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  • #1

    Muncie m21 problems

    Does anyone know how to rebuild muncie m21 4 speed transmissions? Mine pops out of 4 gear while driving. Any clues? Thanks
    Tags: 12 bolt
  • #2
    First I would check your shifter to make sure it's adjusted correctly. If it's not the shifter, your 3-4th slider is toasted or the engagement teeth on 4th gear could be worn. I've been through a few Muncies and this seems to be a common problem. Unfortunately this means you'll have to disassemble most of the trans. Let me know if you plan to tackle it yourself.

    Tony

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    • #3
      WMCCRXPOWER's husband Dave is the WMCC tranny pro. Contact him if you want it rebuilt.
      If you want to replace it, we have an original 50,000 mile M21 that has been checked out and is in perfect condition for $700.
      '73 Z28 388 Stroker, M22 Rockcrusher 4 speed
      WMCC Photographer and owner of Redline Photography
      You are only young once but you can be immature your whole life!!!
      sigpic

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      • #4
        Originally posted by 70L34 View Post
        First I would check your shifter to make sure it's adjusted correctly. If it's not the shifter, your 3-4th slider is toasted or the engagement teeth on 4th gear could be worn. I've been through a few Muncies and this seems to be a common problem. Unfortunately this means you'll have to disassemble most of the trans. Let me know if you plan to tackle it yourself.

        Tony
        Tony, i rechecked the shifter ajustment even though i just put the brand new shifter on. It was ok. I have since removed the trans and it looks like the mesh teeth are pretty worn down on the input gear which i am pretty sure is 4th gear. Are these hard to rebuild and how much do you think it would cost for me to go through it? Thanks

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        • #5
          Originally posted by zmanrc View Post
          WMCCRXPOWER's husband Dave is the WMCC tranny pro. Contact him if you want it rebuilt.
          If you want to replace it, we have an original 50,000 mile M21 that has been checked out and is in perfect condition for $700.

          zmanrc, is that m21 close or wide ratio? I want to go from the 220 1st to the 252 1st gear. I'm not sure if the m21 came with the steep 1st though. I think i might have to go to a m20. Thanks

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          • #6
            Tremec 5 speed conversion is on the way. I am excited!

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            • #7
              Originally posted by 67rsss View Post
              Tremec 5 speed conversion is on the way. I am excited!
              And taller gears right after that...lol...
              Originally posted by Redd8407
              I WANT NOISE! SPEED! AN ENGINE THAT SHAKES MY INTERNAL ORGANS LIKE THEY GOT PARKINSON'S! I DONT WANT AN ENGINE THAT IS PARTIALLY POWERED BY MY LAPTOP BATTERY!
              Originally posted by Z28ISGR8
              WHY THE F*CK IS THERE A GOAT ON A FERRARI?
              Originally posted by Darren
              I think it is because I take it in and out all the time, the rubber has just stretched out, especially at the bottom where it is really thin. It annoys me more then anything.

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              • #8
                Originally posted by 81DaytonaPaceCar View Post
                And taller gears right after that...lol...
                LOL! The car has a 12 bolt with 4.10 gears. Hopefully that should work well with the tko's 2.87 first gear. Doug

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