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A-TRAC/TRAC/AUTO LSD Explained (Easy to understand, I hope!)

Discussion in 'Technical Chat' started by David K, Jan 19, 2010.

  1. Feb 16, 2015 at 10:54 PM
    #1281
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    The 6' bed is the standard bed , seeing how all Tacoma models except the DCSB have it
     
  2. Feb 16, 2015 at 11:01 PM
    #1282
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    Yes , exactly , the 6' bed length is the standard bed length on Tacomas , the double cabs with 5' beds are called " short beds " . There is no shorter bed on any Tacoma .
     
  3. Feb 17, 2015 at 6:09 AM
    #1283
    dogboy

    dogboy Active Member

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    I have really enjoyed reading the posts by the two of you as I've researched these traction control systems on here. Two invaluable contributors, that seem to say the same thing in different ways, that allowed me to finally sorta figure the systems out.

    I sure do wish that at least A-TRAC was available on the DCLB, or DCS(tandard)B, however you want to term it (the 6' bed). I think I already said that, though, at least once. I probably will never need it, because I don't do extreme wheeling. But it would be better to have and not need, than need and not have.
     
  4. Feb 17, 2015 at 7:48 AM
    #1284
    js312

    js312 Well-Known Member

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    Double-cab options from the Toyota website. The DCLB 4x4 is cut off to the right, but you get the idea:

    shortbed-longbed.jpg
     
  5. Feb 17, 2015 at 7:53 AM
    #1285
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    Short Bed

    There it is
     
  6. Feb 17, 2015 at 7:58 AM
    #1286
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    David has done a very good job of explaining the traction systems

    Toyota should offer the locker and ATRAC systems as an option on all configurations , maybe in the 3rd gen
     
  7. Feb 17, 2015 at 9:36 AM
    #1287
    David K

    David K [OP] Well-Known Member

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    As I said, nothing in my purchase paper or window sticker says 'short bed'... as the 5 ft. bed on a double cab is the normal (standard) bed length. The option is a 6 ft. bed on non-off road double cabs, and it is called 'Long Bed' but only on double cabs, since 6 ft. is a normal bed in all other Tacomas.
     
  8. Feb 17, 2015 at 9:37 AM
    #1288
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    Glad we agree that the 6' bed on Tacoma's is the normal bed
     
  9. Feb 17, 2015 at 9:39 AM
    #1289
    David K

    David K [OP] Well-Known Member

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    Yes, on all Tacomas except double cabs where (only) it is a long bed. :D
     
  10. Feb 17, 2015 at 11:02 AM
    #1290
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    Having the mutant bed on a DCSB does make sense for keeping the wheelbase the same as an AC , but I would suggest it is as much to do with having the driveshaft length the same for a manual transmission as it is to limit the length of the double cab . The 2nd gen TRD Offroad model was most likely designed around the AC platform with it's Tacoma standard 6' bed , and then the engineers tried to figure out how to squish s DC cab onto that frame , the only place to reduce is the bed length . If they really wanted to make the ultimate TRD Offroad based on wheelbase alone they would do a Regular Cab version .

    Having said all that , it's too bad Toyota doesn't offer the Offroad features like a locker and ATRAC on the DCLB , as this would expand the purchaser's options .
     
  11. Feb 17, 2015 at 1:30 PM
    #1291
    fatman

    fatman Member

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    sorry if this is a stupid question, total tacoma newb (I don't have one yet.)
    What limited slip function (if any) is available in a 2wd model? (not a 4x4) I currently have a 2wd ranger with an open diff and it drives me insane. wondering if a 2wd Tacoma 2005+ has an LSD and later an ATRAC option? or if the cool stuff is only for the 4x4s... looking on the site it appears the 'locking rear' is only an option on the 4x4.
     
  12. Feb 17, 2015 at 3:44 PM
    #1292
    David K

    David K [OP] Well-Known Member

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    all 2009+ Tacomas (2WD):

    1) TRAC (limited slip traction control provided via the ABS brake system and engine regulation aka throttle control) is the standard mode you are in automatically.

    2) AUTO LSD/TRAC OFF (limited slip traction control as above, but there is no engine regulation, brakes only for more power to move you ahead).
    Activate with a quick push of the VSC button moving or stopped.

    3) REAR LOCKING DIFFERENTIAL (only on the Off Road TRD Tacomas).

    As said above, there was a brief flirtation with mechanical limited slip differentials in 2005-2008 Sport TRD Tacomas and some others.

    Not sure why Toyota dropped that feature? Replacing brake pads is cheap and easy compared to rebuilding differentials for the LSD clutch pads.
     
  13. Aug 10, 2015 at 10:31 AM
    #1293
    Dagosa

    Dagosa Well-Known Member

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    As a long time winter driver and off roader and owner of a a Tacoma with the of road package; a locking rear differential is of limited value off road when you have trac and Atrac and almost no value in winter conditons with ice and snow. Having a locker seems to impress a lot of people but to be blunt, I never missed it with the Atrac on my previous 4 Runner. A rear locker is just a temporary max traction get out of jail free move and only useful for longer intervals up continuous steep terrain to avoid over heating brakes.
     
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  14. Aug 10, 2015 at 10:46 AM
    #1294
    David K

    David K [OP] Well-Known Member

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    I predict the locker will go the way of the dinosaur once we are are all on board the A-TRAC train. When I traded my '05 Off Road 4x4 for the 2010, I had not heard about the traction systems. I ordered another Off Road simply because it has a rear locker. Until everyone understands how A-TRAC works, I think the locker will remain available. Once everyone knows that A-TRAC give more traction (as it works on the front and back tires) than the rear locker, you may see it gone?

