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limited slip differential

Discussion in '2nd Gen. Tacomas (2005-2015)' started by uuc328, Sep 30, 2008.

  1. Sep 30, 2008 at 7:01 AM
    #1
    uuc328

    uuc328 [OP] Well-Known Member

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    ok, last question for today, this one is about the differential.

    my friends 2002 has LSD and a button to engauge and disengauge it on the dash. my 08 doesn't have the button but my diff has a lable on it that says LSD oil only and I confirmed with the dealer that my TRD Sport does in fact have a LSD.

    does it only become active and switch from open to LSD electronically when it is needed?
     
  2. Sep 30, 2008 at 7:09 AM
    #2
    luk8272

    luk8272 Poodoo

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    Not certain but I believe your friend has the locking rear diff which can only be locked in 4L unless he does the locker anytime mod. You have the LSD. The locking rear came with certain packages I don't recall which came with what. The Sport and Offroad. I think the offroad comes with the locker and the sport just the LSD.
     
  3. Sep 30, 2008 at 7:12 AM
    #3
    norcalbb11

    norcalbb11 Nor*Cal

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    yeah the sport has the lsd and there is just a button that has like a truck fish tailing on it, well thats my 09 sport anyways dont think they changed much from the 08 did they? i would like to burn out in my truck but with the lsd it wont let me and when i press the button it says auto lsd and i have no idea whats going on haha
     
  4. Sep 30, 2008 at 7:13 AM
    #4
    uuc328

    uuc328 [OP] Well-Known Member

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    forgot to mention that both trucks are 4X2 and only mine is TRD
     
  5. Sep 30, 2008 at 7:21 AM
    #5
    lsocoee

    lsocoee My hair is all natural Moderator

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    the button is not for a real LSD. They have an open differential and the "Auto LSD" actuates the brakes on the wheels that are spinning out of control. The TRD sport and the other trucks with the optional LSD have a true LSD. This cannot be turned on or off. The TRD offroad comes with a locking differential that can be turned off.

    I believe all 2009 come with a type of traction control that can be turned off. This was optional on previous models. This traction control is often called an "Auto LSD"
     
  6. Sep 30, 2008 at 7:23 AM
    #6
    norcalbb11

    norcalbb11 Nor*Cal

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    yeah there is a button that has the LSD in the 09 but when i press it, it says auto lsd, does that mean i can burn out or does that engage the lsd
     
  7. Sep 30, 2008 at 7:31 AM
    #7
    lsocoee

    lsocoee My hair is all natural Moderator

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    When you turn off the auto lsd you will peel out easier.
     
  8. Sep 30, 2008 at 7:45 AM
    #8
    Janster

    Janster Old & Forgetful

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    Just to clarify (and perhaps I'm not reading things correctly)...

    The Auto LSD is not a traction device (so to speak) like the mechanical LSD and the TRD offroad locker is.

    The Auto LSD is operated by the brakes and will help prevent the wheels from spinning by pulsing the brakes similar to ABS. It can help with traction by simply stopping the wheels allowing them to 'grab' again. But it does not apply driving force to the wheels like the mechanical LSD & locker does.
     
  9. Sep 30, 2008 at 7:49 AM
    #9
    lsocoee

    lsocoee My hair is all natural Moderator

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    That's the way I understand it, but with one addition. An open differential can be made to perform more like a Mechanical LSD by modulating your brakes. In this sense, the Auto LSD will provide some additional power to the other rear wheel.
     
  10. Sep 30, 2008 at 8:16 AM
    #10
    luk8272

    luk8272 Poodoo

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    Then I have a question. How can I tell which one I have on my truck. I have the Base model but was optioned with the LSD. How would I tell if it was the Auto or the actual LSD? The Sticker on the rear only says LSD is there another way to tell?
     
  11. Sep 30, 2008 at 8:19 AM
    #11
    norcalbb11

    norcalbb11 Nor*Cal

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    well if your wheels start to spin does a light flash on by the speedometer?
     
  12. Sep 30, 2008 at 8:21 AM
    #12
    lsocoee

    lsocoee My hair is all natural Moderator

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    if the pumpkin says LSD Oil, then you have a mechanical LSD. If you have a button on your dash, then you have the Auto LSD.
     
  13. Sep 30, 2008 at 8:22 AM
    #13
    luk8272

    luk8272 Poodoo

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    Very well I wasn't sure if it was the same on the 07. Thank you sir.
     
  14. Sep 30, 2008 at 8:23 AM
    #14
    luk8272

    luk8272 Poodoo

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    I have the Mechanical version. Some trucks come with a flashing light? That would suck offroading.
     
  15. Sep 30, 2008 at 8:24 AM
    #15
    uuc328

    uuc328 [OP] Well-Known Member

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    let me see if i have this strait....

    mine is LSD all the time but the TRD offroad has a faux type LSD using ABS?

    another pic just in case it helps

    [​IMG]
     
  16. Sep 30, 2008 at 8:24 AM
    #16
    norcalbb11

    norcalbb11 Nor*Cal

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    nicely done haha
     
  17. Sep 30, 2008 at 8:27 AM
    #17
    lsocoee

    lsocoee My hair is all natural Moderator

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    the offroad has an open differential that can be locked. The faux LSD probably comes on all 2009 Tacomas.
     
  18. Sep 30, 2008 at 9:34 AM
    #18
    Janster

    Janster Old & Forgetful

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    I think I'd have to disagree with ya on that....

    A mechanical LSD is operated by clutch paks in the differential carrier. The clutch paks hold the wheels together thus allowing the mechanical driving force to be sent to both wheels at the same time (up until the torque forces the clutch paks to disengage). It's not a matter of 50/50 power. When the LSD is working - it's 100% of the power to both wheels at the same time regardless of the traction surface. Until you reach a certain torque load and the clutch paks disengage.


    With an Open diff - when one wheel stops...the other wheel spins. THe power goes to the path of least resistance which is still 100% of the power just only at one wheel - nor more & no less. When you apply the brakes (or the Auto LSD), you briefly STOP the spinning wheel which then changes the path of least resistance to the other wheel briefly. This allows the other wheel to *attempt* to gain traction again only because the open carrier changed orientation of where the power was going. There is no mechanical driving force when using the auto lsd or using your brakes in an open diff.
     
  19. Sep 30, 2008 at 9:46 AM
    #19
    lsocoee

    lsocoee My hair is all natural Moderator

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    that is what I was trying to get at. You put it much better than I could have.
     
  20. Sep 30, 2008 at 7:44 PM
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    Janster

    Janster Old & Forgetful

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    :eek: Sorry I mis-understood. I hate the internet sometimes for that reason.

    ;)
     
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