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  • Any 6 speed transmission conversion options?

    Searched but still couldn't find anything. So here goes.

    My tranny is shot, first and second gear synchros are on the way out.

    I could swap in a used one and be done with it or rebuild this one but I got to thinking.

    Can I put in a 6 speed? Anyone done this with the S14? Taller gears on the highway would be nice and it would move my shift points.

    Tired of getting stuck at the top of third before the braking zone on a few of my favorite tracks.:drive:

    Engine swaps are not an option. An E30M3 without a S14 won't work for me.

    I can get a driveshaft shortened, machining for brackets etc. Not too worried about modifications to make it fit.


    Any Ideas? Suggestions?

  • #2
    Hi, onrailsM3,
    I think the 6 speed tranny from an E46 M3 will work, with a different drive shaft. There is one FS below.
    Larry

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    • #3
      Tthe S14 bellhousing is different from the later motors. IIRC, the OEM option is the E34 M5 6spd, which is rare and huge and extremely expensive. You would probably be best off having a custom bell housing welded together, but that is neither easy nor cheap. It would have the advantage of letting you install a modern transmission, though, which would be nice. Old 6spds are not the best.
      2006 GMC Sierra 2500HD 4WD LBZ/Allison
      2002 BMW M3 Alpinweiß/Black -
      AST 4100 500/500, Fikse Profil 13
      1999 323i GTS2 Alpinweiß
      1990 325is Brilliantrot/Tan
      - GC
      1989 325is Alpinweiß/Black - S50B30,GC/Koni, BBS RX, Peerless Skid, Sway
      1989 M3 Alpinweiß/Black - Basket Case

      Hers: 1996 Porsche 911 Turbo Black/Black
      Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
      272 cam, Korman driveshaft, R888s, H&R/Bilstein

      sigpic

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      • #4
        I looked into it sometimes ago...
        despite the bellhousing issue, I could not find any which was so good in therms of gear ratios to be worth the trouble.
        Most 6-speeders had the 1st way too short and then the gaps 1-2, 2-3, 3-4 far to wide, so it would have been worse to drive than the OEM dogleg.

        Later I found a Quaive 6-speeder with excellent ratios (even available with S14 bellhousing) but that costs somewhere around 5-6000 Euros...there is a post from me somewhere around here.

        Thomas
        sigpic

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        • #5
          There is a group A six speed trans for the S14. Very expensive, $10K or so.
          Several E30 M3's.

          More than I need but not as many as I want....

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          • #6
            Tranny work is not cheap, by far the easiest and cheapest would be to swap in a used stock tranny and a different diff.

            It's still a 5-sp, but Anders put in a Tremec with some work, not sure what the ratios are.
            sigpic
            Track Car Build | COM Sports Car Club

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            • #7
              I always come to the conclusion that...unless you really like complicated projects and are looking for one....with things like 6 speed tranny conversions the costs and hassles far outweigh the benefits.

              Comment


              • #8
                6 speed sequential motorsports box replacement for getrag 265

                http://www.drenth-gearboxes.com/prod...0-gearbox.html

                $$$$$$
                Angus Proud
                88 E30 M3 X2
                89 E30 325IX
                92 R100GS/PD
                :ha:

                Comment


                • #9
                  Originally posted by spdracrm3 View Post
                  6 speed sequential motorsports box replacement for getrag 265

                  http://www.drenth-gearboxes.com/prod...0-gearbox.html

                  $$$$$$
                  Now THAT I would do if I just had money lying around.

                  But I think they are around $15K....and need complete rebuilds after around 24 hours of use. Probably another $6-8K for the rebuild....

                  Comment


                  • #10
                    I looked at a couple of options ages ago, S2000 and 350Z. IIRC the 350Z had the better ratios.

                    That is all I did mind.
                    Sport Evo No.47

                    My Sport Evo Restoration

                    Comment


                    • #11
                      Used box is the way I am going to go. TY

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                      • #12
                        Originally posted by Ironhead View Post
                        I always come to the conclusion that...unless you really like complicated projects and are looking for one....with things like 6 speed tranny conversions the costs and hassles far outweigh the benefits.
                        I have to say that in my daily driving E30, the 6spd is one of the best things that I've done for the car. I could either make the car feel decently quick around town, OR feel good on the highway with the 5spd. With the 6spd, I can have both. It's really, really nice. It's not $10,000 nice, but if I were running an S14, I would be absolutely willing to spend a couple grand making a 6spd work.
                        2006 GMC Sierra 2500HD 4WD LBZ/Allison
                        2002 BMW M3 Alpinweiß/Black -
                        AST 4100 500/500, Fikse Profil 13
                        1999 323i GTS2 Alpinweiß
                        1990 325is Brilliantrot/Tan
                        - GC
                        1989 325is Alpinweiß/Black - S50B30,GC/Koni, BBS RX, Peerless Skid, Sway
                        1989 M3 Alpinweiß/Black - Basket Case

                        Hers: 1996 Porsche 911 Turbo Black/Black
                        Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
                        272 cam, Korman driveshaft, R888s, H&R/Bilstein

                        sigpic

                        Comment


                        • #13
                          I looked at a couple of options ages ago, S2000 and 350Z. IIRC the 350Z had the better ratios.
                          I think the S2000 ratios would be most suited to the S14.
                          sigpic

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                          • #14
                            Sadev

                            http://www.r-box.be/en/news/detail/65


                            [email protected]

                            1969 2002 racecar
                            1989 M3 racecar
                            e39 Touring

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                            • #15
                              7500rpm redline and 225/45 16 and 4.10:1 diff

                              S2000

                              1st 41.6mph
                              2nd 63.8
                              3rd 88.1
                              4th 112.4
                              5th 134.5
                              6th 163.1

                              350Z

                              1st 34.4
                              2nd 56.2
                              3rd 80.5
                              4th 102.7
                              5th 130.5
                              6th 164.3

                              Looking at these, they both seem a little long on 6th.

                              Steve
                              Sport Evo No.47

                              My Sport Evo Restoration

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