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  1. jackaroo
    jackaroo is offline Tsikot Member Rank 3
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    November 29th, 2003 11:16 PM #1
    Question:
    If the LC has a rear lock diff switch on the panel, then is it safe to assume that it can't have a limited slip diff at the same time? Is it either one in use- LSD or rear locker- but never both?

    The service guys at Toyota recommend using LSD oil but don't think it has one. Does a lockable rear diff need LSD oil?
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  2. afrasay's Avatar
    afrasay
    afrasay is offline Tsikot Member Rank 5
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    November 30th, 2003 12:53 AM #2
    IMO, I don't think so. LSD contains clutch type materials that needs special oil to create friction effect. Locking diff, like in our Safaris uses ordinary gear oils.
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  3. mbt's Avatar
    mbt
    mbt is offline Editor In Chief
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    November 30th, 2003 01:19 AM #3
    usually it's either a locking diff or an open diff, but there are locking LSD units available, like the diff unit in the wrangler rubicon (locking LSDs are more common as center diffs).
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    pajerokid
    pajerokid is offline Bad Photographer
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    November 30th, 2003 11:47 AM #4
    I think it's an either/or thing.
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    ARB
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    November 30th, 2003 01:56 PM #5
    ARB lockers are either open or locked. But the new Electrac, is Limited when unlocked and locked when on.
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  6. jackaroo
    jackaroo is offline Tsikot Member Rank 3
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    November 30th, 2003 07:41 PM #6
    Thanks guys.
    Do you think using LSD gear oil would make a difference in longevity in an open or locking diff? Some say using a synthetic gear oil (like Mobilube SHC 75w90) would be better than a mineral LSD gear oil in such a case.
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  7. OTEP's Avatar
    OTEP
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    November 30th, 2003 11:36 PM #7
    If you weighed benefits vs. cost, you're still better off using conventional gear oil + LSD additive than fully synthetic.

    http://docotep.multiply.com/
    Need an Ambulance? We sell Zic Brand Oils and Lubricants. Please PM me.
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  8. ondoy
    ondoy is offline Verified Tsikot Member
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    December 5th, 2003 06:32 PM #8
    Judging from the description of this product, it appears that an LSD rear can co-exist with a rear diff Locker. Please check the following site .
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  9. jackaroo
    jackaroo is offline Tsikot Member Rank 3
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    December 5th, 2003 07:36 PM #9
    Interesting read. I wonder if it's compatible with the LSD of the local trooper.
    Thanks.
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  10. Drexx
    Drexx is offline Verified Tsikot Member
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    December 15th, 2003 08:17 PM #10

    15Dec2003 (UTC -8)

    Originally posted by jackaroo
    If the LC has a rear lock diff switch on the panel, then is it safe to assume that it can't have a limited slip diff at the same time? Is it either one in use- LSD or rear locker- but never both?
    Yes, if you have the fr/rr diff locker switch on the left side of dashboard, then yes, you have the locking fr/rr diffs.

    Another thing to check is a factory sticker like this:
    http://www.pbase.com/image/24025137
    See the alpha-numeric stuff for Trans/Axle ? That means transmission is A343 (4-speed auto) while the axle is an open diff with a 3.36 ring & pinion ratio. If the axle code said "A04" or something like that, then it's got locking diffs; or if the last number was a "3", then limited slip.

    The service guys at Toyota recommend using LSD oil but don't think it has one. Does a lockable rear diff need LSD oil?
    No. But LSD can help reduce some chattering noise (if you notice, that is), and can help your open diffs behave like a limited-slip diff somewhat as the oil turns viscous when there is a great speed difference between the left and right wheels. LSD oil is also pricier.
    Last edited by Drexx; December 15th, 2003 at 08:21 PM.
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LSD or Lockable rear diff?