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Rear end questions

Discussion in '4 Cylinder' started by 0uTkAsT, Apr 19, 2011.

  1. Apr 19, 2011 at 9:42 PM
    #1
    0uTkAsT

    0uTkAsT [OP] Gun Toting Gearhead

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    Hey all, still kinda new to Tacomas and I'm wondering if the LSD from an 05+ TRD Sport is able to be swapped in to a 06 non-TRD truck without changing out other parts? i.e. is the differential itself the only difference or are the housings, axles/splines, etc. specific to one rear end or another?

    Also, what kind of LSD do the TRD Sports have (i.e. are they electronically actuated or are they a simple cone or clutch type, etc), and what gear ratio are they (or does it depend)? My 4X4 2.7L 6-lug 5-speed is 4.10 geared, so the TRD would have to be the same for this to work.

    If there's any variables to be considered between differentials, what can I look for and where to find the info I need?

    Thanks so much for the help guys!

    (FWIW I'm trying to find a totaled TRD Sport to steal the rear diff out of for a cheap LSD upgrade)
     
  2. Apr 19, 2011 at 9:48 PM
    #2
    whippersnapper02

    whippersnapper02 Well-Known Member

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    05 to 08 Sports and some SR5s have a clutch type mechanical LSD. All 09 and up trucks use ALSD which uses the brakes to simulate a LSD. The stock mechanical LSD is very expensive and very hard to find. Not sure if it will even fit your axle.
     
  3. Apr 19, 2011 at 9:50 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    It will fit.
     
  4. Apr 19, 2011 at 9:52 PM
    #4
    mountainwolfpup

    mountainwolfpup Living the dream !!!

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    Your idea should work.

    Not sure on the gearing but believe it is 4.10:1 (of course the effective ratio would depend on your tire size also).

    The LSD is electronically controlled.

    Strike that. I was thinking of the full locker rear dif on the TRD package, which is electronic. No idea on the LSD? The full locker is the real deal!
     
  5. Apr 19, 2011 at 9:54 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    The LS Diff is a mechanical type on the 05-08 trucks, Dwight. He's talking about the TRD SPorts, not the TRD Off Road that has the E locker. And as far as gearing goes, he can swap his Ring gear onto the LS carrier with no issues. :)
     
  6. Apr 19, 2011 at 10:00 PM
    #6
    mountainwolfpup

    mountainwolfpup Living the dream !!!

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    Ahh yes Chris. Thanks. You are correct. I was thinking of the full locker on the TRD Off-road. Duh.
     
  7. Apr 19, 2011 at 10:04 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    ;)
     
  8. Apr 19, 2011 at 10:08 PM
    #8
    A7XTaco

    A7XTaco Member

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    I was told by the dealer that 4cyl diffs have a different axle spline count from the v6 diffs.
     
  9. Apr 19, 2011 at 10:08 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    Many dealers have no idea what the Auto LS Diff is either. Everything I have read says the LS Diff fits the 8.4" housing. No mention of engine size.
     
  10. Apr 19, 2011 at 10:13 PM
    #10
    A7XTaco

    A7XTaco Member

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    True...

    I just say that because when I had my 4cyl I was looking into finding a true LSD third member. I talked to my parts guy (life long off roader) and he immediately told me I would have to swap the axles also.

    He looked it up on the computer and showed me that 4cyls use a lower count spline on their axles (I don't remember the spline counts).
     
  11. Apr 19, 2011 at 10:26 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Thats true for the 5 lug Tacomas, but IIRC, all the 8.4's are the same.
     
  12. Apr 19, 2011 at 10:30 PM
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    A7XTaco

    A7XTaco Member

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    You know, I bet your right... I bet he was thinking 5 lug.

    Who dare question chris4x4? :D
     
  13. Apr 20, 2011 at 9:56 AM
    #13
    PSJ

    PSJ Prerunners Work

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    If your looking for more traction from a LSD swap, it would be easier to just drop in a ARB locker I would think. Not sure the difference in price to get the parts needed and installation costs for the LSD vs just dropping in an ARB Locker, but you would have arguably a larger and stronger rear end then the E-locker, with way more traction then the LSD will ever offer. :cool:
     
  14. Apr 20, 2011 at 6:06 PM
    #14
    0uTkAsT

    0uTkAsT [OP] Gun Toting Gearhead

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    You guys are awesome, thanks for the info!
     
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