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  • #1

    Mfactory LSD Problems

    The bolts for my mfactory diff do not fit my ring gear. The bolt has a shoulder on it that is to big or the ring gear hole is to small. I contacted mfactory and they say its the gear (clearly they would). They said mazda had a batch of ring gears that were cut to a different tolerance. So im not sure what im going to do now!

    Looking for a stock g-series ring gear i guess.
    1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
    1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
    1989 (BRITSTIVA 1.0) B6T and sold
    19?? 150$ burnout car SOLD
    1991 (STRESS RELIEF)SOLD
    Tags: None
  • #2
    How big of a difference is it? Got a pic of the problem?
    Trees aren't kind to me...

    currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
    94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.

    Comment

    • #3
      I can get you one in a bit. The hole in the ring gear is to small. The shoulder on the bolt is .447-.448 the hole is .416-.417
      1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
      1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
      1989 (BRITSTIVA 1.0) B6T and sold
      19?? 150$ burnout car SOLD
      1991 (STRESS RELIEF)SOLD

      Comment

      • #4
        The bolts are left hand hardened shoulder slim head bolts. Gonna be super hard to find others to just buy!
        1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
        1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
        1989 (BRITSTIVA 1.0) B6T and sold
        19?? 150$ burnout car SOLD
        1991 (STRESS RELIEF)SOLD

        Comment

        • #5
          Just machine the bolts to fit I'm a machinest and it should be easy for anyone with a lathe good luck

          Comment

          • #6
            ^ Sorry, you can't tamper with the bolt sholder, that will make them too weak. Those bolts are the strongest in the whole car, the shock loading you know.
            Pics would help!
            What size are the holes in the carrier?
            Last edited by Dragonhealer; 04-07-2017, 09:02 AM.
            No car too fast !

            Comment

            • #7
              The hole im the gear is ø0.416"

              Bolt shoulder o.d. is 0.448"

              Thread is a left hand metric 1.0 tpi not sure the size. I have not looked yet. I dont think i will be able to fine another another bolt to fit. I really need to drill the gear
              1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
              1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
              1989 (BRITSTIVA 1.0) B6T and sold
              19?? 150$ burnout car SOLD
              1991 (STRESS RELIEF)SOLD

              Comment

              • #8
                Yeah, I'd just ream the ring gear. It's too bad you don't know any good gear shops that might have the tooling to do that Mike.
                Driving for me is neither a right nor a privilege. Driving is my passion, as it was for the people who invented the automobile, the people who paved the first roads and the people who continue to improve the automobile. Please respect this passion.

                Comment

                • #9
                  Had the same problem. iirc I had the machine shop ream the ring gear.
                  Better Than Nothing Racing

                  Way too many cars

                  :woc:

                  Comment

                  • #10
                    Your right, anyone in your neck of the woods with CNC carbon EDM?
                    No car too fast !

                    Comment

                    • #11
                      Originally posted by Advancedynamix View Post
                      Yeah, I'd just ream the ring gear. It's too bad you don't know any good gear shops that might have the tooling to do that Mike.
                      HAHA right! Its to small for my shop. Its hard for us to go below 20" this gear is even to small for all but the old little bridgeport. Even then i dont know if we have tooling for it. Im about to go search tho.
                      1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
                      1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
                      1989 (BRITSTIVA 1.0) B6T and sold
                      19?? 150$ burnout car SOLD
                      1991 (STRESS RELIEF)SOLD

                      Comment

                      • #12
                        So we clearly do not have tooling small enough for this gear! Sucks i work in the #1 large gear shop in the country and i cant put a hole in a gear! A local shop called RPM TOOL is going to hook me up. The guy said he will get me in this afternoon! Sweet. If all goes well i will be back up and running this Sunday night/so maybe next weekend ill be close to being done...
                        1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
                        1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
                        1989 (BRITSTIVA 1.0) B6T and sold
                        19?? 150$ burnout car SOLD
                        1991 (STRESS RELIEF)SOLD

                        Comment

                        • #13
                          Good then we can do mine lol.

                          Comment

                          • #14
                            William lets do it. Im getting good at it now...kinda
                            1990 (LUCIFER 2.0) fully built BP+T with E153, Fueltech FT500, traction control with hopes of 600hp (i drank to much of the KOOL-AID)
                            1990 OverKILL BP+T, evo ecu system, coilovers, aspire brakes, full advanced suspension, Garrett! The Autocross toy!
                            1989 (BRITSTIVA 1.0) B6T and sold
                            19?? 150$ burnout car SOLD
                            1991 (STRESS RELIEF)SOLD

                            Comment

                            • #15
                              Good stuff. Keep those gears turning!
                              Driving for me is neither a right nor a privilege. Driving is my passion, as it was for the people who invented the automobile, the people who paved the first roads and the people who continue to improve the automobile. Please respect this passion.

                              Comment

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