A999 First gear engagement

Discussion in 'Transmission and Drivetrain Tech' started by Jax, Sep 14, 2018 at 11:05 AM.

  1. Jax

    Jax Well-Known Member

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    I have a fully build A999 trans, we just have made about 15 passes on it. Sometimes when I shift into 1st gear the engagement of the trans does not take place right away. I rev the engine, and like after a second or so the car start moving.

    I have verified the oil and the trans is full, I thought probably it was low on trans fluid and took time to engage.

    What can be the cause of of delaying the engagement into 1st gear?
     
  2. CudaFactHackJob

    CudaFactHackJob Well-Known Member

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    Check fluid level idling in neutral. Always been this way? Hot or cold? Low 1 and D? Worn forward clutch..excessive clearance.
     
  3. Jax

    Jax Well-Known Member

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    No it wasn't always like that it start doing that like after 10 passes. Yes in low 1. It is a fully build manual transmission.
    Sometimes it engages right away sometimes not.
    And yes we have check the oil level but not in neutral but in park with the engine running cold.
     
  4. CudaFactHackJob

    CudaFactHackJob Well-Known Member

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    They usually say "Check when hot idling in neutral" on the stick. Torqueflites won't charge the converter in Park. Burnt forward clutch. Easy fix; just pop out the front drums is all. If the fluid is still bright red and there's nothing in the pan, you might be alright.
     
    Last edited: Sep 14, 2018 at 3:16 PM
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    • Jax

      Jax Well-Known Member

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      Thanks for the feedback. Will let you know
       
    • AJ/FormS

      AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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      L/R servo might be leaking, or worse cracked;
      assuming you have tightened up the band,lol.
       
    • Jax

      Jax Well-Known Member

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      No I haven't made any adjustment what so ever after we start using the transmission.
       
    • AJ/FormS

      AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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      Well then , a band adjustment would be first on my list of to-dos, and an inspection of the L/R servo at the same time.
       
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      • Jax

        Jax Well-Known Member

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        What is the procedure to adjust the band?
         
      • AJ/FormS

        AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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        To adjust the L/R band the pan has to come off. There is a procedure for adjusting it that I do not have documentation for.
        But I can tell you how I do it.
        I find the adjuster, back off the lock nut, and with a really small,short wrench, I just run the adjuster in until snug. Then I back it off until there is about 1/4 inch motion of the apply-arm, and lock her down with the nut. That band will run with more clearance and with less. If there is too much clearance, you might have a delayed engagement. If there is less it might really BAM! going into gear. Also with less clearance, the 1-2 shift-overlap may become an issue. Overlap causes the nose to drop during the shift, because some of the engines power is being used to fight the shift; the trans effectively being in two gears at once, with second applying and first releasing.
        I have found the 1/4 inch spec to work well for me without respect for what car the trans is in, and it's easy to remember.
        The pin you are clearancing, is part of the Low/Reverse servo assembly. The pin is steel, but the body it is installed into is aluminum. That part is a known weak part when the pressures have been tweaked for racing or high-performance. They crack, split and/or turn sideways. So check yours while you are in there. I don't think you can get it out of the bore without removing the band anchor-pin. But the crack/split should be obvious if it exists. Yours won't have rolled cuz then you lose reverse completely. And yes I have seen pictures of the lip seals blown, but have not personally seen it, although I haven't built that many myself either, perhaps two dozen.
         
        Last edited: Sep 15, 2018 at 8:04 PM
      • Jax

        Jax Well-Known Member

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        Thank you.. great info. Will use it if the problem persist