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[LS2] Fitting Diff cooler on stranded ve zf diff

Discussion in 'V8 Development and Modification' started by Shanessvredline, Nov 17, 2019.

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  1. Shanessvredline

    Shanessvredline Donating Member

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    I was actually thinking the same thing, I'll ask my diff specialist when I take it in for to get it changed out, the clutch packs are what failed in my last one and the spider gears followed, sound like someone let of both barrels of a 12 gauge when it finally gave out
     
  2. shane_3800

    shane_3800 Active Member

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    The LSD oil just has a friction modifier added which has no affect on the steel gears a trutrac being gear based will see no advatage or disadvantage using LSD oil it's just that the slightly lighter spec 85w-140 which is good for cars only comes in LSD 99% of the time or you can use the gluggy truck stuff.
     
  3. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    To quote from the Eaton Harrop user manual.

    Detroit TruetracHigh quality mineral or synthetic gear lubes are required for use in Detroit Truetrac differentials. Regardless of the lube type, always use a GL5 rated lube with the least amount of friction modifier. Mineral lubes lacking friction modifiers (limited-slip additives) were historically recommended for all Truetrac applications because friction modifiers can slightly reduce the bias ratio (limited-slip aggressiveness) of Truetrac differentials. However, to address the continually increasing power outputs of modern powertrains, many vehicle manufacturers have switched to synthetic lubricants as a counter measure for increased axle temperatures and prolonged service intervals. In general, consult the vehicle owner's manual for the manufacturer's recommendations for lubrication type, weight and fill volume. This will ensure lube compatibility with the seal materials and bearings

    https://www.harrop.com.au/shop/system/download/Eaton Owners Manual.PDF

    I have truetrac centres going into 2 different cars so bothered to read the manual for once...
     
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  4. Shanessvredline

    Shanessvredline Donating Member

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    Makes sense...
     
  5. shane_3800

    shane_3800 Active Member

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    Yea they are talking more about viscosity rather than the additives for LSD oils as friction modifiers are used in full syntectic oils. LSD additives objectives are to increase friction like when you make that corn starch slime and punch it, it doesn't stick to your hand. Thats sort of how LSD oil works than you have full syn non LSD oil with friction modifiers to get it to run like water but hold a GL5 grade. This is like the diff oil I used in my brothers falcon 75w-85 GL5 $110 for a 1l bottle and it's go better shear strength than a 80w-90 mineral oil. This is what I think Eaton is reffering to, not lim slip additives
     
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  6. Shanessvredline

    Shanessvredline Donating Member

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  7. Shanessvredline

    Shanessvredline Donating Member

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    Well I guess that sorts that question
     
  8. shane_3800

    shane_3800 Active Member

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    Yes they say use a mineral oil and not a syn but say LSD additives are not required but they don't say not to use them. This means if a good mineral diff oil comes pre packaged with the additive which most do in 85w-140 it's fine to use. Just don't use a heavily modified semi/full syn oil.
     
  9. losh1971

    losh1971 Well-Known Member

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    I know some of the later LSD Holden diffs that had the clutch pack required the proper Holden additive. Any other type of additive and those used in LSD oils were not suitable for some models.
     
  10. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    ??? Maybe just read that paragrapgh again from Harrop because they mention "lack of friction modifiers" and "least amount of friction modifier" and yet it says nothing about viscosity.

    And don't friction modifiers there to reduce friction? they reduce the chatter in cone/clutch type LSD units i.e they allow them to "slip" more smoothly.
     
  11. shane_3800

    shane_3800 Active Member

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    No friction modifiers are actually what they use in synthetic oils hence why I pointed it out.
     
  12. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Friction modifiers are used in both mineral and synthetic oils. Synthetic oils are used because the can withstand more heat before they break down and generally a longer service life.
     
  13. _R_J_K_

    _R_J_K_ Well-Known Member

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    I know/have seen a lot of high level purpose built drift/track cars and none of them have any kind of diff cooling outside of an diff cover that can expand fluid capacity and maybe add some cooling fins on it. I think you will see results from just changing the diff oil more regularly based on what you're actually using the diff for rather than trying to make the oil last longer, that and centre choice.
     

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