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Thread: Disco 3/4 Automatic Transmission FAQ - 6 Speed

  1. #11
    Join Date
    Feb 2007
    Location
    Yass NSW
    Posts
    2,658
    Some more info, the link below has the recommended fluids ( I wonder how much Masarati fluid costs) and recommended change intervals.

    "ZF 5 and 6-speed as well as the ZF 4HP20 automatic transmissions are filled maintenance-free with specially developed partially
    synthetic ATF oils. Maintenance-free fills are intended for normal operating conditions. Especially driving at very high operating
    temperatures can result in accelerated aging or increased wear of ATF oils. It is recommended, in the event of severe operating
    conditions, such as:
    - frequent highway driving in top speed range,
    - offensive, sporty driving style,
    - frequent trailer operation,
    being above average, oil purification (oil change) on automatic transmissions is recommended between 80,000 km and 120,000 km, or
    8 years, depending on the load.
    In each case, only released ATF oil may be used for oil changes. And oil changes must be performed in accordance with the relevant
    specifications."

    http://www.zf.com.au/Tech%20Info/Lub...s/TE-ML_11.pdf

    Regards
    Tote
    Go home, your igloo is on fire....

  2. #12
    Join Date
    Nov 2009
    Location
    Melbourne
    Posts
    827
    Had the transmission done yesterday, metal sump kit - $300, 5.5 litres of Lifeguard oil - $197 - labour $254, they said the oil that came out was "very clean" (which is always nice to know) - before the "service" it ran pretty smooth but now it's very smooth indeed, so I'm very pleased with the way "Manuel Automatics" of Thomastown did the job, nice people to deal with - on time & courteous - explained all the work they had done - what more can you ask.
    cheers

  3. #13
    Join Date
    Jun 2006
    Location
    Heathcote Junction
    Posts
    781
    Old Salt

    I am in Fawkner so Thomastown is handy.

    Regards

    Chuck

  4. #14
    Join Date
    Jul 2007
    Location
    Albury
    Posts
    16
    Quote Originally Posted by Tote View Post
    There are reports from the UK of coolant contamination from the transmission cooler in the radiator becoming porous. It may be worthwhile to consider testing old fluid for glycol as a transmission flush will not help for long.
    A cab driver (Ford Fairlane) in Brisbane told me this happened to him. He also complained about the fact that it cost $9000 for a new 6 speed ZF when the old 4 speed Ford box could be had for $1400!

  5. #15
    Join Date
    May 2010
    Location
    NE Victoria
    Posts
    44
    Quote Originally Posted by WhiteD3 View Post
    I have to disagree, sorry My D3 has done 97k without a shudder or any other transmission issues. I've never towed anything so maybe this towing is a qualifier re the timing of the ATF change?
    I've just had my auto stripped down looking for a noise (preventative measure) they tell me it looked brand new and must have been off a low miledge rig. Have done 120k no towing until NOW. Didn't find the noise, new bearings while it was down.

    dj

  6. #16
    Join Date
    Jul 2010
    Location
    Terrigal sometimes, but mostly everywhere else
    Posts
    224
    All this talk is making feel nervous.

    Anyone recommend a ZF specialist near the NSW Central Coast.

    Will travel for right people as previous experiences tell me the coast has a higher than normal level of mechanically challenged people, no make that challenged at everything!

  7. #17
    Join Date
    Jul 2010
    Location
    Terrigal sometimes, but mostly everywhere else
    Posts
    224
    Thanks Tote for your information, now I understand a bit better.
    Mine is shuddering when existing a roundabout then disappears.
    So now I am in a dilema. Do I spend $700 on an auto service or do I spend $2200 on reconditioning the TC as they will have replace the oil in either instance? (my box was re'coed 50k ago).

    Thanks

  8. #18
    Join Date
    Jan 2010
    Location
    Edmonton Alberta Canada
    Posts
    744

    Perhaps ask the guys who did the reconditioning.

