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front diff locking in h4

Discussion in '2nd Gen. Tacomas' started by sierra015, Mar 2, 2013.

  1. Mar 2, 2013 at 4:23 AM
    #1
    sierra015

    sierra015 [OP] Member

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    2005 tacoma when i put it in h4 it locks the front diff but the back is not???wtf
     
  2. Mar 2, 2013 at 4:58 AM
    #2
    BulletToothTony

    BulletToothTony Gold Member

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    Is this a stock Tacoma? If so you don't have a front locker...
     
  3. Mar 2, 2013 at 6:56 AM
    #3
    Janster

    Janster Old & Forgetful

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    Need more information......

    Are you saying....that when you put it into 4WD, the front wheels ARE driving but the rear is not?

    Why do you think this?
     
  4. Mar 2, 2013 at 7:47 AM
    #4
    MGM Tacoma

    MGM Tacoma Well-Known Member

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    more info needed to really answer your questions
     
  5. Mar 3, 2013 at 5:00 AM
    #5
    sierra015

    sierra015 [OP] Member

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    in h4 it locks the front diff and the back is not locked
    when on snow 2front are spinning and one of the rear which ever one has less grip. when i make a U-turn in h4 the front wheels shake
     
  6. Mar 3, 2013 at 5:03 AM
    #6
    SoCaltaco65

    SoCaltaco65 Well-Known Member

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    Don't make u turns on dry pavement in 4x4!
     
  7. Mar 3, 2013 at 5:16 AM
    #7
    Janster

    Janster Old & Forgetful

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    Do you have a TRD Offroad truck? Do you have lockers in the front & rear diff?

    If NO....
    OR
    If you're not exactly sure what I mean by 'a locker' ....

    Then I'm guessing you have OPEN differentials. Even when you are in 4WD - one of the wheels can and won't spin depending on the terrain. The POWER will go to the wheel with least resistance leaving the other wheel stopped completely. If one wheel is on the ground and the other wheel is off the ground (in the air), the wheel in the air will spin while the other wheel will not spin at all. That's how OPEN diffs work. On these trucks - They WILL NEVER be locked together unless you have a LOCKER in the differentials.

    As for the shaking....DO NOT make tight turns while in 4WD. It will bind up the driveline and especially ruin your CV joints.
     
  8. Mar 3, 2013 at 5:41 AM
    #8
    sierra015

    sierra015 [OP] Member

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    2005 TRD Sport it has h2-h4-hl so h4 is not like 4wd or is it
     
  9. Mar 3, 2013 at 6:04 AM
    #9
    Millertime187

    Millertime187 I'll be your huckleberry!

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    H-4 is 4 wheel drive.
     
  10. Mar 3, 2013 at 7:04 AM
    #10
    SierraMare

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    Time to do your homework! Your owner's manual discusses how to operate your part time 4wd system. Here is one of several online links that discusses how it works. Take a drive with a friend who owns a 4wd truck for further training, or take a course. http://auto.howstuffworks.com/four-wheel-drive.htm
     
  11. Mar 3, 2013 at 9:10 AM
    #11
    Sparky73

    Sparky73 Well-Known Member

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    ^ Yeah, this!

    OP, you're mixing up "enaging" 4wd with having locking differentials, aka "Lockers." Your 2005 Sport does not have lockers on front or rear unless they were added.

    By switching to H-4 (or L-4), all you are doing is engaging the front wheels via your transfer case. Both your front and rear differentials are "open" differentials, not "lockers." Simply put, an open differential transfers power to the wheel with the least resistance (least traction). If a front/rear tire is spinning, the other front/rear tire will not get any power and will not pull the truck.

    The front and rear differentials operate independently of each other so it's possible that both front tires had traction (both were pulling) while a back tire had no traction (one spinning, one not moving). Basically, your truck is performing exactly as it's designed to.

    Last point, never engage 4wd on dry pavement because it will damage your drivetrain. If you're in snow or offroad in 4wd, your front wheels will not shake during tight turns, etc.
     
  12. Mar 3, 2013 at 9:22 AM
    #12
    OffroadToy

    OffroadToy The dog did it...I swear!

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    Only the Offroad model comes with a locking differencial. You have 2WD, 4H and 4L. It's a part-time 4WD system so never engage it on dry pavement. Read the links below for more information...
     
  13. Mar 3, 2013 at 9:25 AM
    #13
    Blygy

    Blygy Well-Known Member

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    What did you think H4 meant????
     
  14. Mar 3, 2013 at 9:27 AM
    #14
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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  15. Mar 3, 2013 at 11:53 AM
    #15
    Janster

    Janster Old & Forgetful

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    H2 = 2WD
    H4 = 4WD
    4Lo = 4WD low range

    You have the mechanical LSD (limited slip differential). It is better than an OPEN diff but not like a locker.

    Depending on the terrain & situation...your mechanical LSD will still slip similar to an OPEN diff. Again.....the path of least resistance. Mechanical LSD is operated via clutch paks. Those clutch paks will only lock the wheels together under a certain torque limit. Once that torque limit is reached, it will allow the wheels to slip (similar to an OPEN diff).

    Having a LOCKER in the differential - as seen in the TRD OFFROAD trucks.....when in 4lo range and when the locker is engaged, both wheels are locked together at all times regardless of terrain.
     
  16. Mar 3, 2013 at 2:31 PM
    #16
    sierra015

    sierra015 [OP] Member

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    ok i think i got it
    h2=hwy,rd
    h4-l4 only use it when needed in mud or snow or other wet stuff when stuck
    thanx all!
     
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