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Thread: Disco 4 Automatic Transmission FAQ - 8 Speed

  1. #21
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    Quote Originally Posted by DiscoJeffster View Post
    It is worth it to ensure it will last a very long time. It's good news you can't feel a difference as it shows the old fluid was still in good health. Now the new fluid will support it for another 60k km. I guess I'd only question whether it was worth it based on how long you intend to keep the vehicle. I'm not sure the fluid changes will translate directly into sale price later, but it will make it easier to sell.
    I think you're right on all counts there. I tend to over-service a bit but generally happy to look after things. Hard to say how long I'll keep it but I prefer to assume longer and maintain accordingly.
    Everything is easy when someone else is doing it
    MY14 SDV6 SE Corris Grey
    Compomotive 18s : D697s : Traxide DBS : LLAMS : ARB compressor : IC-450N
    Rhino Platform : GOE compressor, Tx & front bash plates, deluxe sliders

  2. #22
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    Availability of replacement

    I went to A & B Automotive with the Land Rover club. They are in Dandenong Melbourne. They rebuild Z F gearboxes for Australian manufacturers. They are fully approved by ZF hence they do the factory warranty re-builds. Their operation is pretty impressive - I think the vast majority of their work is on ZF gearboxes. They reckon the 8 speed is the best gearbox that's been made so far.

    I'm up to 50k now and I've towed 10k. When I went to the meeting at A&B in February, someone said that an 8 speed conversion gearbox sump was almost available - does anyone know if they are now available, and who from? I'd like to have that replaced when I get the gearbox serviced. At A&B, they test the gearbox, check the gearbox fluid for gearbox wear indicators, change all the fluids, etc etc. and there's no affect on warranty either. Not sure though what they charge for the gearbox fluid.

  3. #23
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    D4 8 speed shut down

    As I am a new LR owner, with a used Disco 4 & I am curious if others have experienced a similar chain of events.

    Travelling home along the M1 north to Newcastle towing a camper trailer, I experienced a sudden lack of acceleration with vehicle slowing down but able accelerate to 80-90 kph. No warning lights came on.
    As we were able to cruise with approx 50k to home, we cruised on to have a "HDC not available" warning pop up. (weird I thought as we were not in that mode) with only 10k to home & close to our exit we plodded on only to have a total shut down at the exit junction blocking traffic. (Now that's another story!)

    My limited knowledge thought maybe dicky turbo as this loss of acceleration had occurred before but reset after stopping and turning off.

    The embarrassment of a recover home and eventual trip to a non LR workshop has resulted in no clear conclusion apart from dirty over heated transmission oil & a recommendation to have another transmission service. (Vehicle serviced by LR Dealer 5k ago just before we purchased.)
    A number of error codes were down loaded:
    Engine Management

    • P2263 Turbo Boost Performance
    • P0700 Trans Control System (Malfunction lamp indicator)
    • U0101 Lost Comms with trans control module

    Transmission
    • P0702 TCS Electrical
    • P1707 Transfer Case Neutral indication Circuit
    • P1707 Transfer Case Neutral indication Circuit

    Anti Lock Brakes
    • U0101 Lost comms with Trans Control Module.
    • U0402 Invalid Data from TCM

    Waiting on dealer to call me back to discuss options.

    Thoughts anyone?

    `

  4. #24
    LRD414's Avatar
    LRD414 is offline Super Moderator Subscriber
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    Quote Originally Posted by l00kin4 View Post
    Had a partial flush (no pan replacement) on my ZF8 transmission by the dealer today.
    My car has travelled just under 65,000km and I had no issues with the transmission at all.
    Just a preventative maintenance task as I plan on keeping it for a while.
    I'd like to tell you I can notice an amazing newfound silky smoothness but so far I can't notice any difference at all.
    I did specifically ask them to keep some of the drained fluid to have a look at but they somehow forgot about that.
    So final cost for the partial flush was $285 labour plus 5l of ZF8 fluid @$95 - $495 all plus GST = Grand total $858
    I've posted this in another thread but I think it should be added here.
    Virtually the same reasoning and result as David's post:
    $800 / 4L of ZF8 / no change in performance / 77,000km and almost 3 years.
    The cost included around $95 for a new drain plug, which seems more excessive to me than the fluid or the labour.
    No clean container to keep any fluid (I'd say just didn't bother) but reported as clean looking.

    Regards,
    Scott
    D4 TDV6 MY14 with Llams, Tuffant Wheels, Traxide DBS, APT sliders & protection plates, Prospeed Winch Mount w/ Carbon 12K, Mitch Hitch & Drifta Drawers
    Link to my D4 Build Thread
    D3 2005 V8 Petrol
    Ex '77 RRC 2 door. Long gone but not forgotten.

