Can someone help link me to info RE 318is LSd upgrades

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  • vespam5
    Advanced Member
    • Feb 2008
    • 147

    #1

    Can someone help link me to info RE 318is LSd upgrades

    I have not been able to figure out whether e30 325 and e30 318 rear ends are interchangable.

    I'd like to get a 4.10 LSD into my 1991 318is (my diff is non lsd 4.10) and trying to figure out the right recipe, if anyone has done this or can help me find the right thread I'd really appreciate it.

    Thanks
    "you name it I've owned it, 1600,2002,e28,e30,e32,e34(m5),e36,e46(m3)"
  • 87e30
    R3V Elite
    • Jul 2008
    • 5676

    #2
    Your car should have come with a limited slip. Look for a tag on the back of your diff that says 4.10 and see if it says 4.10s. Or there is an S somewhere, that means it's an LSD.

    I know the 4.10 came in the 318is and m3. Not sure where else you'll need to look to find one.
    Originally posted by z31maniac
    I just hate everyone.

    No need for discretion.

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    • xwill112x
      Θέλησα έναν τίτλο συνήθειας, απορροφώ για να είμ&#
      • Jan 2009
      • 4237

      #3
      just get a auto 325is diff. medium cased diff, so you cant kill it with a 318 amd its a 4.10lsd. the 318is had the OPTION of a LSD, it wasnt standard btw.
      sigpic

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      • vespam5
        Advanced Member
        • Feb 2008
        • 147

        #4
        Thanks for the info guys. My diff is not an LSD since wheels spin opposite ways when off the ground and there is no "S" on the tag.

        Are the 318 and 325 driveshafts/subframes/drive axles/etc the same? Diffs swap out between all e30s?
        "you name it I've owned it, 1600,2002,e28,e30,e32,e34(m5),e36,e46(m3)"

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        • vespam5
          Advanced Member
          • Feb 2008
          • 147

          #5
          Also I heard e28 diffs work if you swap out the back covers, will other diffs work too (e36 maybe)?
          "you name it I've owned it, 1600,2002,e28,e30,e32,e34(m5),e36,e46(m3)"

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          • BraveUlysses
            No R3VLimiter
            • Jun 2007
            • 3781

            #6
            You can swap in any e30 medium case differential or a small case 4.10--no need to worry about driveshaft length.

            Comment

            • naplesE30
              E30 Mastermind
              • Nov 2007
              • 1830

              #7
              Originally posted by BraveUlysses
              You can swap in any e30 medium case differential or a small case 4.10--no need to worry about driveshaft length.
              This is all you need to know.

              and yes like somone already said 4.10 lsd was an option in the 318is, they all came with a 4.10

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              • vespam5
                Advanced Member
                • Feb 2008
                • 147

                #8
                Thanks guys.
                "you name it I've owned it, 1600,2002,e28,e30,e32,e34(m5),e36,e46(m3)"

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                • 87e30
                  R3V Elite
                  • Jul 2008
                  • 5676

                  #9
                  My mistake, didn't realize same came without the LSD. What a shame.
                  Originally posted by z31maniac
                  I just hate everyone.

                  No need for discretion.

                  Comment

                  • Emre
                    E30 Fanatic
                    • Sep 2007
                    • 1228

                    #10
                    Originally posted by vespam5
                    Are the 318 and 325 driveshafts/subframes/drive axles/etc the same? Diffs swap out between all e30s?
                    Yes, it's a direct bolt-on swap. Good luck finding a decent medium-case 4.10:1 LSD, though. All the good ones are gone. And it's probably not a great idea to swap a diff with taller final-drive ratio into an M42B18-powered car.
                    sigpic
                    1987 Mercedes 190E 2.3-16: Vintage Racer
                    2010 BMW (E90) 335xi sedan: Grocery Getter

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