E36 diff ratio change to 3.91, Small problem please help.

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  1. E36 diff ratio change to 3.91, Small problem please help. 
    #1
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    Hi,

    I have an e36 323 188 medium case differential as a doner
    for the 3.91 crown wheel and pinion I have bought.

    It was advertised as medium case fitment but I've run into a
    little problem while putting it all back together.

    First I must explain that the work is being done by a gearbox and
    diff engineering shop and they are great at what they do.
    They have said that the ring fits perfectly but there is about a 3mm
    space where the two engage together which should be closer.

    They've asked if there is supposed to be some kind of spacer or is there
    something else we're missing? They think it could need a smaller case?

    Please could anyone that's handled a change like this give me some advice,

    Many thanks

    Tom
     
     

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    disco!!!!'s Car Details
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    there is a shim behind the inner pinion bearing race (casing side) that can be swapped out for a different size
    No 9 in the diagram

    Drive flange suspension/gasket ring BMW 3' E36, 328i (M52)

    and also you will need to adjust the shims for the output flanges
    No 8 in the diagram

    Drive flange suspension/gasket BMW 3' E36, 328i (M52)

    seeing as you sent it to a gearbox and diff shop you think that they would know that these shims need to be adjusted when any work is carried out, I would be questioning their ability to do the work
    loud-low-slow-project


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    #3
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    Thanks for your reply fella, I hoped they we're capable because they came recommended.

    I'll pass on what you advised and report back :-).
     
     

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    #4
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    Oh one thing i missed out

    there are 3 sizes of diff for the E36
    small, medium and large

    small is for the 4 cylinder cars with the exception of the 320i
    medium is for the 323 to the 3.0 M3
    large is for the M3 EVO 3.2 only

    the 188mm ring gear will not fit inside the small casing
    adjusting these diffs isn't the easiest mainly time consuming due to getting the meshing of the gears bang on so try to make sure they get it right if not then at worst it could lock
    loud-low-slow-project


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    #5
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    Ok, I'll pass that on aswell, it's all going in an email tomorrow to them.

    Thank you
     
     

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    Ok, they have come back to me and asked which one of the pinion spacers it is on the diagram above?

    Is this something that would be slightly different in each build?

    Any help? :-)
     
     

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    Anyone know anymore on this? I'd like it done correctly rather than bodged :-)
     
     

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    #8
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    Anyone?
     
     

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