  5. #25
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    Quote Originally Posted by LRD414 View Post
    I've posted this in another thread but I think it should be added here.
    Virtually the same reasoning and result as David's post:
    $800 / 4L of ZF8 / no change in performance / 77,000km and almost 3 years.
    The cost included around $95 for a new drain plug, which seems more excessive to me than the fluid or the labour.
    No clean container to keep any fluid (I'd say just didn't bother) but reported as clean looking.

    Regards,
    Scott
    Hi Scott,
    this prompted me to take another look at my invoice for this job and curiously no mention of and certainly no charge for a drain plug. Which is quite worrying given that the LR procedure clearly states that the plug should be discarded.. Coincidentally my car as at the dealer today for fluid replacement in the diffs and transfer case. I'll give them a call to check this.

    David
    Everything is easy when someone else is doing it
    MY14 SDV6 SE Corris Grey
    Compomotive 18s : D697s : Traxide DBS : LLAMS : ARB compressor : IC-450N
    Rhino Platform : GOE compressor, Tx & front bash plates, deluxe sliders

  6. #26
    Join Date
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    NSW
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    Overheating Transmission D4

    Interesting as I recently purchased a 2013 3.0L D4 with 103,000 Kms, which developed overheating issues even though serviced at JLR 2,000k previously. No fault codes present & no warnings displayed, after initial warning which disappeared after cooling period.
    After a shut down and burning the gearbox oil, I had the oil replaced and new filter fitted. on the next trip, overheating warning occurred at 105Km mark. Allowed cooling period to only have a shut down 5km further a when stationary at a junction.. JLR couldn't locate a fault code, so there was no solution.
    Located a LR specialised MECHANIC (not technician) who suggested possibly the transfer case oil should be checked & sure enough, it was black. This replaced & our next +100km gave a temp readout of 103°C
    Having seen the location & size of the trans oil cooler, I suspect that size maybe an issue as well as a more frequent oil change, especially if towing and or travelling outback. The location does not provide a great deal of airflow either, especially sitting behind a cover guard!
    Next run will be with a camper and a longer distance & we will be running temp readouts along the road to monitor & see if we need an additional cooler in the circuit.
    There is a temperature build up when stationary as the torque converter is stationary and not pumping oil, hence the temperature buildup. The shut downs all have occurred when stationary at lights or junctions waiting for clearing of traffic.

    Update

    I have monitored the GB oil temp now on 3 trips.
    1st trip was without towing camper, relatively cool day, after 107Km temp was 109°C
    2nd trip was with a camper trailer (1800kg GVM), relatively cool day (26-28°C ambient temp), after 102km journey temp was 124°C.
    Temp increase was as soon as we hit traffic coming off the M! travelling south into Sydney. We skirted around the northern Hills Area to gain a steady run.
    3rd trip was a return journey with the trailer, on a warmer day (24-32°C day). We travelled through from southern Sydney Metro area in traffic:
    1st temp warning was when ambient was 30°C. Rested for 20min to allow cooling to 119°C, but:-
    2nd -4th Temp warnings over a 30min period of resting & cooling allowed us to reach family for a greater cooling period.
    5-6th occurred after a a 45min rest and ambient had cooled to 22°C, but after 15km we were at 136°C and warnings again.
    Our final rest & cooling was for 52min at the M! northbound entry and ambient fell to 18°C and we finally had a run home of 45Km with GB temp sitting on an average 109°C.
    My observations are that while we have a reasonable air flow we are OK, but as soon as we hit Sydney traffic, the temperature climbs with little continuous air flow. Once over approx 120° threshold it appears as though there is little cooling effect to prevent temp build up.

    Now "why is this so?"
    Supposedly 3 tonne towing capacity & a 500Kg loading capacity allowing 200Kg tow ball weight.
    On all occasions we have had little extra weight apart from the camper, but we have had cooling issues when unloaded.
    We have an ARB bull bar, long range tank & wheel carrier fitted which increases the load but still 200Kg approx short.

    Any thoughts folks?
    I am resolved to having an extra GB cooler fitted to try & overcome the problem as travelling in the outback will have higher ambient temps.