    Quote Originally Posted by gasman View Post
    So now I am in a dilemma. Do I spend $700 on an auto service or do I spend $2200 on reconditioning the TC as they will have replace the oil in either instance? (my box was re'coed 50k ago).
    Thanks
    I wondered if you know which shop did the reconditioning? If so, and if they would talk to you, perhaps they would answer that question for you.

    It could be that they remember the tranny, particularly if it was not so good. It all comes down to trust and luck. My guys when they changed the pan filter etc said based on what they found stuck on the pan magnets that the tranny was still OK but there was a bit more metal on the magnets than they would have liked to see for 126,000 km.

    Tranny rebuilds, like engine rebuilds, come down to a question of the parts you leave in and what you replace. Often that is decided by who is paying, not the guys doing the fixing. Me, in the absence of anything else, I would probably do another oil change, but make certain that the official Land Rover oil was used. The tranny will then either get better or get worse.

    The way to "quick fix" a tranny that is slipping is to add find metal powder to the oil - that reduces slip for awhile - at least until you are far away from the shop; hence new clean oil of the correct type will either solve the problem as it washes out stuff, (glazing), causing the problems or the problem becomes worse because the oil is attempting to do what it is supposed to do, and the parts are such that the oil cannot do its job of transmitting torque.

  9. #19
    Join Date
    Jun 2009
    Location
    mandurah
    Posts
    1,465
    Quote Originally Posted by bbyer View Post
    I wondered if you know which shop did the reconditioning? If so, and if they would talk to you, perhaps they would answer that question for you.

    It could be that they remember the tranny, particularly if it was not so good. It all comes down to trust and luck. My guys when they changed the pan filter etc said based on what they found stuck on the pan magnets that the tranny was still OK but there was a bit more metal on the magnets than they would have liked to see for 126,000 km.

    Tranny rebuilds, like engine rebuilds, come down to a question of the parts you leave in and what you replace. Often that is decided by who is paying, not the guys doing the fixing. Me, in the absence of anything else, I would probably do another oil change, but make certain that the official Land Rover oil was used. The tranny will then either get better or get worse.

    The way to "quick fix" a tranny that is slipping is to add find metal powder to the oil - that reduces slip for awhile - at least until you are far away from the shop; hence new clean oil of the correct type will either solve the problem as it washes out stuff, (glazing), causing the problems or the problem becomes worse because the oil is attempting to do what it is supposed to do, and the parts are such that the oil cannot do its job of transmitting torque.
    Hey what!! Most transmission manufacturers have quite sophisticated filtering systems to eliminate foreign material, particularly metal, from the fluid. I cannot see this being good for any transmission IMO.
    D4 2.7litre

  10. #20
    Join Date
    Jan 2010
    Location
    Edmonton Alberta Canada
    Posts
    744

    Fine metal powder "fixes" the client, not the tranny.

    Quote Originally Posted by ADMIRAL View Post
    Hey what!! Most transmission manufacturers have quite sophisticated filtering systems to eliminate foreign material, particularly metal, from the fluid. I cannot see this being good for any transmission IMO.
    You are correct, metal filings are bad for the transmission and that is one reason that ZF has put two magnets in the bottom of the plastic oil pan. I was surprised as to how many metal slivers and how much metal paste was clinging to the magnets when the plastic filter / pan combo was replaced in my ZF. The magnets were doing their job and provided an indication of the degree of operational wear within the transmission.

    As to purposely pouring metal filings in with the transmission oil, well this is equivalent to packing a rear differential with sawdust. The sawdust quiets the gears down for a time, long enough for a difficult client to depart; the metal filings increase the viscosity of the transmission oil such that the client can also depart. These "fixes" normally are a result of the vehicle owner blaming the shop for the mechanical problems.

    In the case of a transmission, often it is the dirty oil that has kept the vehicle at least mobile. In this case, the result of an oil change is that the vehicle cannot even back off the hoist. An unreasonable owner then blames the shop, insists the tranny was OK when the vehicle drove onto the hoist, claims the shop wrecked it so they better fix it - they do.

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