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Pre vs Post facelift S3 rear diff

Erf May 25, 2012

  1. Erf

    Erf Member

    Hi guys,

    Does anyone know if I can replace my post facelift rear diff with a pre face lift rear diff that has ESP? I know most pre facelift S3's don't have ESP, but I've found one that does so I'm assuming (and hoping) that they will be compatible. Any ideas?

  2. Dani_B19

    Dani_B19 Audi-sports own special child.

    I think they should be, i believe its the haldex system thats the difference but not 100% sure
  3. Erf

    Erf Member

    to be fair it's the haldex system I'm most interested in! My haldex mechanism has gone kaput and Dean from 4rings has advised me that I need the Haldex clutch replaced. I thought the easiest way to do this would be to buy a whole rear diff with the haldex unit attached and then just bolt on the new unit and connect it to my haldex ecu...

    Found a pre facelift one that had ESP and wondering if that would be fine.
  4. Gops

    Gops Badger 5 Edition VCDS Map User Gold Supporter Audi S3

    Yeah should be fine.. The only thing I'm thinking is pre facelift don't have an earth strap, but you can just makeshift one! The haldex should work fine to my knowledge!
  5. Erf

    Erf Member

    Hi Guys,

    Just to give you an update on this. Audi have confirmed the part number from the donor car and my car are the same so I have gone ahead and purchased the rear diff. However, I'm concerned about the earth strap. Is this going to mess things up for me? Can I retro fit an earth strap to a pre facelift diff? Has anyone done it before?

    The diff is with my mechanic and he is due to fit it on Monday. Does anyone have a pic showing how the earth should be connected to the rear diff on a post facelift car?!

    Any help woould be appreciated!!

    Already spent a shed lost in the last month (new front ARB, new R32 rear ARB, new front wishbones, replaced the steering rack) so I don't want to waste money cocking this up!

    EDIT - found this earth strap @ halfords Halfords | Halfords Braided Earth Battery Cable 22cm (9")
    Last edited: Jun 9, 2012
  6. Erf

    Erf Member

  7. AARON77

    AARON77 Well-Known Member

    I replaced my diff with the facelift diff & had no issues at all
    the plugs were completely different but we spliced them together with no problems too :)

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