Question for @Mark Kovalsky - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 05-07-2018, 11:17 AM Thread Starter
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Question for @Mark Kovalsky

What is the proper protocol for using transmission overdive and the other gears of a 4r100 when :
towing heavy on flat ground ?
rolling hills ?
long grades ?

While going down hill is it ok to turn off OD and/or use 2nd gear for speed containment ?

I've gotten different info from different sources and it just dawned on me that you might have the most uh, um believable answer. (lol)

Thanks
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post #2 of 25 Old 05-07-2018, 11:20 AM
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Originally Posted by oilcan1001 View Post
What is the proper protocol for using transmission overdive and the other gears of a 4r100 when :

towing heavy on flat ground ?

rolling hills ?

long grades ?



While going down hill is it ok to turn off OD and/or use 2nd gear for speed containment ?



I've gotten different info from different sources and it just dawned on me that you might have the most uh, um believable answer. (lol)



Thanks

B4 mark chimes in and make any corrections/mine included...

From what Iíve read directly from him - let your transmission shift into what gear it wants (4r100) would be the right course of action. Or at least thatís how I understand it.


ďDonít overthink something simple people... ..:sigh:..Ē
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post #3 of 25 Old 05-07-2018, 12:05 PM
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I could not verify that he is a member here

I searched for a while just recently

but he is on the Nation

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post #4 of 25 Old 05-07-2018, 12:12 PM Thread Starter
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I could not verify that he is a member here

I searched for a while just recently

but he is on the Nation
Sorry, I though he was here also.
This is my go to forum so I just assumed
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post #5 of 25 Old 05-07-2018, 12:18 PM
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #6 of 25 Old 05-07-2018, 12:21 PM
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Heís on Ford trucks.com.



Thereís another reply where it says you donít need to turn off of going up hills - wastes fuel and makes oil company money etc IIRC.

Also another specifically noting not to touch of unless itís to downshift - no need. Let the 4r100 do what it wants etc.


ďDonít overthink something simple people... ..:sigh:..Ē
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post #7 of 25 Old 05-07-2018, 12:46 PM
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@bismic .......
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post #8 of 25 Old 05-07-2018, 12:54 PM
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Quote:
Originally Posted by oilcan1001 View Post
What is the proper protocol for using transmission overdive and the other gears of a 4r100 when :
towing heavy on flat ground ?
rolling hills ?
long grades ?

While going down hill is it ok to turn off OD and/or use 2nd gear for speed containment ?

I've gotten different info from different sources and it just dawned on me that you might have the most uh, um believable answer. (lol)

Thanks


Go by how your trucks goes.... For example my common flat ground/heavy scenario.

heavy/flat ground: Im pulling an 8.5k 5th wheel I use tow/haul to get to about 55-60 and sometimes 65if its straight and then I turn off tow haul. If the truck can maintain speed/power without needing to shift I let it be. Sometimes driving a couple mph faster/slower puts your trucks speed at the sweet spot. (tire size,gearing,mods play into this). Sometimes if I pull a gooseneck loaded with round/square bails I don't turn off tow/haul and keep it nice and slow....

long grade: when I approach a hill I turn tow/haul on again and maintain 55mph unless corners or grade dictate less for safety. You can hear/feel the truck either bog down or stay in the powerband everyones truck reacts differently there is no magic formula just general guidelines.


when on rolling hills go by the truck, you can plan you speeds to keep the truck in the power band and almost never shift as long as traffic is going steady.


sometimes I cant drive down the freeway at normal speeds without having to use tow/haul and sometimes I don't use tow/haul except when pulling over or back onto a highway/freeway.


my rules of thumb that work well for me:

light towing under 2,000lb I don't use tow/haul-generally truck doesn't so I don't use it.

anything above 2,000lb like for car/trailer combos or truck on a trailer and small equipment I use tow/haul when I need and if I can maintain safe highway speeds out of towhaul I do to conserve fuel and switch tow mode when truck needs to.

heavy loads 10k/lb or more I generally don't tow far enough to get out of tow/haul mode.

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post #9 of 25 Old 05-07-2018, 05:49 PM
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Quote:
Originally Posted by JustinOOO9 View Post
Go by how your trucks goes.... For example my common flat ground/heavy scenario.

heavy/flat ground: Im pulling an 8.5k 5th wheel I use tow/haul to get to about 55-60 and sometimes 65if its straight and then I turn off tow haul. If the truck can maintain speed/power without needing to shift I let it be. Sometimes driving a couple mph faster/slower puts your trucks speed at the sweet spot. (tire size,gearing,mods play into this). Sometimes if I pull a gooseneck loaded with round/square bails I don't turn off tow/haul and keep it nice and slow....

long grade: when I approach a hill I turn tow/haul on again and maintain 55mph unless corners or grade dictate less for safety. You can hear/feel the truck either bog down or stay in the powerband everyones truck reacts differently there is no magic formula just general guidelines.


when on rolling hills go by the truck, you can plan you speeds to keep the truck in the power band and almost never shift as long as traffic is going steady.


sometimes I cant drive down the freeway at normal speeds without having to use tow/haul and sometimes I don't use tow/haul except when pulling over or back onto a highway/freeway.


my rules of thumb that work well for me:

light towing under 2,000lb I don't use tow/haul-generally truck doesn't so I don't use it.

anything above 2,000lb like for car/trailer combos or truck on a trailer and small equipment I use tow/haul when I need and if I can maintain safe highway speeds out of towhaul I do to conserve fuel and switch tow mode when truck needs to.

heavy loads 10k/lb or more I generally don't tow far enough to get out of tow/haul mode.
Your 4R100 has tow haul mode? Or are you talking about a 5r110 in a 6.0?

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post #10 of 25 Old 05-07-2018, 07:59 PM
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Here is my 2 cents worth, I'm towing a 10K 5th wheel and I depending on the terrain I will take it out of OD and even sometime's drop it into 2nd gear. I've learned that sometimes the transmission will not drop a gear when needed, the rpm's get low and this causes high EGT's, so by taking it out of OD or even a lower gear because you might be pulling a steep grade. When towing you have too pay attention too you're EGT's, and transmission temp's.
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