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Thread: Diff bolts differences?

  1. #1
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    Default Diff bolts differences?

    So today I removed a 4.1 open diff originally fitted to a 91 320i .

    I then fitted a 3.64 lsd that was in an e36 compact.All went well until the end where the half shaft bolts are a different spec.

    The placement and spacing of the 6 bolt holes on each side of both diffs is identical.But only after fitting the new diff I discovered the new diff bolt holes are slightly narrower so I couldn't compete the job meaning I'm feckin car less until I get this sorted as I don't want to undo all that work today.

    What is my best option here? Any ideas?

  2. #2
    Conor_Smyth's Avatar
    Conor_Smyth is offline Premium Member (Site Supporter)
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    Just get new bolts? Wouldn't think they would be much from BMW? Never came across different bolts before when swapping diffs myself

  3. #3
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    Got speaking to a fella says the half shafts are different on the 320 compared with the 325. 6mms bolts vs 8mms and apparently the flange is slightly different too.

  4. #4
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    Never noticed that when I swapped from 320 to 325... Maybe I swapped over the cups... cant remember now. Must compare the weekend when I'm home as i think i still have the old 320 diff

  5. #5
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    I think it is the cups. Picked up cups and shafts today from a 325 so hopefully get sorted when I get back at it....it's in a different county now as I wasn't gonna refit the old diff again to get home. One of the top bolts was a complete pig.

  6. #6
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    Turns out I needed new caps. All sorted.

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