Open to LSD (internal swap)

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  • Jim Lepage
    E30 Enthusiast
    • Jul 2008
    • 1138
    #1

    Open to LSD (internal swap)

    Here's my question. What I need to convert my 3.73 open diff to a LSD ?

    I see you coming with: Buy one, it's easier !

    I know but here in Québec I have a hard time to find one at a fair price. A BMW specific scrap yard coted me 750$ for a used 3.73 LSD. Freaking crazy IMO !!! And E30s are almost impossible to find in pick and pull yards.

    Buying one from the states would cost me a lot in shipping so this is why I'm asking this question.

    What parts I need to convert it and are they easy to find or it's almost impossible ?

    Thanks !
    E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50
    Tags: None
    • kronus
      R3V OG
      • Apr 2008
      • 13003
      #2
      you need the whole LSD pumpkin. The ring gear from your open diff bolts to it and the whole assembly drops into your diff casing.
      cars beep boop

        Comment

        • Jim Lepage
          E30 Enthusiast
          • Jul 2008
          • 1138
          #3
          Originally posted by kronus
          you need the whole LSD pumpkin. The ring gear from your open diff bolts to it and the whole assembly drops into your diff casing.
          Something like this ?

          Error Page | eBay
          http://www.ebay.ca/itm/BMW-E36-LSD-CENTRE-LIMITED-SLIP-DIFFERENTIAL-E30-E23-E24-E28-/230788299313?pt=Motors_Car_Truck_Parts_Accessories&hash=item35bc0dfa31#ht_500wt_1287
          E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

            Comment

            • e30leigh
              E30 Addict
              • Mar 2012
              • 481
              #4
              got a welder? mig the shit outta the spider gears. lock that bad boy up. diff slip is boring haha.

                Comment

                • Jim Lepage
                  E30 Enthusiast
                  • Jul 2008
                  • 1138
                  #5
                  Originally posted by e30leigh
                  got a welder? mig the shit outta the spider gears. lock that bad boy up. diff slip is boring haha.
                  I could, if you pay my rear tires ! :)
                  E30S54 - Scale Suspension / Unix Performance Coilovers - 17x8 and 17x9 BBS E50

                    Comment

                    • FredK
                      R3V OG
                      • Oct 2003
                      • 14743
                      #6
                      Originally posted by Jim Lepage
                      Something like this ?

                      http://www.ebay.ca/itm/BMW-E36-LSD-C...#ht_500wt_1287
                      Exactly.

                      You will have to "set up" the differential in order to properly install the LS unit. The bearing preload and side-to-side ring gear position are set by shim stock. There should already be a shim on each side of the differential side plates. But this may change with the installation of the LSD. Probably not a whole bunch, but you'll have to use gear marking compound to be certain. BMW still sells shim packs.

                      Thinner set: 33 13 9 065 734
                      Thicker set: 33 13 9 065 735

                      The fore-aft pinion-to-ring clearance is set by a shim in the case. You probably won't have to fool with this.

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