1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Auto LSD vs. Locking Rear Diff

Discussion in 'Technical Chat' started by jftaco, Nov 29, 2008.

  1. Nov 29, 2008 at 9:06 AM
    #1
    jftaco

    jftaco [OP] Member

    Joined:
    Nov 29, 2008
    Member:
    #11120
    Messages:
    17
    Gender:
    Male
    Northern California
    Vehicle:
    09 PreRunner Off Road Pkg
    Just got a new 09 access cab w/ Off Road pkg and have been reading the manual and pushing buttons trying all the new safety ('STAR') features and traction capabilities of the truck (4x2).

    • Auto Limited Slip
    • Locking rear diff
    • Vehicle Stability/Traction control
    Nice that they've packed all those in to the Off Road edition.

    While it's my understanding that the stability control is an always-ON function/feature, I also see from reading the manual that it is turned off when either the Auto LSD or Locking rear diff features are activated. Okay, fine.

    I also find it a bit strange that my 1998 Pathfinder, which has a limited slip differential, isn't something that has to be 'engaged' or turned on, as is the case with the Auto LSD in the Tacoma. Granted, the Pathfinder doesn't have vehicle stability control, but I gotta wonder why call something 'Automatic' when you have to do something manual in order to engage/enable it?

    I also found that, when I played with the Locking rear diff feature, I had a bit of difficulty turning it OFF. Just pushing the button to DISengage it wouldn't do the trick, and I had to be in motion for about 20 feet or so, after pushing the button, before it would actually turn off.

    Anyway, new to the forum, and glad to be here! Just throwing some comments out there as a new owner. Comment as you see fit. :)
     
  2. Nov 29, 2008 at 9:14 AM
    #2
    TengoTaco

    TengoTaco Wish i was wheelin

    Joined:
    May 26, 2008
    Member:
    #6892
    Messages:
    613
    Gender:
    Male
    First Name:
    Tyler
    San Diego, CA
    Vehicle:
    2001 TRD stock
    None
    Welcome to the forum. I would double check which you have, an LSD or a rear locker, its going to be one or the other. Sounds like you have the rear locker though... Enjoy the new truck!
     
  3. Nov 29, 2008 at 9:29 AM
    #3
    jftaco

    jftaco [OP] Member

    Joined:
    Nov 29, 2008
    Member:
    #11120
    Messages:
    17
    Gender:
    Male
    Northern California
    Vehicle:
    09 PreRunner Off Road Pkg
    Thanks for the reply... I have both. It's all part of the Off Road package in the '09 V6: Auto LSD and Locking Rear Differential.

    I just tried both, and the Auto LSD works fine (well, turns on fine anyway). To turn on auto LSD, you have to turn OFF the VSC.

    To turn on the locking rear diff, you have to just press the LRD button, which in turn disables VSC.

    Anyway, when I now try to turn on the LRD function, the indicator just blinks and blinks and blinks (it's supposed to blink only for a few seconds, then light solid). I think there's a problem with it. Only 200 miles on the truck. Bummer.
     
  4. Nov 29, 2008 at 9:35 AM
    #4
    TengoTaco

    TengoTaco Wish i was wheelin

    Joined:
    May 26, 2008
    Member:
    #6892
    Messages:
    613
    Gender:
    Male
    First Name:
    Tyler
    San Diego, CA
    Vehicle:
    2001 TRD stock
    None
    Wow LSD and RLD, I guess thats new for the 09's. You have to have the right touch for the RLD. On mine i have to roll forward and back a couple of times to get it to lock.

    Plans for a lift or tires in the future?
     
  5. Nov 29, 2008 at 9:49 AM
    #5
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

    Joined:
    Apr 27, 2007
    Member:
    #1432
    Messages:
    28,112
    Gender:
    Male
    First Name:
    Jamie
    Moncks Corner, SC
    Vehicle:
    09 Timberland Mica DC 4WD Sport
    wat?
    u can have an auto lsd and rear locker since the auto lsd is just brakes...nothing to do w/ gearing in the rear diff
     
  6. Nov 29, 2008 at 10:38 AM
    #6
    Janster

    Janster Old & Forgetful

    Joined:
    Mar 25, 2007
    Member:
    #1138
    Messages:
    14,256
    Gender:
    Female
    First Name:
    Jandy
    Lancaster, PA
    Vehicle:
    2016 GMC Canyon SLT w/ LineX and....
    The 05-08 trucks have the mechanical LSD which is inside the diff and is automatically engaged. The 05-08 trucks can't have both mechanical LSD and TRD E-locker.

