lane roads it's nice because of the transmission downshifting when the brakes are applied going through towns but at times I dislike it because it holds the gears to long. Personally I like the manual mode for more control when needed.

Denny

 

You have interpreted my “it” (the transmission) correctly. I don’t believe the engine goes into overdrive.

The article I was referring to spoke about the transmission continuously shifting in and out of overdrive and the resulting heat and wear by doing so.

Today I drove in overdrive and then switched to toy haul, the transmission did in fact drop several degrees from 205 to 198.

I am not well versed in this transmission and its capabilities but I will soon will be.

I appreciate the sesnopser.

 

Engines don't go into overdrive. Transmissions go into overdrive.

That is correct. If the trans is frequently shifting in and out of overdrive it adds a lot of heat and wear. This is true if the trans is in tow/haul or not. It is less likely to frequently shift in and out of overdrive when in tow/haul.

 

You have a couple options. A. Press the tow/haul button and the trans will hold gears longer.
B. Press the - on the +/- button on the shift lever, this will lock out 6th gear, press again it will lock out 5th and 6th gear and so on until you get all the upper gears locked out. Press the + side of the button it unlocks a gear for each press of the button. Play with it and learn how it works.
C. Put gear selector in “M”. Then use the +/- button to shift gears manually, just like a manual transmission, only without a clutch.

The 6R140 is a hell of a good transmission and the user controls are great, you iust need to learn to operate it.

And just FYI, in this trans, both 5th and 6th gears are overdrive gears in the the ratio is greater than 1:1.