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Thread: Nooooo, gearbox is dying!

  1. #41
    josh.huber Guest
    I have emailed sonnax to enquire about other work they recommend while I'm in there.. I get a drive line snatch that I thought was transfer case.. on off throttle bump. I'll post up what they recommended aswell as results after I fit the kit

  2. #42
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    Quote Originally Posted by josh.huber View Post
    I have emailed sonnax to enquire about other work they recommend while I'm in there.. I get a drive line snatch that I thought was transfer case.. on off throttle bump. I'll post up what they recommended aswell as results after I fit the kit
    I get that post rebuild. Always have. I believe it’s simply on off throttle transition
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  3. #43
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    Quote Originally Posted by DiscoJeffster View Post
    I get that post rebuild. Always have. I believe it’s simply on off throttle transition
    Signal latency between throttle application, 21 ECUs and about a billion bytes of data being transferred before the car says "Ok, I'll go" after your foot asks for it.

  4. #44
    josh.huber Guest
    Mine's not a delay. If I get on and off the pedal aggressively I can make it sound like something is coming through the floor. I have suggested to sonnax is in the application of the Torque converter. It's getting worse too.

  5. #45
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    I was reading on their website that bypass in the pressure control valve leads to lower than acceptable fluid pressure, so the tc does not lock up correctly. This is what an oversize pressure control valve can solve and save the TC.

  6. #46
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    Quote Originally Posted by josh.huber View Post
    Mine's not a delay. If I get on and off the pedal aggressively I can make it sound like something is coming through the floor. I have suggested to sonnax is in the application of the Torque converter. It's getting worse too.
    This?


    Discovery 3 worn front propshaft - YouTube

  7. #47
    josh.huber Guest
    I wish, all my shafts are checked and new. I've spoken with sonnax a little and called around. I've been put on to a tranny expert who can vacuum test the valve body and they have machinists ect working there. They were so friendly to deal with and reasonably priced I decided to just take my valve body and parts to them. He could have supplied cheaper but I already have most of it.

    I am getting the whole block vac tested. Before. Then after to see what was worn to help others with diagnosis.. Because I don't want to open it again.. I'm doing all the optional boost control valves etc at the same time. This bloke has the tools to do the job.

    I'll post up my reports when I'm done.. He also buys and sells sonnax parts. Was very conversant in 6hp28 boxes. I only rang to see if he could vac test after I did the zip kit. He was so easy and cheap I just said **** it. Let's not mix this up. Do the whole valve body and give it back.

  8. #48
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    Nooooo, gearbox is dying!

    I note in Perth Driveline in Osborne Park are the Sonnax and authorised ZF agent but I’ve never heard anyone use them for transmission work.

    Home -

    Interesting read - TECH -

  9. #49
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    Good valve body rebuild video of Sonax kit installation

    CAR NINJA! Valve Body REBUILD - YouTube

  10. #50
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    Quote Originally Posted by PerthDisco View Post
    Good valve body rebuild video of Sonax kit installation

    CAR NINJA! Valve Body REBUILD - YouTube
    Thanks for sharing 👍

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