4H why not on dry roads?

4H why not on dry roads?

This is a discussion on 4H why not on dry roads? within the F150 Ecoboost Chat forums, part of the F150 Ecoboost Forum category; Hi Guys, Owners manual says can not drive in 4H (or 4L) on dry pavement... Just wondering why... Also rain - wet roads are ok ...

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Thread: 4H why not on dry roads?

  1. #1
    Rookie ATM's Avatar

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    4H why not on dry roads?

    Hi Guys,

    Owners manual says can not drive in 4H (or 4L) on dry pavement...
    Just wondering why...
    Also rain - wet roads are ok in 4H?
    It says slippery conditions like mud and snow or gravel for 4 wheel drive.
    Wondering if wet roads are ok for 4H since the extra traction wouldn't hurt... I guess.

  2. #2
    Gold Supporting Member Marvin's Avatar
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    If you drive in 4-L or 4-H on dry pavement, your driveline will get wound up: the front and rear wheels cannot turn at different rates going around corners, etc. and tension develops in the shafts and transfer case. If you do it enough you'll break something eventually. Not to mention that the thing will understeer like crazy.

    On slippery surfaces the wheels can slide and relieve that tension.

    Wet pavement isn't slippery enough to use 4WD on an ongoing basis, in my view. If I were on a wet boat ramp, or in a similar situation, then it's appropriate. But not for general driving.
    Last edited by Marvin; 07-17-2015 at 03:07 PM.
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    Pax.

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    Eco-Beast norcal_ecoscrew's Avatar

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    Quote Originally Posted by Marvin View Post
    If you drive in 4-anything (the than 4A) on dry pavement your driveline will get wound up.
    Yup. The transfer case locks the front and rear diffs together so your 4x4 system will bind up and potentially break something if you try turning while in 4x4 on dry pavement.

    Generally you'd be okay to run 4x4 on a straight line for a short time on dry pavement, but if you try turning you'll notice it drive real funky like and you'll hear your tires scrub.

    This is standard for pretty much all 4x4 systems, the difference between 4 and all wheel drive is the ability for the transfercase/center diff to distribute power to either front or back independently.
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    Ecoboost Veteran BLOWBYU's Avatar

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    4H why not on dry roads?

    So what about trucks that have 4 auto option? I will typically drive my truck in 4 auto when raining.


    2013 Eco Lariat CrewCab 4x4 Off-Road ShortBox w/3.73
    2013 Ford 150 Lariat CrewCab 4x4 w/3.5 Eco and 3.73 Gears

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    Gold Supporting Member Marvin's Avatar
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    I think the manual says it's OK. I personally don't bother.
    Pax.

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    Ecoboost Sr Member Boost and hoes's Avatar

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    While on topic I know 4h is for off road but what about dirt roads? Like a dirt road in the mountains, is there enough slip? Also what speeds should you limit yourself both in 4h and 4low?

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    Eco-Beast Sherman's Avatar

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    dirt roads are fine, but i would avoid using it if you don't have to. you're just causing extra wear. even in winter time i don't use 4h or 4a, unless the roads are really bad and im unable to gain traction.

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    Ecoboost Master Ecoboost Clark's Avatar

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    I run mine in 4 Hi when launching at drag strip.
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    I run 4hi on dirt and gravel sometimes over 70mph. It's fine.

    Lots of guys race in 4hi at the strip. As long as you don't try any turning its pretty safe to do on pavement.

    4A is gtg on dry pavement, but I wouldn't if you don't need to. The 4a option is using a clutch pack of viscous coupling to send power to the front, it's basically an AWD system. I think on our trucks though the power is only transfers to front when the rear slips when in the 4a option.

    EDIT: And FWIW I don't think I've ever used 4lo on my ford, but I'll say if your going faster than 10 mph in 4lo you probably don't need to be in it.
    Last edited by norcal_ecoscrew; 07-17-2015 at 07:06 PM.
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    Eco-Beast Sherman's Avatar

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    4lo would be used for like pulling a boat out of the water, or someone out of the ditch... or crawling (which i don't know why you would in a truck)

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