    The 09 trucks have the Auto LSD which as jhodge already mentioned, uses braking system via sensors and the same system that the ABS functions from. The 09 trucks can have both Auto LSD and the E-locker.
     
  7. Nov 29, 2008 at 11:22 AM
    #7
    sonjay

    sonjay Well-Known Member

    Joined:
    Oct 9, 2008
    Member:
    #9834
    Messages:
    699
    Gender:
    Male
    I have just an LSD and using the brakes makes it work alot better IMO!
     
  8. Nov 29, 2008 at 11:26 AM
    #8
    jftaco

    jftaco [OP] Member

    Joined:
    Nov 29, 2008
    Member:
    #11120
    Messages:
    17
    Gender:
    Male
    Northern California
    Vehicle:
    09 PreRunner Off Road Pkg
    Janster hit the nail on the head. The '09s now offer both A-LSD and locking rear diff.
     
  9. Nov 29, 2008 at 2:01 PM
    #9
    TengoTaco

    TengoTaco Wish i was wheelin

    Joined:
    May 26, 2008
    Member:
    #6892
    Messages:
    613
    Gender:
    Male
    First Name:
    Tyler
    San Diego, CA
    Vehicle:
    2001 TRD stock
    None
    Thanks for the clarification! There are a lot of great upgrades on the 09's.
     
  10. Nov 29, 2008 at 2:08 PM
    #10
    linkfeeney

    linkfeeney Well-Known Member

    Joined:
    Dec 5, 2006
    Member:
    #393
    Messages:
    1,564
    Gender:
    Male
    First Name:
    link the stink!
    aberdeen, nj
    Vehicle:
    09 Doublecab TRD Off-Road! Magnetic Grey!
    the 09 is so much better than the previous yrs... now i wondering what 2010 is going to bring.... I'm think it will not be much, until the re-design comes up like 2012 or like 2013
     
  11. Nov 29, 2008 at 4:47 PM
    #11
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

    Joined:
    Apr 27, 2007
    Member:
    #1432
    Messages:
    28,112
    Gender:
    Male
    First Name:
    Jamie
    Moncks Corner, SC
    Vehicle:
    09 Timberland Mica DC 4WD Sport
    wat?
    my insurance wet down on my 4x4 09 vs my 4x2 07 w/ the same options and all b/c of all the added safety features
     
  12. Nov 29, 2008 at 5:00 PM
    #12
    jftaco

    jftaco [OP] Member

    Joined:
    Nov 29, 2008
    Member:
    #11120
    Messages:
    17
    Gender:
    Male
    Northern California
    Vehicle:
    09 PreRunner Off Road Pkg
    Yeah, the 'STAR' system is a nice touch for the 09's. Too bad I'm struggling with getting that darn rear locking differential to engage with any degree of consistency. Not that I 'need' it right now... I'm just trying to get comfortable when operating the features if/when I DO need them.

    The manual simply states to 'stop the wheels' and then push the button. The RDL indicator should blink for a few seconds and then stay lit/solid. It doesn't suggest that you need to be in any particular gear or go forward a bit, then backward a bit, then press it. It just says to press it; end of story. That, my friends, is bogus.

    I can't get it to engage consistently, and I'm thinking about taking it back to the dealer and having him tell me what I might be 'doing wrong', else admit a problem and get it fixed.
     
  13. Nov 30, 2008 at 11:58 AM
    #13
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

    Joined:
    Apr 27, 2007
    Member:
    #1432
    Messages:
    28,112
    Gender:
    Male
    First Name:
    Jamie
    Moncks Corner, SC
    Vehicle:
    09 Timberland Mica DC 4WD Sport
    wat?
    as long as its in 4LO and ur stopped, that should be all u need to do...then maybe rock it back and forth and turn the wheels while doing so to make the rear spin at different speeds
     
  14. Nov 30, 2008 at 11:26 PM
    #14
    wushaw

    wushaw Well-Known Member

    Joined:
    Jul 20, 2008
    Member:
    #8037
    Messages:
    99
    Texas
    Vehicle:
    08 AC TRD 4x4 6sp
    You gonna have to kinda jog it to lock, in other words move fwd or back sloooowly.
    Reason... if the cogs do not line up while at a complete stop then you have to line them up.
     
  15. Dec 3, 2008 at 12:06 PM
    #15
    RCBS

    RCBS "Cause I'm mighty proud of that ragged old flag."

