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4.27 LSD Big case diff?

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  • 4.27 LSD Big case diff?

    A friend of mine who owns a BMW shop just bought 40 brand new diffs from a closing dealership. He told me he had five LSD diffs with 4.27 that fit an e30 chassis. I am perplex but will verify tomorrow. Anyone has any idea if 4.27 gears even exist for a big case like ours? BTW If he says it should fit, I will believe him as he has an e30 M3, an e36 racecar and has been in BMWs for 35 years. But still perplex.


    [email protected]

    1969 2002 racecar
    1989 M3 racecar
    e39 Touring

  • #2
    I am sure there are.

    Our diffs are cosidered medium cases. The 4 cylinder E30s (except the S14) have small case diffs. IIRC the E30 internals ill swap with the E36s with no problems. The E36 M3 Evo (Euro 3.2) has a large case diff.

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    • #3
      i think they pull the gears from e34 7's

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      • #4
        e30 318i cabrio automatic has a 4.27 IIRC

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        • #5
          Originally posted by 1990m3 View Post
          e30 318i cabrio automatic has a 4.27 IIRC
          small case

          Mike

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          • #6
            i know, but it is a 4.27, maybe the guy with the diffs has the case sizes confused??

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            • #7
              could be, I guess we will find out.

              Mike

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              • #8
                I will be checking tomorow.


                [email protected]

                1969 2002 racecar
                1989 M3 racecar
                e39 Touring

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                • #9
                  Lee, what's the benifit of going with a 4.27 diff? A 4.15 diff is already very high and can argue first gear is already too short.

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                  • #10
                    4,27 definitely exsists in medium (188) diffs, I have one in my e30 325i racecar.
                    I believe this ratio can be found on a e34 518 touring.

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                    • #11
                      Originally posted by hernando View Post
                      Lee, what's the benifit of going with a 4.27 diff? A 4.15 diff is already very high and can argue first gear is already too short.
                      4.11 or 4.27 are almost the same and 4.11 is what most of US M3s have. 1st is barely used anyway, so shorter is not a problem. The reason why I am interested by those diffs is because they are Brand New Old Stock and affordable. A rebuild costs around $1300 minimum. I can have those babies for half that.


                      [email protected]

                      1969 2002 racecar
                      1989 M3 racecar
                      e39 Touring

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                      • #12
                        Scoot Casagrande has a 4.27 big case in his JP car
                        sigpic
                        2010 BMW Club Racing E30 M3 Touring Car Champion
                        2011, 2013 SCCA Runoffs Super Touring Under 3.0L Bronze Medalist
                        2011 SCCA Jim Fitzgerald Rookie of the Year
                        2012 SCCA Northeast Divisional STU Champion
                        2015 SCCA Runoffs STU Polesitter

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                        • #13
                          Originally posted by JS154 View Post
                          Scoot Casagrande has a 4.27 big case in his JP car
                          So Scott no longer races his 325? I remember when he was attending drivers schools and ambitionned going into CR.


                          [email protected]

                          1969 2002 racecar
                          1989 M3 racecar
                          e39 Touring

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                          • #14
                            i have a big case 4.45. the 318is 4.10 with lsd also had the big case. its just the 4.27 and the 4.45 in a big case dont have lsd and you need to install it. i found a guy locally that does great work. he charged me 150.00 to put lsd in my 4.45 from a 4.10 i had laying around.
                            .
                            Last edited by Bennetts22; 05-23-2007, 06:54 AM.

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                            • #15
                              I just bought the brand new 4.27 LSD to fit my M3. I only need to change the rear cover. It is brand new, and cost me... a song.

                              Diffs are all Euro diffs. Including a Z1 diff.


                              [email protected]

                              1969 2002 racecar
                              1989 M3 racecar
                              e39 Touring

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