1990 E34 520i - Differential Replacement Question

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  1. 1990 E34 520i - Differential Replacement Question 
    #1
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    chromiumuk's Car Details
    Model of Car:
    520i se
    Year of Manufacture:
    1990
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    manual
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    saloon
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    Hi all, Have also posted this on other forums but so far no-one seems sure.
    I've got a manual 1990 H reg e34 520i which is an early m50 engined car. This means it has the "fitted for three months only" so called overdrive gearbox & 4.27 differential.
    Problem is, my diff is now quite clunky & because it was only made for three months appears to be quite rare. The later diffs are far too tall gearing wise at 3.46 but the earlier m20 engined e34 520i diffs are listed as 4.44 which is much closer to mine (in fact would be a better ratio as I feel it could do with slightly lower gearing).

    I just want to know whether the earlier diff will fit & bolt up to the prop without any problems & if anyone on here has tackled this swap before. I believe that cars fitted with autoboxes have a different prop flange on their diff which can be swapped over at a push but there are issues with torqueing it back up correctly so I would prefer to try to source a manual one if it would be a simple swap.

    Thanks
     
     

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    #2
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    Kevin Whittaker's Car Details
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    Can anyone assist the OP with his differential selection?
     
     

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    chromiumuk (23-06-2011)

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    TheEnd's Car Details
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    If the "TYP" code is the same, it will fit.
    I'd imagine it would be a TYP188 (188mm medium case) so any other 188 e34 diff will have the same mountings/cover plates.
    If you have a TYP210 large case, look for another large case with a suitable ratio.
     
     

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    chromiumuk (23-06-2011)

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    #5
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    chromiumuk's Car Details
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    Year of Manufacture:
    1990
    Transmission Type:
    manual
    Car Body Type:
    saloon
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    Thanks guys, I believe it is a medium case. Someone else from another forum believes that an e28 518i & 520i diff with the 4.1 ratio can be fitted if the rear cover & output shafts are changed over.
    All info so far from here & elsewhere leads me to believe that the earlier e34 m20 engined diff will fit possibly with some swapping of bits so I think it's worth a try.
     
     

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