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Thread: How much better is transmax z than dex III for ZF?

  1. 19th March 2014, 06:51 PM #11
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    Quote Originally Posted by lro11 View Post
    I ran transmax z years ago in my 94 defender and I run it now in my 95 tanami I was told that heat is the biggest killer of R380 boxes never had any problems with the oil or supply I will be putting some nulon in with it to try and fix 1st to 2nd changing

    Try Castrol Syntrans 75W-85, much better performance under high load/heat, but cold shifting will suffer a little.
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  2. 20th March 2014, 11:16 AM #12
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    Quote Originally Posted by rick130 View Post
    Try Castrol Syntrans 75W-85, much better performance under high load/heat, but cold shifting will suffer a little.
    Ummm. I think the OP was referring to auto trans (ZF), in which case Syntrans 75W85 would be a really bad thing to use...

    ----

    BTW, if you want to go to a synthetic gear oil for an R380 I would highly recommend "Syntrans B" as it was specifically designed to provide good cold shiftability on manual transmissions designed for ATF, whilst delivering improved protection. It was developed in Australia specifically for the T5 manual trans in the BA Falcon XR6 turbos (series 1) - a similar to LT77/R380 sized 'box taking a LOT more torque through it...

    http://www.tds.castrol.com.au/pdf%5C...956_200703.pdf

    Plus the R380s have an oil pump designed for nice, thin ATF and putting a heavy oil in there will not do it any favours. It has to pump it all through the cooler circuit as well, and gear oils at low temperatures are MUCH thicker than ATFs.

    Laycock overdrives (Volvo, MG, etc) would fail the pump if you ran a thick oil, I don't think that this would be much different.
    DiscoClax
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  3. 20th March 2014, 12:37 PM #13
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    Quote Originally Posted by DiscoClax View Post
    Ummm. I think the OP was referring to auto trans (ZF), in which case Syntrans 75W85 would be a really bad thing to use...

    ----

    BTW, if you want to go to a synthetic gear oil for an R380 I would highly recommend "Syntrans B" as it was specifically designed to provide good cold shiftability on manual transmissions designed for ATF, whilst delivering improved protection. It was developed in Australia specifically for the T5 manual trans in the BA Falcon XR6 turbos (series 1) - a similar to LT77/R380 sized 'box taking a LOT more torque through it...

    http://www.tds.castrol.com.au/pdf%5C...956_200703.pdf

    Plus the R380s have an oil pump designed for nice, thin ATF and putting a heavy oil in there will not do it any favours. It has to pump it all through the cooler circuit as well, and gear oils at low temperatures are MUCH thicker than ATFs.

    Laycock overdrives (Volvo, MG, etc) would fail the pump if you ran a thick oil, I don't think that this would be much different.

    lr011 mentioned his R380

    I'm well aware of Syntrans B, but IMO Syntrans 75W-85 is far better suited to the R380 in Australia, and Land Rover specify MTF85 which is quite a bit thicker than any ATF @ 100*C (10.5cSt IIRC)
    This fluid has been specified since around 1997, and supersedes the previously recommended ATF.
    Castrol Australia even recommend Syntrans 75W-85 in heavily worked R380's and have done since around 2000.

    Having played a fair bit with various MTF's, most R380's appear to prefer heavier fluids in Oz conditions, (although they can be a little idiosyncratic) particularly when an oil cooler isn't present.

    As for the oil pump, it doesn't care what viscosity the fluid is for most practical purposes in most Australian conditions, it's an entirely steel pump unlike the earlier Leyland 'boxes.

    Just a FWIW, I'm running Motul Gear 300 in mine and have done for a number of years, check the viscosity
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  4. 20th March 2014, 01:08 PM #14
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    OK, so if you have a T5 maybe go with my recommendations. If you have an LT77 or R380 maybe not so much...

    My mistake.... I thought the 'Rover 'boxes were designed for ATF, not gear oils.

    The T5s weren't really designed for the engine revs we subjected them to in the Falcons, so a thicker oil really baulked the shifts. Hence developing this unique formulation especially for it. Fun fact: the "B" in "Syntrans B" was named after "BTR" who were the local manufacturer of the T5 at the time.

    Yep, that Motul is pretty thick, esp when cold (105 cSt @ 40ºC). Typical ATFs are a third of that. Cold shift-ability must be bordering on bloody awful? I hope you don't live near the snow...?


    Anyway, I'd use either the normal Dex3 in the ZF 4HP22/24 or Castrol Transmax Z / Multivehicle if you want/need a synthetic. Top oil with great characteristics.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
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  5. 20th March 2014, 01:13 PM #15
    twr7cx
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    Quote Originally Posted by PhilipA View Post
    I wonder why the link to the Transmax Z data sheet on the Castrol site no longer works then.
    Rick 130 Have you got any contacts there as they have not responded to me.
    Regards Philip A
    Transmax Z is still available at various retailers here.

    The Product Datasheet is still available online at http://www.castrol.com/liveassets/bp...Transmax_Z.pdf

    And it's still listed on the Castrol website: Castrol Australia - Automatic Transmission Fluid
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  6. 20th March 2014, 06:24 PM #16
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    Quote Originally Posted by DiscoClax View Post

    Yep, that Motul is pretty thick, esp when cold (105 cSt @ 40ºC). Typical ATFs are a third of that. Cold shift-ability must be bordering on bloody awful? I hope you don't live near the snow...?
    Check the VI and plug some numbers into a viscosity index calculator.

    At 0°C Motul Gear 300 is thinner than Syntrans 75w-85 and a few other low viscocity MTF,'s.
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