  7. #27
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    Quote Originally Posted by Wojer View Post
    Interesting as I recently purchased a 2013 3.0L D4 with 103,000 Kms, which developed overheating issues even though serviced at JLR 2,000k previously. No fault codes present & no warnings displayed, after initial warning which disappeared after cooling period.
    After a shut down and burning the gearbox oil, I had the oil replaced and new filter fitted. on the next trip, overheating warning occurred at 105Km mark. Allowed cooling period to only have a shut down 5km further a when stationary at a junction.. JLR couldn't locate a fault code, so there was no solution.
    Located a LR specialised MECHANIC (not technician) who suggested possibly the transfer case oil should be checked & sure enough, it was black. This replaced & our next +100km gave a temp readout of 103°C
    Having seen the location & size of the trans oil cooler, I suspect that size maybe an issue as well as a more frequent oil change, especially if towing and or travelling outback. The location does not provide a great deal of airflow either, especially sitting behind a cover guard!
    Next run will be with a camper and a longer distance & we will be running temp readouts along the road to monitor & see if we need an additional cooler in the circuit.
    There is a temperature build up when stationary as the torque converter is stationary and not pumping oil, hence the temperature buildup. The shut downs all have occurred when stationary at lights or junctions waiting for clearing of traffic.

    Update

    I have monitored the GB oil temp now on 3 trips.
    1st trip was without towing camper, relatively cool day, after 107Km temp was 109°C
    2nd trip was with a camper trailer (1800kg GVM), relatively cool day (26-28°C ambient temp), after 102km journey temp was 124°C.
    Temp increase was as soon as we hit traffic coming off the M! travelling south into Sydney. We skirted around the northern Hills Area to gain a steady run.
    3rd trip was a return journey with the trailer, on a warmer day (24-32°C day). We travelled through from southern Sydney Metro area in traffic:
    1st temp warning was when ambient was 30°C. Rested for 20min to allow cooling to 119°C, but:-
    2nd -4th Temp warnings over a 30min period of resting & cooling allowed us to reach family for a greater cooling period.
    5-6th occurred after a a 45min rest and ambient had cooled to 22°C, but after 15km we were at 136°C and warnings again.
    Our final rest & cooling was for 52min at the M! northbound entry and ambient fell to 18°C and we finally had a run home of 45Km with GB temp sitting on an average 109°C.
    My observations are that while we have a reasonable air flow we are OK, but as soon as we hit Sydney traffic, the temperature climbs with little continuous air flow. Once over approx 120° threshold it appears as though there is little cooling effect to prevent temp build up.

    Now "why is this so?"
    Supposedly 3 tonne towing capacity & a 500Kg loading capacity allowing 200Kg tow ball weight.
    On all occasions we have had little extra weight apart from the camper, but we have had cooling issues when unloaded.
    We have an ARB bull bar, long range tank & wheel carrier fitted which increases the load but still 200Kg approx short.

    Any thoughts folks?
    I am resolved to having an extra GB cooler fitted to try & overcome the problem as travelling in the outback will have higher ambient temps.


    The trans oil cooler is not airflow dependant. It users a heat exchanger through the engines cooling system, so don't be put off by the relatively small size.
    Ensure the engines complete cooling system is in good order, though I suspect you've got other issues. Any previous history with cooling system problems/overheating?

    Keep us informed as to what you find.

  8. #28
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    Quote Originally Posted by Wojer View Post


    Any thoughts folks?
    I am resolved to having an extra GB cooler fitted to try & overcome the problem as travelling in the outback will have higher ambient temps.


    one thought...

    Worth fitting a couple of high CFM computer case fans to an additional cooler and rigging them to come on by default when the trailer cct is activated? might be enough air flow to prevent it going over 120 degrees?

  9. #29
    Join Date
    Aug 2011
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    Coober Pedy, South Australia
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    So I drove a 550 km trip today in warm conditions (up to 42°) with only a 10 minute break. Not towing, pretty easy running. You'll notice vehicle speed is 110 though interestingly enough, Speedo was at 116kph.
    Max trans temp reached 88° but typically stayed at 85.
    Max engine temp of 92.
    Max engine oil temp of 110 and stayed there.

    For your info.

    Cheers.

  10. #30
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    Service of 8 speed in Melbourne - A & B Automotive Remanufacturing

    G'day All,

    Too often all we hear about is bad experiences but I just wanted to relate a very positive experience I had getting my 8 speed serviced at A & B Automotive Remanufacturing
    (A & B Automatic Transmission Service | Repairs & Remanufacturing – AB Automatics)

    Geoff from A & B was very knowledgeable and transparent about the service process and the service was finished earlier than expected.

    I will definitely be back in another 75,000km / 3years to keep my 8 speed fighting fit.

    cheers
    RickO

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