Semi-Automatic-Any Made

Discussion in 'Transmissions' started by roger628, Sep 8, 2006.

  1. mavman

    mavman Member

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    reason you had problems was the same reason I did. The valve bodies were nothing more than a regular C4 valvebody that had been modified....slightly....drive was still drive 2nd was 2nd (took off in 2nd just like any other stock VB) and low was low. Stayed in low as long as you left the lever in the position, same for 2nd. The one I had was just a valvebody with a shift kit (bought it as a manual valve body)...but it would shift 1-2-3 in the drive position (shifted HARD, but shift it did). That one was from a reputable trans shop out on the west coast, IIRC. Still have it somewhere.

    I can build them at home now, no need to spend $100+ on one. Same for a powerglide.
     
  2. Andysutt

    Andysutt '72 Comet GT

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    IIRC that valvebody is the one in the mustang now...
    Im not to much worried about a full manual valvebody as long as it shifts hard and shifts when you tell it 2 :)
     
  3. mavman

    mavman Member

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    Nope the one in the Mustang is one that Old Guy built here at home. We had some problems with the PA full manual that WAS in it (sticking valve, IIRC) and dad built another VB...problem solved. Justin went 8.98/112 with it earlier....make sure to tell my bro next time you talk to him that it finally broke into the 8's.

    that original PA manual VB was in my yellow car when I ran a C4 in it. The entire transmission came out & went into the Mustang, and, of course I went to the powerglide.
     
  4. Andysutt

    Andysutt '72 Comet GT

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    Congrats on the 8.98 in the car.
    Im hoping to have mine up there in a few weekends, but of course I may have the luck of it and the season be over with. :(
    Thats ok... put mufflers on it, take it to the new strip in Beebranch and show up some highschool kids
     
  5. mavman

    mavman Member

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    Let me know when...I'd like to be there to personally spank your arse in my truck!

    Just joshin' ya. I need to go up there & check it out. From what I hear it's mostly street car stuff....ricers and the like. No race cars (must have tags, insurance, etc). Otherwise I'd have had the Junkstang up there already.

    Kinda makes me wish I'd have kept the SVO. Well, maybe not.
     
  6. Andysutt

    Andysutt '72 Comet GT

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    Yea, it's all 100% street legal... which my car is other than mufflers. hehe
    If you wanna run me in your truck... bring it... it'll be fun.
    I heard the winner of one day was a 3/4 Ton Duramax diesel truck... lol so I think I got him covered. All he has was exhaust and a air filter, nothing else.
    So if thats the case... I think we got 1st and 2nd place taken care of ;) hehe

    We should really go check it out sometime tho
     
  7. mavman

    mavman Member

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    Sweet! A duramax wins LOL. Thats hilarious...reminds me of Newport last time I went. I was the fastest car there BY FAR and at first they didn't want to let me run. LOL. I bet I could tags & insurance on the Maverick, trailer it to the gas station, and drive it to the track. Does that count as a "street" car? haha

    OT, I see where the 2007 Hot Rod Power Tour will end in Little Rock. I want to go check it out. http://www.hotrod.com/upcomingevents/hdrp_2007_power_tour/
     
  8. Andysutt

    Andysutt '72 Comet GT

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    Yea, im goin on the power tour w/ the Comet
    meeting up in memphis and coming to LR

    And if you want to trailer your car up there... no reason to take it to the gas station. :)
    I got family that lives in Damascus... we can drop em off there, which is what i plan on doing since i run the 4.62 gears

    I gotta get a set of 3.00's for the power tour tho
     
  9. mav6977

    mav6977 Member

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    Semi_auto

    Here are the facts for those who want to know: The semi-auto
    was only available behind the 170 with all three gear ratio's-
    2.83, 3.08 (shown as the standard ratio with that trans) and
    3.20. The tag code was PEG-A. The shop manual supplement
    has this to say: " The new semi-automatic transmission is a
    manually operated power shift transmission which does not
    require a clutch pedal. The new transmission is similar to the
    1969 C4 fully automatic except for changes in the control valve
    body and that the vacuum diaphragm, throttle rod, governer, and
    inner and outer downshift lever assemblies have been eliminated.
    Other changes include new manual linkage and oil pan and control
    valve body replacement procedures. The majority of the changes
    in the new semi-automatic have taken place in the control
    valve body. Since the new transmission must be shifted manually
    the line pressure coasting boost valve, intermediate servo
    accumolater valve, throttle control valve, throttle pressure
    booster valve, throttle downshift valve, two ball shuttle valves,
    and intermediate servo accumulator rubber check valve have
    been eliminated. The manual valve detent plunger, spring and
    retaining pin have also been eliminated. New features include
    a manual valve and a leaf type detent spring and roller assembly
    for better control of the valve position and improved flow charac-
    teristics. A new 1-2 transition valve for improved 1-2 upshifts
    and a new low servo modulator valve for improved 3-1 downshift."

    My 03/69 brochure lists the semi-automatic, but my 08/69
    revision does not. I don't know what the cost for the optional
    transmisison would have been since my earliest Armchair
    Estimator guide is from 09/22/69 after the option had been
    dropped apparently. The 08/69 revision is for the late 70 models
    because it shows the column mounted key switch and no
    horn ring. But that ladies and gentleman is basically all I have.
     
  10. don graham

    don graham MCG State Rep

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    wonder if it was too expensive for the lowly maverick.:hmmm:
     
  11. mav6977

    mav6977 Member

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    Semi-Auto

    >Well, like a said, as soon as I start to buy my Marti
    reports for the 12 cars I own (well, he only has info
    for ten really) I'll spend the extra dough to ask the
    question as to how many semi-auto's were made. I'll
    start after Christmas when I have money left over.
     
  12. awannabegrabber

    awannabegrabber Always Learning

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    talk about brought back from the dead
     
  13. newtoford

    newtoford Member

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    sounds like a really fun trans to drive. would it b possibl to convrt any c4 trans to work this way? i'd really like to do mine like that after i get a floor shifter in.

    reminds me of the lightning rod automatics that came in 1980's hurst oldsmobiles even though i never had the chance to drive one of those myself either.
     
  14. dmhines

    dmhines Dixie Maverick Boy

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    Sure ... just install a manual valve body ...
     
  15. newtoford

    newtoford Member

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    adding something new to my wish list everyday:)
     

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