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Thread: Transfer case and DIFF oils

  1. #1
    Join Date
    Oct 2007
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    Transfer case and DIFF oils

    Hi all. My high km diffs and transfer case are showing wear. Centre diff is whining and rear diff is quite worn. Would I be better going to a 85w140 diff oil in both or stick with Penrite Pro Gear oil and add an additive or no additive?

    I will stick with the Penrite pro synthetic for the gear box but will add some Nulon smooth shift as 5th is a bit noisy.

    Cheers

  2. #2
    Join Date
    Apr 2008
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    Brisbane
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    We use Nulon G70 in the work vans that have diffs that whine,it works well.Vans seem to amplify any Diff noise,due to the vehicle shape,that is, a butter box on wheels with not much sound deadening.

    But if the Diff or G/B has noisey bearings,it won't stop the noise,but it may put off the inevitable rebuild a bit longer.
    paul

    D4 MY12 white,2.7(with a few more killer wasps) rear air,e diff,xenons,arb bar,7 seat ,18" bfg KO2

    2009 Defender 110 (son's)ARB
    bar,snorkle,rocksliders,rack,KM2's,BAS chip, always needs a wash

    '56 S1,been in the family since...'56

  3. #3
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    Thanks mate. I'm going to do Penrite 80w110 in my centre diff. I used straight Penrite 140 in the rear and a combo of 140 and 85w90 in the front diff. Should come up ok.

    Cheers

  4. #4
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    Apr 2011
    Location
    Windsor NSW
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    repco has right oil

    Hi, not being an expert re oils when my puma just had its rear diff bearings replaced by a leading Sydney diff specialist who does lots of Rover's rebuild work re warranty etc they said to use Castrol Axle LS an AD5W140 soec oil part no 3377666 available from Repco--a mineral oil as they said that the actual diff design is old so this better than synthetic ones re wear even though the synthetic one leaves everything shiny --but the mineral does a better job re protection--as said I am no expert but would trust a specialist diff and gearbox reconditioning expert.

  5. #5
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    Quote Originally Posted by alan48 View Post
    --but the mineral does a better job re protection--as said I am no expert but would trust a specialist diff and gearbox reconditioning expert.
    I wouldn't as most mechs know Jack **** when it comes to lubes.
    If you are using a mineral fluid, bring back your change interval to about half of the recommended mileage.

    There are some brilliant mineral based diff fluids that outperform almost any full syn fluid you could name, but they aren't common and they are from obscure (in Australia) blenders.

    Just be wary of people that make blanket statements.

  6. #6
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    Quote Originally Posted by rick130 View Post
    most mechs know Jack **** when it comes to lubes.


    Just be wary of people that make blanket statements.

    Blanket statement alert

  7. #7
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    Quote Originally Posted by discorevy View Post
    Blanket statement alert
    Hahaha, got me. Transfer case and DIFF oils

  8. #8
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    Apr 2008
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    And here is another blanket statement.....

    Using synthetic gearbox oils in our vans,cold shifting is not good.We have tried Nulon and Valvoline,same grade,as per specs.

    I asked the guy i know at the dealer.

    His answer was,put mineral in,and no problems,same grade,they use Valvoline.

    Whenever they use synthetic,usually as requested by the owner,they get complaints.

    The actual OEM oil is not available,but i recon it is synthetic as it has very long drainage intervals,200K.
    paul

    D4 MY12 white,2.7(with a few more killer wasps) rear air,e diff,xenons,arb bar,7 seat ,18" bfg KO2

    2009 Defender 110 (son's)ARB
    bar,snorkle,rocksliders,rack,KM2's,BAS chip, always needs a wash

    '56 S1,been in the family since...'56

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