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Opinions on running 4X4H at 70-80mph?

Discussion in '3rd Gen. Tacomas (2016+)' started by GeauxTRD, Dec 6, 2018.

  1. Dec 6, 2018 at 7:55 AM
    #1
    GeauxTRD

    GeauxTRD [OP] New Member

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    I have to drive a lot in the mountains on I-70 in Colorado in snowy/icy conditions. I usually run 4H if there is any snow on the road or if the roads are wet in sub freezing temps. They do a pretty good job maintaining the road conditions, so I can safely run 70-80mph at times on long straight aways. Will running those speeds in 4H cause any damage/problems to my taco? I’ve read a lot of people saying that you shouldn’t run faster than 50-60mph, but my Tacoma seems to run great at 70-80 in 4H. Thoughts?

    2018 TRD Off-Road 4X4
     
  2. Dec 6, 2018 at 7:57 AM
    #2
    MR E30

    MR E30 Well-Known Member

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    You can't engage 4HI over 50 something mph per the manual, but I have driven all sorts of 4x4 vehicles in 4hi at freeway speeds.

    Your gas mileage will suffer, but I wouldn't worry about doing it.
     
  3. Dec 6, 2018 at 7:58 AM
    #3
    bijick

    bijick such mods much want

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    No problem at all running 4h at any speed. It was designed to go as fast as the truck will let it, just actuator max speed is 60
     
  4. Dec 6, 2018 at 7:58 AM
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    doorsidedown

    doorsidedown Well-Known Member

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    I don’t have any helpful info that actually answers your question, but I think if the roads are “safe” enough to run 70+ mph then you probably don’t need to be in 4x4.

    Just my .02
     
  5. Dec 6, 2018 at 7:59 AM
    #5
    synaps3

    synaps3 Wag more bark less

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    Isn't it foolish to travel that fast in conditions that would require 4wd?

    I'm speculating here, but the transfer case and front gear set may not be designed to handle load above 50mph. There's probably valid reasons Toyota advises against it, so I'd err on the side of caution.
     
  6. Dec 6, 2018 at 8:02 AM
    #6
    koditten

    koditten Well-Known Member

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    I do it all the time here in Michigan. Can have dry roads for 2 miles then the highway is snow covered. In those situations I just leave it in 4 high.

    I do slow down on the snowy sections, and I hope you do too.
     
  7. Dec 6, 2018 at 8:03 AM
    #7
    Extra Hard Taco

    Extra Hard Taco Soy-free meat eating male

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    Snow/ice + 70-80 mph = brilliant
     
  8. Dec 6, 2018 at 8:04 AM
    #8
    GeauxTRD

    GeauxTRD [OP] New Member

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    It’s a very windy interstate in the mountains and 4WD is required on the sharp turns in these conditions. But On the straight aways you can safely cruise at 70-80 as long as it’s not a blizzard and visibility is good.
     
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  9. Dec 6, 2018 at 8:06 AM
    #9
    GeauxTRD

    GeauxTRD [OP] New Member

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    Yes, the roads are very similar here. Can be dry for a while, then you are in conditions where you definitely want 4WD.
     
  10. Dec 6, 2018 at 8:09 AM
    #10
    koditten

    koditten Well-Known Member

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    Actually, your MPG won't suffer at all.

    Cruising in 4hi at 60 MPH or lessless be much more efficient than 80+ in 2 hi.
     
  11. Dec 6, 2018 at 8:10 AM
    #11
    StevoNB

    StevoNB Well-Known Member

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    I never drive 80, but 60-70 at times while slowing down for extra snowy sections or to pass slow traffic. Won’t hurt the 4wd at all.
     
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  12. Dec 6, 2018 at 8:12 AM
    #12
    Prjct_Vodo

    Prjct_Vodo Active Member

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    There's a great YouTube video from Engineering Explained that goes over the concept of part-time 4wd and how to properly use it ... Long story short I'd definitely slow down and not exceed the speed Toyota says (which I think is 50mph) during the turns and windy roads
     
  13. Dec 6, 2018 at 8:16 AM
    #13
    jsi

    jsi Well-Known Member

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    Maybe 3rd gens are different than my truck, but I only have part time 4wd. I try to avoid running in 4wd if the roads aren't a little bit slippery. If the roads are slippery enough for me to need 4wd then 70+ mph = being in the ditch or worse.
     
  14. Dec 6, 2018 at 8:18 AM
    #14
    Wulf

    Wulf ️TuRD

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    It's ok if you have 4wd :luvya:
     
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  15. Dec 6, 2018 at 8:27 AM
    #15
    JoeCOVA

    JoeCOVA Well-Known Member

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    Based on some of the logic in this thread, I wouldnt be able to drive a subraru on the interstate.

    There are no issues with running 4wd at any speed and contrary to popular belief Toyota does not put a max speed on 4wd, simply the maximum recommended speed for SHIFTING into 4wd.
     
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  16. Dec 6, 2018 at 8:31 AM
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    Prjct_Vodo

    Prjct_Vodo Active Member

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    Subarus are asymmetrical 4wd which is pretty much full time unless you have an STI trim to adjust those settings .. my understanding is he's asking about how he would use the part-time 4wd system which is geared a little differendif and can only "properly" or "shouldn't exceed" a certain speed limit.
     
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  17. Dec 6, 2018 at 8:32 AM
    #17
    RoninWanderer

    RoninWanderer Well-Known Member

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    Subarus are All-Wheel Drive and are a completely different system than our Part-Time 4WD vehicles. They don't have a transfer case to start and have an open middle diff usually.
     
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  18. Dec 6, 2018 at 8:32 AM
    #18
    RoninWanderer

    RoninWanderer Well-Known Member

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    beat me to it!
     
  19. Dec 6, 2018 at 8:34 AM
    #19
    dung

    dung Active Member

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    Subaru has an AWD system that is meant for continuous use and won't bind in turns. The Tacoma is not the same.
     
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  20. Dec 6, 2018 at 8:34 AM
    #20
    JoeCOVA

    JoeCOVA Well-Known Member

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    We know what the difference mechanically, the point is you can drive whatever speed you want regardless. Part-time vs full-time is completely irrelevant in this discussion.

    False

    We arent talking about turning...we are talking about speed
     

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