    I have only engaged the locker (with A-TRAC always on on L4) when I had to pull stuck 2WD Tacomas, and in snow (to not cut the throttle above 3 mph). I may have pulled them without the rear locked, I don't know? Generally you only want to get it right the first time! LOL

    I guess in an ideal off road world, we would have front and rear lockers as well as A-TRAC for all the choices. However, actual need/ use and cost would be reasons not to. That the A-TRAC doesn't compromise steering and the lockers do has me think A-TRAC will replace lockers on a safety basis alone. Just one yeh-hoo going over a cliff locked and then suing Toyota is all it will take!
     
  15. Jan 10, 2016 at 11:32 AM
    #1295
    eldedo

    eldedo voted most likely eaten by a bear

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    so these definitions would apply to the 2016? Would atrac/trac be mts in the 2016. Just trying to understand all of this, ie my first 4wd vehicle and toyota didn't make it terribly "simple", as for crawl control.......don't think I will ever use it, I'm kind of a control freak on some things.
     
  16. Jan 10, 2016 at 11:46 AM
    #1296
    IPNPULZ

    IPNPULZ Well-Known Member

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    Awesome!!
     
  17. Jan 29, 2016 at 9:43 AM
    #1297
    eternus

    eternus Well-Known Member

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    A-Trac comes with the Manual Transmission TRD Off Road and will honor all of the stuff laid out in this post. The Multi Select feature is brand new (to Tacoma) this year and will need to be added as further options to know about. If you have the 2016 TRD Off Road you'll need to learn the new nob setting for specific conditions, though it is ultimately using the A-Trac functionality to accomplish your needs in each specific application.

    That being said, I'm not sure what is added into the mix to make it better in sand or when doing a super steep ascent/descent and how you'd get the same results with A-Trac.

    I'd love to see some example videos or descriptive posts of people using the "old" tech to accomplish the same thing the "new" tech promises, the "getting unstock after being buried in sand" videos that seem to be everywhere when you search for "Multi Select Tacoma."
     
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  18. Jan 30, 2016 at 6:57 PM
    #1298
    angry john

    angry john Well-Known Member

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    I just picked up my brand new truck today. I had the guy check the u-bolt and grease the joints and check the transmission as that was my focus while at the dealer. I get home and cannot find an A-trac button and when in 4 low its says trac off. I have the 16 off road with a auto trans so do i not have A-trac or is there a way to not have it on an offroad version??? Does this also mean that i should be looking at doing the yellow wire mod???
     
  19. Jan 30, 2016 at 7:57 PM
    #1299
    Metalnut

    Metalnut In My Kingdom Cold

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    Calm down, all is well, you have A-TRAC, it's just that in the 3rd gen they call it MTS. See the button and the big round multi-position knob on the roof above your head? That's MTS, that's your A-TRAC. Same idea. And yes, in 4L you have no TRAC (traction control), that is by design. And for the love of all that is holy, don't go cutting any wires :)

    Let me re-paste the @David K cheat sheet that has been created for 2nd gen, it's basically the same thing for 3rd gen (I need to verify some 4L settings, but it should be identical):

    Press Nothing...

    H2= TRAC (Limited Slip with Engine Output Regulation)
    H4= TRAC (Limited Slip with Engine Output Regulation, front and rear)
    L4= No Traction Control
    ---------------------------------------------------------------------------------------
    Quick Press (VSC OFF SWITCH) moving or stopped...

    H2= AUTO LSD (Limited Slip without Engine Output Regulation, VSC OFF to 30 mph)
    H4= TRAC OFF (Limited Slip without Engine Output Regulation)
    ---------------------------------------------------------------------------------------
    Press and Hold In 3-5 seconds (VSC OFF SWITCH) while stopped...
    H2= VSC OFF (No Traction Control)
    H4= VSC OFF (No Traction Control)
    ---------------------------------------------------------------------------------------
    Off Road TRD:

    Quick Press of RR Lock Switch = Rear differential Locker (L4 only on 4WD models)
    L4 Only: Quick Press of A-TRAC Switch = Front and Rear near-no slip traction control. A-TRAC works the front below 3 mph when the Rear Locker is also on.
    ==========================================================================

    What should you use?
    Standard Mode until you lose traction, then quickly press the VSC OFF button to increase the power of your traction control (more engine RPM, stronger braking on the spinning tires).

    In L4 (Low Range) and your tires spin, press the A-TRAC button (Off Road TRD only) to nearly lock-up any spin. I always have A-TRAC on in L4... unless you need to spin the mud out of the tires.

    Emergency stuck if A-TRAC doesn't work in any situation, press the RR Lock button (works with or without A-TRAC working on the front tires). The rear locker connects both rear tires from inside the differential (0 spin). Turn off RR Locker, once you are unstuck.

    1) H2 TRAC
    2) H2 AUTO LSD (VSC OFF to 30 mph)
    3) H2 VSC OFF
    4) H4 TRAC
    5) H4 TRAC OFF
    6) H4 VSC OFF
    7) L4 VSC OFF
    8) L4 & A-TRAC
    9) L4 & Rear Locker
    10) L4 & Rear Locker & A-TRAC
     
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  20. Jan 30, 2016 at 8:09 PM
    #1300
    angry john

    angry john Well-Known Member

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    So it would seem that in 4L where i can lock the rear dif i have no traction control so i have an open front? This is the only reason i would worry about atrac. I plan on gong out to play soon i just saw in the book that came with my truck there is an a-trac button and i dont have one. So with the terrain select put to rock which is the most restrictive that would cover the front? Spent a lot of time studying this thread prior to getting my truck during the long wait so i have obviously not had a lot of time to play.
     
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