M3 e46 Rear Diff

Discussion in 'Engine maintenance, upgrades and modifications' started by leejohn, Jul 1, 2017.

  1. 1 Jul 2017 at 1:03 PM #1
    leejohn

    leejohn A mere Chipper

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    could someone please recommend a good reliable garage who rebuilds or replaces diffs and how much does it cost?
     
  2. 1 Jul 2017 at 1:14 PM #2
    cossie1

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    Don't know about any garages.

    But Mrd1984 on here, rebuilt my diff for me a few months back.

    Drop him a PM (although he is at Goodwood this weekend I believe).
     
  3. 1 Jul 2017 at 2:17 PM #3
    schooner32

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    Parts for a rebuild is about 250 max. But remember the LSD itself is not serviceable. Clutches and steels are not available
     
  4. 7 Jul 2017 at 10:18 PM #4
    Mrd1984

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    Thanks cossie1.

    Im back now. Goodwood was good. Would you like a diff built leejohn?
     
  5. 4 Aug 2017 at 10:55 AM #5
    rusticm3

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    Interesting, so if i'm looking at totally refreshing my diff and changing final drive what are the options. Or is just replacing seals etc good enough?
     
  6. 4 Aug 2017 at 11:49 AM #6
    schooner32

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    To change the final drive you need to order a new Cwp and ring gear, option's are 3.91, 4.1, 4.44.

    A refresh means new bearings (x4) and new seals (x3) and o rings (x2) and preload crush sleeve. (X1).

    If you have any desire to change the final drive ratio then this is the time to do it.

    Bearings should be fine but it's not that hard to change them .
     
  7. 24 Aug 2017 at 10:51 AM #7
    WayneB

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    MrD, whats the cost of having you rebuild my diff?
     
  8. 24 Aug 2017 at 11:58 AM #8
    Mrd1984

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    Its about £600 mate. depending on what oil you want and if you want to update a couple of bits.
    But the end result is a freshly rebuilt diff that has a full factory spec preload and backlash reset.
     
  9. 23 Sep 2017 at 6:50 PM #9
    LSD

    LSD Rocking a new hat

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    That's not a bad price I might be in touch when I get get my 4.1
     
  10. 24 Sep 2017 at 10:09 PM #10
    AC427

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    Hi Mrd, Which parts of the diff are upgradeable ?
     
  11. 26 Sep 2017 at 10:04 PM #11
    Mrd1984

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    Hi,
    You can upgrade most of it.
    Motorsport crown wheel and pinion (4.10, 4.44 ratios), Diffenent LSD unit (gripper, Wavetrack, Quaife).
    The bearings and seals stay the same though.
     
  12. 27 Sep 2017 at 8:58 AM #12
    paulclaude

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    Just rebuilt a diff myself with 3.91 gear set and all new bearings and seals. Nice little job, definitely requires the right tools and setting up.
     
  13. 27 Sep 2017 at 9:09 AM #13
    Mrd1984

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    How do you find the 3.91?

    Its a very subtle change isn't it. But still makes an improvement.
     
  14. 27 Sep 2017 at 2:58 PM #14
    paulclaude

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    Didn't have time to fit it, but will have it in once i'm back from work. Should pair nicely with my present engine power/track use :thumbsup:
     

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