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

  1. #571
    Join Date
    Jun 2010
    Location
    Australia - Grey Nomad
    Posts
    141
    Gday...

    Thanks for the responses and advice. I think it has become a bit like having a tooth ache and the making a dentist appointment the pain goes away as soon as ya hang up from making the appointment.

    I actually gave it a drive with a 'bit of welly' yesterday and it hasn't clunked into or out of 1st since doing that.

    Today it is back to being just my 'perfect little Disco'

    I will see how it goes over the next few days.

    Thanks again - John

  2. #572
    Join Date
    Sep 2014
    Location
    Baldivis WA
    Posts
    457
    Quote Originally Posted by Disco-tastic View Post
    John, mine clunks from 1st to 2nd when cold. It also clunks when taking off after coasting (with the dreaded indecisive delay). Apart from that it drives just fine. It has 187k km.

    I'd suggest driving it around in sport mode and see if that makes a difference, as it may just be the programming. I've heard if you drive it like you stole in sport mode for a day or two, then change back to normal mode, the gearbox kinda relearns your driving habits.

    Give it a go and let us know how you go.

    Cheers

    Dan
    The clunk is due to wear in the valve body and most commonly the small accumulators at the end of each valve line, leaking internal seals and clutch cylinder bypass. Sonnax ZIP kits have all the parts that you need to cure this. There is also wear on the clutch packs over time, 180,000 of constant load will do that. Dirty fluid also causes shift problems and partially blocked solenoids.

    Sports mode increases the line pressure in the valve body, allowing the transmission to hold gear longer, plus the shift rpm point is set higher by the mechatronic unit (it’s programmed in).

    The transmissions ecu is adaptive, in that it “learns” your driving style within set parameters.

    So driving it “more proactively” (i.e like you stole it) will see shift points change within preset (non changeable) limits. It will also flush out the valve body, oil cooler and torque converter.

    It’s also better for the engine, burning off build up etc.

    Murder on the fuel economy though...

  3. #573
    Join Date
    Oct 2007
    Location
    Brisbane West
    Posts
    5,825
    If you bought one of these with say 50,000k on the dial and then changed the fluids every say 40,000k would you be confident of getting say 250,000k before forking out the big dollars or is that just too optimistic?

    Cheers

  4. #574
    Join Date
    Jun 2010
    Location
    Central Coast NSW
    Posts
    1,712
    Quote Originally Posted by ozscott View Post
    If you bought one of these with say 50,000k on the dial and then changed the fluids every say 40,000k would you be confident of getting say 250,000k before forking out the big dollars or is that just too optimistic?

    Cheers
    Ive heard of fully sealed transmissions reaching those km so i would expect longer out of a serviced transmission.
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

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