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Thread: Disco 4 Automatic Transmission FAQ - 8 Speed

  1. #1
    Join Date
    Oct 2003
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    Disco 4 Automatic Transmission FAQ - 8 Speed

    The existing D 3/4 Automatic Transmission FAQ was created in the days of 6 speed transmissions in all.

    Through the life of that thread things have got more complicated with the introduction of the 8HP70 8 speed in late 2012.

    After some requests to split the thread - this new thread is where I will be moving all of the specific 8 speed posts.

    The flow from post to post of the first page is likely to be strange as each post has been pulled out of an existing thread. However the intention is that going forward the 6 speed and 8 speed versions will have their own threads.

    Where a single post mixes both 6 speed and 8 speed information (Or doesn't specify which box) - I've left it in the original thread.

    The original thread may still also be useful to 8 speed owners for information about where to buy pans and oil etc.



    I was a little surprised how few specific 8 speed posts there are - if you think I have missed one (or two), please report the post using the normal red and white triangle in the upper right and comment that it should have been moved to this thread and we'll sort it.

    I'll come back in a day or so and clean up this last comment.... otherwise i think it is all split for you.... I hope that makes it easier for those with 8 speed transmissions!
    Last edited by Bytemrk; 28th December 2016 at 10:08 PM.
    Mark

    Of all the things I've lost, I miss my mind the most

    2012 SDV6 SE D4 with some stuff...
    2003 D2a TD5...gone...
    2000 D2 V8...gone...

    https://bymark.photo/

  2. #2
    Join Date
    Jan 2015
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    Brighton, Vic
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    Quote Originally Posted by SteveT View Post
    ...
    Oh and the transmission changes much smoother and now don't get the delayed take off I was getting every now and then.
    Oh ... my 2014 D4 SD 8 speed has a delay on take off ... I thought it was an electronic delay to lower stress on the driveline (full bore acceleration from stationary would be maximum stress on the driveline IMO).

    But perhaps its something wrong?

  3. #3
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  4. #4
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    Jun 2016
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    The old country.
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    Quote Originally Posted by eddy View Post
    Thanks guys and it is great to see my guide down here.


  5. #5
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    Quote Originally Posted by Robbie UK View Post
    Thanks guys and it is great to see my guide down here.

    That's not the only guide that gets a wrap down here Robbie.
    For the 8 speed servicing, I've seen you recommend changing the fluid via partial flush (drain/fill) early and often.
    What's your thoughts on the filter and filter changing?

    Regards,
    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  6. #6
    Join Date
    Jun 2016
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    The old country.
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    Hi Scott,

    I didn't know that I had traveled this far - although someone already has my user name!

    If there is a mechanical issue with the box or a repair to the mechatronic then I would change the filter. If it is just an additional oil change then the filter can stay put. With regular oil changes I'd be happy to run with the original filter until 150,000 miles / 10 years. Outside of a big mechanical failure I have yet to see a degraded filter.

  7. #7
    Join Date
    Feb 2012
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    Darwin
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    456

    Disco 4 8 Speed Automatic Transmission FAQ

    Q1. Can the gearbox (8speed) be dropped without a body off job?
    I have reported a small weep originally up on the 2nd turbo. Drain pipe was removed, checked and cleaned. Now that area has remained dry, but a small oil weep is accumulating around the starter motor bottom mount bolt flange. They reported rear main seal, which is a body off job that I really don't want done unless absolutely positive of the source.
    I do have a small vibration through the steering wheel at 1800 & 3600rpm whilst under load at any speed which I reported. (Not evident in park/neutral) Maybe not related, but the previous post now opens up another possibility of this weep source. Maybe gearbox/torque convertor related? I noticed what looks like a blanking grommet on the underside of gearbox bell housing;
    Q2. Will I be able to see much in there with an inspection camera through this, if it is a blank?
    Cheers, Mungus.
    _________________
    MY14D4HSE, Nara Bronze, E-Diff, Vision Assist, Surround Cameras, LLAMS, ProSpeed Sliders/Compressor plate, Mitch Hitch,
    ARB Summit Bar, Runva 11XP, Traxide D3-DU, GOE Comp. Rims, D697 265/60R18, Rijidij RWC, Fyrlyts.

  8. #8
    Join Date
    Jan 2015
    Location
    Brighton, Vic
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    Whose best in Victoria for 8 speeds?

    I have an 8 speed HSE with I think 34k on it, the vehicle is due for its service now.

    I am wondering about getting the conversion gearbox sump arrangement? I have towed a 2.5 tonne van about 8k, so I am conservative about being able to maintain good tranny fluid.

    This thread has become long, and it seems mostly about the 6 speed? I would like to be able to do part fluid changes?

    Can a Victorian dealer do this without ripping me off? Or is there a LR specialist who might handle the gearbox part fluid replacements without hurting my extended LR warranty?

    Cheers all ...

  9. #9
    Join Date
    Jan 2017
    Location
    Sunshine Coast
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    118

    Disco 4 Automatic Transmission FAQ - 8 Speed

    After buying a used D4 that had been used for towing with 45k on the clock I elected to fully change the transmission fluid & filter just to be safe at the 50k mark.
    Sourced a genuine ZF pan and the Lifeguard8 fluid from Motospecs in Brisbane. It turned out to be a pretty easy job on a hoist & following the excellent instructions provided by Robbie on the UK site shown in previous posts, but there are a few little tricks that can make life easier.
    Once the oil is drained the pan bolts can be removed with a #40 Torx driver. The fun starts with the four front & three rear bolts which are directly above the cross members.
    I used the below tool which is part of a Halfords kit.


    Before removing the last of the bolts remove the bracket holding the wiring on the right hand (drivers) side of the transmission using an 8mm socket.

    Remove the last of the pan bolts and lower the pan & rotate it clockwise (viewed from below) to get it out.
    Mine was pretty clean, as was the oil, and I backflushed the filter to have a look. Only minor wear elements inside, so all good.
    Here's what the tranny looks like without the pan.

    From there it's just a reversal of the steps to get it back on.
    Refilled with Lifeguard8 as per Robbie's instructions and reset the adaptions with the Gap tool and we're done. Tranny is smoother and drives nicely, not that it was bad before, just more refined.
    Interestingly both the old & new pans have a spare set of the clips used to hold the filter in place, so it's likely that a filter on its own is available, but I haven't checked. The spare clips are visible at the bottom of the photo, stored vertically.

    Lifeguard8 fluid bottle & part number shown for reference below.

    Plan now is to drop the fluid at 40k intervals & change the filter on the third.

  10. #10
    Join Date
    Jan 2017
    Location
    Sunshine Coast
    Posts
    118

    Technical info direct from ZF website

    If anyone is interested the ZF website has additional technical information on the ZF8 HP70 here:
    Cars | 8-Speed Automatic Transmission - ZF Friedrichshafen AG

    It gives some interesting info and shows:
    • Internal cutaway images showing the two brakes & three clutches as well as the torque converter.


    • Exploded view of the internal modules


    • How the brakes & clutch packs select each gear. Makes some sense of how the adaptions work when looking at a scan tool like the Gap IID


    • Gearbox versus torque handling graph. Interestingly, at 600Nm the 'box has 100Nm "headroom" of rated torque handling capacity so it should last if not abused.


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