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Stupid Noob Question about 4HI

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 28ØØ3, Jan 14, 2009.

  1. Jan 14, 2009 at 10:26 AM
    #1
    28ØØ3

    28ØØ3 [OP] Well-Known Member

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  2. Jan 14, 2009 at 10:49 AM
    #2
    all.on.black

    all.on.black Well-Known Member

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    You can engage and disengage 4x4 under 62mph. You can drive in 4x4 as fast as you like I tend to keep it under 60.
     
  3. Jan 14, 2009 at 10:55 AM
    #3
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I don't drive over 55 in 4wd. The main reason isn't for possible damage to the transfer case and differential, it is because if you have to drive in 4wd then speed is not warranted for the conditions.

    As far as actual damage occurring to the the system, I can only think of a possible heat build up that might limit the life span of the oil/lubrication in the transfer and differential. The gearing to 4wd high should be close to the gearing in the rear. I am sure some one wth exact numbers will chime in. (and correct me if I am wrong)
     
  4. Jan 14, 2009 at 10:57 AM
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    JVTACOMA

    JVTACOMA Well-Known Member

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    put it to you this way....if you drive mainly on paved roads and are traveling at 50MPH you prob. don't need 4WD in snow or not. 4wd at 50 on a snow covered road is to fast IMO The final drive ratio in 4hi and 2hi are the same. I've driven at 65MPH in 4hi with no problems. I have an 03 and according to the owners manual it says to slow down below 62MPH to shift from 2Hi and 4Hi or 4Hi to 2Hi so i guess you can haul ass without any worries!!!
     
  5. Jan 14, 2009 at 11:15 AM
    #5
    Janster

    Janster Old & Forgetful

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    I flip my 4WD on in heavy rainy conditions when I get on the highway. I've gone close to 65mph but not any higher than that. I do that for a couple reasons - peace of mind in rainy conditions (keeps the truck from getting squirrely) and to run it atleast once a month to keep things 'running' and lubricated (so to speak). I only use it in heavy rains and I don't make any turns. As soon as I get off the highway, I flip it back to 2WD.

    Obviously, snow is a different story and I have it in 4WD all the time in the snow.
     
  6. Jan 14, 2009 at 11:21 AM
    #6
    Demoncleaner

    Demoncleaner Well-Known Member

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    109, though I dont recommend it.
     
  7. Jan 14, 2009 at 12:37 PM
    #7
    zmtnbik

    zmtnbik FMLYHM

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    This is also covered in the owners manual.
    For the record I have gone as fast as 70, this was a result of the roads clearing up and traffic speeding up at the same time and I couldn't switch back into 2 wheel drive.
     
  8. Jan 14, 2009 at 12:39 PM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Nice Avatar...........:p
     
  9. Jan 14, 2009 at 3:16 PM
    #9
    wawireguy

    wawireguy Well-Known Member

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    If it's iced over I keep it in 4wd. 60-70mph is the norm for icy conditions on the interstate here. If it's wet I would drop it to 2wd you can feel a little bit of pulling and jerking when it's dry enough to be in 2wd. Toyota mechs told me it was better to switch in and out of 4wd when not moving.
     
  10. Jan 15, 2009 at 6:39 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I was refering to zmtnbik, but yours is cool too. Better than mine.
     
  11. Jan 15, 2009 at 7:37 AM
    #11
    j4x4ar3

    j4x4ar3 Well-Known Member

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    I'll have to find it again but there's a YouTube video of a guy with a supercharger pulling 13 and 14 second 1/4 mile runs with 4WD engaged. Although I think he's stupid the 4WD system is pretty strong IMO.

    As others have said though.. if you're doing under 62 you can engage 4HI however if you need 4WD you should be going a lot slower than that.
     
  12. Jan 15, 2009 at 8:16 AM
    #12
    AK27

    AK27 Well-Known Member

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    i have 4x4 on my truck and i rarely use it for highway driving even in bad conditions (have a great set of tires). the only time i use it is on logging roads when needed and the occasional slippery hill/backroad
     
  13. Jan 23, 2009 at 7:42 PM
    #13
    mainerinexile

    mainerinexile Well-Known Member

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    Damage to the transmission isn't the real issue. If you need to be in 4WD because of road conditions, then the collision will cause damage to the truck body if you go over 45! Going 70 in 4WD? Insane!
     
  14. Jan 23, 2009 at 9:26 PM
    #14
    sonjay

    sonjay Well-Known Member

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    Going any speed won't hurt anything in 4x4, unless your front drive shaft is bent or really out of balance. Although I wouldn't try it. Things will get hot, especially on dry pavement. I don't think you should be driving very fast if you need 4x4 though.
     
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