71 Duster 340, 727 Manual Valve Body - question...

Transmission and Drivetrain Tech

  1. 1967GTX440

    1967GTX440 Life is Short so Enjoy your Ride!

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    Hi Guys
    I'm having some issues with the 727 trans in my 71 Duster. My car runs a 416 stroker backed by a manual valve body 727. This weekend while down shifting into 1st at a light it was like I put it into PARK?!?! I had to shift into the 2nd position to get the car to move. It's a factory console car, but a previous owner swapped out the original shifter (which I still have) with a pistol grip (Shift-r-Gate version). So I thought that may have had something to do with it so I swapped the original shifter back into the car - which I like SO much better. But it didn't make any difference - how do you adjust the linkage on these transmissions?

    TIA
    Dave
     
  2. Donnie514

    Donnie514 Well-Known Member

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    I do not think it is a shifter problem.
    What brand of valve body is it?
    Is the band applied in first gear? Some are and some are not. If not it will free wheel in first gear. One way to find out is to lift on the throttle WHILE in first gear. If it free wheels then the band is not applied, If it drags you down, like a down shift then the band is applied.
    NOW THE BIG QUESTION.
    Why in the hell are you down shifting while you are moving?
    That went out with four speeds and glass packs.
     
  3. d55dave

    d55dave Well-Known Member

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    Most manual valve body manufacturers say not to down shift to first while in motion.
     
  4. 1967GTX440

    1967GTX440 Life is Short so Enjoy your Ride!

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    Guys, read the post, I was sitting at a light...

    The car would pull like a freight train in 1st up until this time, now all it does is sit there like it's in park, won't roll or anything.
     
  5. Donnie514

    Donnie514 Well-Known Member

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    Thinking you my be in 2 gears at the same time.
    Is this a reverse shift pattern?
    D, 2, 1...…..or 1, 2, D...….???
     
  6. 1967GTX440

    1967GTX440 Life is Short so Enjoy your Ride!

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    It kinda feels like that. It's a std shift pattern not reverse. It feels like it's in drive with the emergency brake on, but free wheels more than it would if that was the case. Thanks
     
  7. Donnie514

    Donnie514 Well-Known Member

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    Well back to your question.
    To adjust the linkage,....put the trans shift lever in park at the trans.
    Put the shifter in park.
    With light finger pressure hold the ROD towards PARK and snug the adjusting bolt.
    Done
     
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    • 1967GTX440

      1967GTX440 Life is Short so Enjoy your Ride!

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      Thanks Donnie!! I'll see if that helps, just strange that it's doing this all of a sudden, but I guess there has to be a 1st time. I appreciate your time!!
       
    • 70aarcuda

      70aarcuda Master Hoader of SBM FABO Gold Member

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      I usually use neutral as the adjusting point....put shifter lever in neutral ..plus shifter in neutral and adjust rod to fit.....
       
    • Donnie514

      Donnie514 Well-Known Member

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      Neutral is WRONG !!!!!
       
    • d55dave

      d55dave Well-Known Member

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      This is assuming a stock valve body, stock shifter and all correct linkage parts including the shift lever on the transmission. Some aftermarket shifters and valve bodies have different "throws" and have to have a corresponding shift arm to match. It is pest to do as you say and make sure the linkage drops in, then put both at the opposite end (first or third depending on shift pattern) and make sure that the linkage still drops in. Sometimes you have to weld up the hole in the shift arm and re drill it in a different spot to increase or decrease the amount of throw.
       
    • 1967GTX440

      1967GTX440 Life is Short so Enjoy your Ride!

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      I need to get under the car, right now I have another car parked above it - I'll swap them around this coming week-end. I also need to determine the mfg of the valve body that's in the car - thanks guys!
       
    • CudaFactHackJob

      CudaFactHackJob Well-Known Member

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      Sounds like a stuck valve leaving it in second.
       
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      • 1967GTX440

        1967GTX440 Life is Short so Enjoy your Ride!

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        Will that also make it feel like it's in PARK when I shift into 1st?
         
      • Donnie514

        Donnie514 Well-Known Member

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        OOOOH HELL YES, as I told you in two gears at the same time.
        Post #5
         
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        • 1967GTX440

          1967GTX440 Life is Short so Enjoy your Ride!

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          Big job? Should I just have the trans rebuilt??
           
        • Donnie514

          Donnie514 Well-Known Member

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          I might pull the pan, and if not many shavings in the pan have a good guy go thru the valve body. Thats not really hard to do.
           
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