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LSD Problem, maybe. Someone Diagnose what's going on!

Discussion in 'Technical Chat' started by 28ØØ3, May 5, 2010.

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  1. May 6, 2010 at 8:40 AM
    #21
    Asgard

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    Asgard Well-Known Member

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    Asgard, May 6, 2010
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  2. May 6, 2010 at 8:46 AM
    #22
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    28ØØ3, May 6, 2010
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  3. May 6, 2010 at 8:48 AM
    #23
    DeeKay21

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    DeeKay21 Lieutenant Dan.

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    DeeKay21, May 6, 2010
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  4. May 8, 2010 at 6:47 PM
    #24
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    To eliminate all possible sources of error, I replaced this Rear Diff Fluid.
    Tried new oil, 3 qts. of 80w-90 Castrol Dino Oil + 4oz of Champion brand LSD additive
    new vs. old oil, after ~2k miles since change:
    IMG_5366_2d6f52ba908c1b9136e24eb123e5e068daed7c6b.jpg
    1. Went to mall parking lot, did many, many figure 8s.....diff made no noise.
    2. After driving around after that, sometimes diff would make "whump, whump" sound, sometimes it would not :notsure:
    3. at this point, i'm done worrying about it. if the diff explodes, its under warranty and i did the recommended maintenance so there should be no liability on my part.
    4. last thoughts: a) maybe the clutch packs in the diff are still working out the old and working in the new b) eh, fuck it.

    i hope this thread at least helped someone else
     
    28ØØ3, May 8, 2010
    #24
  5. May 8, 2010 at 7:01 PM
    #25
    carmellocafe

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    carmellocafe Begin With The End In Mind.

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    Mine did this for awhile too. At first, I thought it might be a bearing problem in the front. :eek: I put in Valvoline Dino
    $29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
    75w-90 and only 4 ounces of "Trans-X additive. After about 9k miles it doesn't seem to do it anymore. I wonder if it's because some of us are putting in 75w90 instead of the 80w-90 that every manual I've looked at calls for in this diff? :confused:
     
    carmellocafe, May 8, 2010
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  6. May 8, 2010 at 7:37 PM
    #26
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    my manual explicitely states
    $29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
    75w-90
    maybe its just the valvoline, that's what i put in the 1st time
    or maybe its the trans-x
    dunno
     
    28ØØ3, May 8, 2010
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  7. May 8, 2010 at 7:46 PM
    #27
    carmellocafe

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    carmellocafe Begin With The End In Mind.

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    Hmm, I see that in the "FSM" it states 80w-90 0r straight 90 for the rear on an '06. Oh well, I don't think the 75 is hurting it anyways.
     
    carmellocafe, May 8, 2010
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  8. May 8, 2010 at 7:48 PM
    #28
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    regardless, i switched to 80w-90
     
    28ØØ3, May 8, 2010
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  9. May 8, 2010 at 7:56 PM
    #29
    Asgard

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    Asgard Well-Known Member

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    That's strange, so are you saying we have different manuals ? Just to make things clear here is mine :

    utf-8BSU1HMDAwNTEtMjAxMDA1MDgtMjE0N_443b9d67507a8c3fd5ffe9fbd5fc3ccb13c71c9d.jpg

    And page 398 shows what type of oil to use in the front and rear diff :

    utf-8BSU1HMDAwNTItMjAxMDA1MDgtMjE0O_80f21358203959c029a1fbc8cd70a9fd49f156a6.jpg
     
    Asgard, May 8, 2010
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  10. May 8, 2010 at 11:59 PM
    #30
    Peru

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    Peru Well-Known Member

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    [​IMG]

    there is an appriciable difference Between 75 and 80 it's half the ISO viscocity. The ISO viscocity is what really dictates how thin the oil is. Too thin = less of a film to keep metal from metal contact. When that film of oil breakes then there is metal to metal contact = not good. Once the oil comes up to temp then The 90 kicks in and both are the same.

    I would go with 80-90 and not 75-90 unless someone has info that states otherwise
     
    Peru, May 8, 2010
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  11. May 9, 2010 at 8:25 AM
    #31
    carmellocafe

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    carmellocafe Begin With The End In Mind.

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    Yes, in fact we are looking at two different manuals: The one you posted is an "Owners manual." The one I've been looking at is a "Factory Service Manual" found here--http://www.ncttora.com/fsm/05+/data/ileaf/06toyrm/06toypdf/06rmsrc/rm2006ta/002033.pdf

    Either way, they both clearly state for the rear the recommended oil is "SAE 80W-90." My concern is that if I switch to an 80W oil, I may gain a little protection, but probably suffer in gas mileage (IDK how much). Does anyone think that we get those groans in the rear because we've been using the 75W?
     
    carmellocafe, May 9, 2010
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  12. May 10, 2010 at 6:17 AM
    #32
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    Fuck it, the noise is getting worse so I took it to the dealership. I had the tech ride with me and he heard and felt the noise too.
     
    28ØØ3, May 10, 2010
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  13. May 10, 2010 at 6:58 AM
    #33
    DeeKay21

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    I'm curios to find this out too.:cool: I could have sworn my manual and others on TW said to use
    $29 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
    75W-90 all the way around and that I should be good.:rolleyes: I am going to be changing the front and rear here pretty soon since the weathers been getting nicer.

    So what was the outcome?
     
    DeeKay21, May 10, 2010
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  14. May 10, 2010 at 7:00 AM
    #34
    28ØØ3

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    28ØØ3 [OP] Well-Known Member

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    i'll let you know when they call me
     
    28ØØ3, May 10, 2010
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  15. May 10, 2010 at 7:08 AM
    #35
    DeeKay21

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    DeeKay21 Lieutenant Dan.

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    DeeKay21, May 10, 2010
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  16. May 10, 2010 at 7:17 AM
    #36
    28ØØ3

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    28ØØ3, May 10, 2010
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  17. May 10, 2010 at 7:23 AM
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    Crusher 2

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    I had the same symptoms on my 06 just after the 30k service. Tech at another dealer noticed that the LSD additive was not on the invoice from the original servicing shop. Drained out a bit of oil and added the Toyota LSD and "whump, whump, whump" went away. Mine was especially noticeable when backing out to the right and pulling forward to the left from a parking space.
    Crusher 2
     
    Crusher 2, May 10, 2010
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  18. May 10, 2010 at 7:23 AM
    #38
    DeeKay21

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    DeeKay21 Lieutenant Dan.

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    DeeKay21, May 10, 2010
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  19. May 10, 2010 at 7:24 AM
    #39
    DeeKay21

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    DeeKay21 Lieutenant Dan.

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    What grade weight of oil did you use?
     
    DeeKay21, May 10, 2010
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  20. May 10, 2010 at 4:07 PM
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    Crusher 2

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    Crusher 2 Well-Known Member

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    Not sure. It was not detailed on the stealership invoice.
     
    Crusher 2, May 10, 2010
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