5 Speed rear diff?

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  • E30FreaK89
    E30 Addict
    • Apr 2006
    • 437

    #1

    5 Speed rear diff?

    im going to be doing a 5 speed conversion sometime in the future and was woundering what the best rear diff would be? i have a 4.10 right now..could i use that one or get a different one?
  • MR 325
    Moderator
    • Oct 2003
    • 37827

    #2
    Quite a few people swap out their 3.73 for a 4.10 actually.

    I'd say do the swap, leave the diff in there, and see how you like it.
    BimmerHeads
    Classic BMW Specialists
    Santa Clarita, CA

    www.BimmerHeads.com

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    • E30FreaK89
      E30 Addict
      • Apr 2006
      • 437

      #3
      alright i do that! thanks

      Comment

      • DarkWing6
        Moderator
        • Apr 2004
        • 7144

        #4
        4.10 lsd or 4.10 open? Either will work, but if you can swap to an lsd.
        sigpic

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        • Derek89E30
          Noobie
          • May 2006
          • 14

          #5
          question...how do you tell if your diff is lsd or open?

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          • delatlanta1281
            Dart Master
            • Mar 2006
            • 10317

            #6
            there should be a metal tab on the rear cover of you diff that says 410 and it should have an s on it. Also if you have an auto IS there is a very good chance it is an lsd. I have a 4.10 that I swapped from my 3.73 and I love the tourque it gives, but at 80 mph I run @ 3600 rpms, that's a bit high so I don't really speed anymore.
            Yours truly,
            Rich
            sigpic
            Originally posted by Rigmaster
            you kids get off my lawn.....

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