    Joined:
    Apr 9, 2008
    Member:
    #5845
    Messages:
    2,517
    Gender:
    Male
    Appalachia
    Vehicle:
    06 Main Runner OR
    damn safety nannies! glad i have none of that on mine. i'm confident my driving skills on & off road will be enough to keep me "safe". don't like the vehicle making decisions for me. now if they come out with a button that turns off Old Ladies and Drunk Drivers, i'll sign right up for that. :)
     
  16. Dec 3, 2008 at 12:09 PM
    #16
    Krazie Sj

    Krazie Sj Resident Jackass

    Joined:
    Oct 9, 2008
    Member:
    #9849
    Messages:
    13,686
    Gender:
    Male
    First Name:
    Power Serge
    LV-426 (Acheron)
    Vehicle:
    07 TRD Off Road 4x4
    Borla Catback Exhaust, Airaid Short Ram Intake, 285x75R16 Mickey Thompson MTZs, 16" Konig Countersteer rims, ARB Bumper, All Pro LT w/Walker Evan Shocks front and back, All Pro expedition leaf pack, 10,000lb Superwinch, Intake Manifold Spacer, Bed Rack with ARB RTT, Rotopack and Hi Lift mounted, Husky Liner mats and an air freshener from 1995.
    Old Ladies are worth 1000 points. Why would you want to turn them off? Then you could only get the high score via paraplegic midgets in a gurney. They're worth 2500 points.
     
  17. Dec 3, 2008 at 12:29 PM
    #17
    norcalbb11

    norcalbb11 Nor*Cal

    Joined:
    May 20, 2008
    Member:
    #6753
    Messages:
    1,078
    Gender:
    Male
    Cali
    Vehicle:
    09 Taco Sport 4x4
    flowmaster 40 series, tinted windows, airaid CAI, removed 2nd filter, aries black bull bar
    you can turn the lsd off, press the lsd button then it will say auto lsd then press and hold it again and it will turn the lsd off and boy is that fun haha
     
  18. Dec 3, 2008 at 1:31 PM
    #18
    311offroad

    311offroad Stock Taco For Now

    Joined:
    Sep 11, 2008
    Member:
    #9161
    Messages:
    1,283
    Gender:
    Male
    Milledgeville, GA
    Vehicle:
    2005 TRD OffRoad SR5 4x4 Short Bed Debadged
    20% tint, Debadged, Pioneer AVIC-Z110BT, Infinity component door speakers, MagLite mod
    I wish I had LSD

    I at least wish I had the capability of locking the diff anytime. I know theres a mod for it but dont know if I want to mess with the wiring.
     
  19. Jan 14, 2009 at 6:49 PM
    #19
    fletch aka

    fletch aka www.BeLikeBrit.org

    Joined:
    Jan 4, 2009
    Member:
    #12223
    Messages:
    7,103
    Gender:
    Male
    First Name:
    Gary
    Left Coast
    Vehicle:
    09 Magnetic Gray TRD OffRoad
    TRD cat back exhaust, TRD Cold Air Intake, differential breather mod' Hellwig rear sway bar, 16x8 TRD Ivan Stewart's, Michelin LTX A/T2, DTRL Stealth Mode Mod, custom "Texas Edition" shift knob, Sock's "Classic" bedside decals, MetalMiller custom grill emblem, 20% front tinted windows, tinted taillights, Viper alarm, ScanGauge II, Flyzeye Designs V2W Tacoma Interior LED lighting, de-mud flapped, de-badged, extra D-rings under bed bolts, WeatherTech ED floor mats, G4 Elite Fold a Cover ,Toyota bed mat, tailgate theft deterrent device and absolutely no plasti-dip!
    Hi everyone, first post.
    I just picked up a 2009 Tacoma TRD OffRoad. It appears to have the usual problems I have read about on the Toyota forums, V6 click/ticking and stereo sub problems, other than that love the truck. I have been driving a Volvo station wagon for the last 25 years, not use to people checking out my ride.
    I need someone to explain the auto limited slip and locking rear differential to me. When and how would I use these and why does the manual make it sound like the truck will spin out of control if I turn these on.
     
  20. Jan 14, 2009 at 6:54 PM
    #20
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

    Joined:
    Apr 27, 2007
    Member:
    #1432
    Messages:
    28,112
    Gender:
    Male
    First Name:
    Jamie
    Moncks Corner, SC
    Vehicle:
    09 Timberland Mica DC 4WD Sport
    wat?
    the auto lsd kicks in when one of the rear wheels starts to lose traction. it uses brakes to try to give power to the tire that is on the ground.

    the locker is manually activated to put the same amout of power to both rear wheels.
     
To Top