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How can I tell if I have LSD

Discussion in 'Technical Chat' started by raskal311, Apr 17, 2009.

  1. Apr 17, 2009 at 7:57 PM
    #1
    raskal311

    raskal311 [OP] Well-Known Member

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    5100 set to max, pending LSD and TRD CAI
    So I had LSD installed today, long story but it worked out in my favor. Visually looking at the truck how can I tell if they actually installed the LSD?
     
  2. Apr 17, 2009 at 8:11 PM
    #2
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    crack open the diff cover and take a peek. There should also be a switch in the cab to engage the locker
     
  3. Apr 17, 2009 at 8:35 PM
    #3
    TL697

    TL697 Well-Known Member

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    The Limited Slip Differential or "LSD" is not a locker. It is a "posi" rear end or traction aid...

    It will look different than an open diff if you remove the diff cover, though...

    Also, if you gas it on loose ground both wheels will spin. If only one wheel spins, you don't have a LSD...
     
  4. Apr 17, 2009 at 8:54 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    No diff cover on the Tacoma rears. :)
     
  5. Apr 18, 2009 at 12:39 PM
    #5
    raskal311

    raskal311 [OP] Well-Known Member

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    5100 set to max, pending LSD and TRD CAI
    So no real easy way to find out?
     
  6. Apr 18, 2009 at 12:40 PM
    #6
    eordonez

    eordonez Living vicariously through mjp2

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    check under your truck, on the differential for a sticker "LSD Oil only" or something like that....
     
  7. Apr 18, 2009 at 12:47 PM
    #7
    EnolaGaia

    EnolaGaia Well-Known Member

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    That would only be applicable if it was a TRD clutch-type LSD that was installed (and they bothered to put the sticker on ...) ...
     
  8. Apr 18, 2009 at 2:35 PM
    #8
    raskal311

    raskal311 [OP] Well-Known Member

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    5100 set to max, pending LSD and TRD CAI
    LSD was installed by Toyota under warrenty so it should be a TRD LSD.
     
  9. Apr 18, 2009 at 2:57 PM
    #9
    no_werries

    no_werries Well-Known Member

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    I'd say do what one buddy said, hammer down on the gas, if both tires spin, or if you leave to burn out marks then you know it is an LSD, dont forget also that the LS Differential needs to be serviced more often then an open diff!
     
  10. Apr 18, 2009 at 3:01 PM
    #10
    TicTacOma

    TicTacOma UnderWater Monopoly Champion

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    Jack up the ass end, spin one wheel....If the other wheel spins opposite it's open, if it spins the same way with a definite clunk/click as it engages....LSD. I think......Chris?
     
  11. Apr 18, 2009 at 5:56 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Normally, Yes. BUT, I had an instance when I did this to a friends truck (who had an open diff) and BOTH wheels spun in the same direction. Also, An LS diff shouldnt make any noise when turning the wheels.
     
  12. Apr 18, 2009 at 6:09 PM
    #12
    higherlux

    higherlux Well-Known Member

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    question?????????
    why when u spin one tire on a open diff the other spins the other way??
     
  13. Apr 18, 2009 at 6:13 PM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Most of the time. Depending on how thick the diff fluid is.
     
  14. Apr 18, 2009 at 6:14 PM
    #14
    higherlux

    higherlux Well-Known Member

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    ok but why dose it do it??
     
  15. Apr 18, 2009 at 6:28 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The Ring gear has power delivered to it via the pinion gear. From there, the ring gear transmits the power to the other side via "Pinion" gears. It allows a change in speed from one side to the other. It only works if BOTH wheels have traction. When the truck is lifted off the ground, and the TIRE is turned, instead of the Drive shaft, and on an open diff, when one wheel is spun, the planetary gears tansmit that movement to the other side, but reversed. Also, when doing this, the drive shaft will not spin. Not sure if Im describeing it propperly.

    This may help:
    http://auto.howstuffworks.com/differential2.htm
     
  16. Apr 18, 2009 at 7:29 PM
    #16
    TicTacOma

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    It's all in my head at the moment...
    If you can get past the first 3 minutes of this it will explain the differential....LSD will be easier understood though it isn't really explained here.

    http://www.youtube.com/watch?v=K4JhruinbWc&feature=related


    And for a real treat, watch for Chris at the end doing his "Circus Bear" imitation.
     
  17. Apr 18, 2009 at 7:33 PM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    LMAO!!! Good find!
     
  18. Apr 18, 2009 at 7:46 PM
    #18
    09TRD

    09TRD it is what it is

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    Not yet,
    :DI say get on a dirt road, stomp it, sounds like the funnest way to find out:D
     
  19. Apr 20, 2009 at 7:06 AM
    #19
    raskal311

    raskal311 [OP] Well-Known Member

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    So I have two other questions, if the LSD keeps the two wheels from spinning at different speed, what happens on a turn? Wouldn’t on wheel spin faster then the other during a turn?

    Also does the LSD only engage during acceleration or is it also deceleration?
     
  20. Apr 20, 2009 at 8:16 AM
    #20
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Yes, An LSD lets one wheel spin faster or slower than the other. An LSD works by transfering more torque to one wheel or the other. When one wheels starts to "slip" and more throttle is given to the engine, the clutch pack in the diff tightens and transmits more torque to the tire that is not slipping. When the throttle is let off, torque to the diff is cut, therefore, the clutch pack in the diff releases a little bit.
     
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