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S3 rear differential

Discussion in 'A3/S3 Forum (8L Chassis)' started by kachnak, Nov 6, 2009.

  1. kachnak
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    kachnak Active Member

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    [Nov 6, 2009]
    Hello, I hear some bad sound from rear side my car, but only when I start moving from 0km/h and steering wheel is fully left or right. When I start moving forward there is no bad sound. I hope that will be rear wheel bearings, but my friends said it will be differential. What do you think? I will go to my mechanic next week.

    Is it possible replace audi S3 1999 210hp rear differential by audi TT 2002 225hp differential? Are they same?
    Thank you.
    #1
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  3. god_thats_quick
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    god_thats_quick Numptie of the highest order

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    [Nov 6, 2009]
    Should be the same diff (on all mk4 based cars), however you might want to swap your controller to the new diff assuming that's okay.
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  4. barters3
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    barters3 Member

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    [Nov 6, 2009]
    Try changing your haldex oil and filter if you havent already. Under the same driving conditions you mentioined,i used to get a grinding noise. I changed the above and it was sorted.
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  5. kachnak
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    kachnak Active Member

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    [Nov 6, 2009]
    Thank you. So I try to change oil and filter. Do you know what type of oil must be used there?
    Last edited: Nov 6, 2009
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  6. barters3
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    barters3 Member

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    [Nov 6, 2009]
    It's special haldex oil, it's available from vw or audi dealers and should be about a tenner. I can't remember how much the filter is but it's not expensive. It sorted the problem I had so hopefully you'll be lucky
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  7. tompearson
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    tompearson It's all in bits

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    [Nov 10, 2009]
    Just to let you know - I just had my oil and filter changed yesterday and it also cured this issue for me.
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  8. barters3
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    barters3 Member

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    [Nov 10, 2009]
    glad to be of assistance! Lol.
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  9. s4mark
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    s4mark Member

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    [Nov 10, 2009]
    i too have a vibration coming from the rear wheels when moving off from standstill on either left or right full lock. will try oil replacement and hopefully will sort the problem
    #8

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