Do I really need the vacuum modulator?

Discussion in 'Transmissions' started by scooper77515, Sep 3, 2009.

  1. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    What happens if I plug it and just use my shifter?
     
  2. 71gold

    71gold Frank Cooper Supporting Member

    Joined:
    Apr 9, 2002
    Messages:
    26,538
    Likes Received:
    2,907
    Trophy Points:
    978
    Garage:
    1
    Location:
    MACON,GA.
    Vehicle:
    '73 Grabber
    then you will not have a need for the kickdown lever either...:huh:
     
  3. yellow75

    yellow75 MCCI Oregon State Rep Supporting Member

    Joined:
    Jun 10, 2004
    Messages:
    4,777
    Likes Received:
    1,160
    Trophy Points:
    587
    Garage:
    2
    Location:
    Tillamook Oregon
    Vehicle:
    72 Maverick 1976 Maverick Stallion 2007 Shelby GT 500 2019 Ford F150 FX4 2023 Bronco
    I am sure PaulS is going to chime in and educate you about the harm it will do. :cry:
     
  4. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    Took kickdown lever off YEARS ago.

    The new vacuum modulator is adjustable. It kicks down just fine when I drive it in D.

    Most of the time, I use my floor shifter to go through the gears.
     
  5. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    Paul is the Transmission King!

    I wish I lived closer to him so he could work on my leaky C4.
     
  6. yellow75

    yellow75 MCCI Oregon State Rep Supporting Member

    Joined:
    Jun 10, 2004
    Messages:
    4,777
    Likes Received:
    1,160
    Trophy Points:
    587
    Garage:
    2
    Location:
    Tillamook Oregon
    Vehicle:
    72 Maverick 1976 Maverick Stallion 2007 Shelby GT 500 2019 Ford F150 FX4 2023 Bronco
    Yeah I have one of his ol yellar trannys sitting on my bench waiting for my custom built 4,200 stall 9 inch converter to get here and my engine then we will give it a test.
     
  7. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    Trying to get a job in Bend, Oregon, so maybe I will be close enough in the next few months to get a decent rebuild.:thumbs2:
     
  8. yellow75

    yellow75 MCCI Oregon State Rep Supporting Member

    Joined:
    Jun 10, 2004
    Messages:
    4,777
    Likes Received:
    1,160
    Trophy Points:
    587
    Garage:
    2
    Location:
    Tillamook Oregon
    Vehicle:
    72 Maverick 1976 Maverick Stallion 2007 Shelby GT 500 2019 Ford F150 FX4 2023 Bronco
    Well then you will only be about 500 miles from Paul. Is the job going to be a permanent thing? Just about all my family lives in the Bend area.
     
  9. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    If it happens, I plan on it being permanent.

    Hasn't happened yet...

    How is it around there? Is it worth selling everything I have to move and start over again.
     
    Last edited: Sep 3, 2009
  10. PaulS

    PaulS Member extrordiare

    Joined:
    May 3, 2004
    Messages:
    4,858
    Likes Received:
    11
    Trophy Points:
    0
    Location:
    Seattle area
    Vehicle:
    1966 Mustang, 1972, 73, 73 and 73 Mavericks
    The modulator reduces the pressure when it isn't needed.
    If you remove the modulator you will need to block the valve in the High Pressure position and then you can let the transmission shift from 1st to 2nd at around 50 mph and into 3rd at somewhere near 75 - 80 mph. (the 2-3 shift is controlled by the governor if the modulator is locked in the high pressure position.

    If you keep it in the low pressure position you can cause slippage in high load (full throttle) shifts.....

    You can modify the valve body to offer manual 1-2 shift and 3-2 shifts at any RPM but the 2-3 shift requires a manual valve body to have complete manual control.
    That requires a lot more mods to the valve body - and a new separator plate design.

    The modulator is a great way to get soft shifts when you want them and still get tire spinning shifts when needed.

    I am not going to get into the "downshift lever discussion again - it has all been said before and it comes down to if it wasn't needed then Ford would never have spent all that money installing it and the hardware associated with it.
     
  11. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    I didn't get rid of the kickdown just for kicks (hehe, get it, "kicks"). My intake is the Torker289 and it sets the carb at an angle and a bit higher than normal, so the kickdown rod was worthless at that point.

    Paul, once again, thanks for chiming in. Your knowledge is highly respected :Handshake
     
  12. facelessnumber

    facelessnumber Drew Pittman

    Joined:
    Oct 4, 2007
    Messages:
    3,710
    Likes Received:
    30
    Trophy Points:
    157
    Location:
    Memphis, TN
    Vehicle:
    '71 Grabber
    I think I had the same problem as you. My intake causes the carb to sit higher than stock and the linkage is a bit forward from where it's supposed to be. I was able to correct it though. I'll try and get you some pics... I bent the lever upward a bit, then took a flat piece of metal, (it was one of those things you put on valve cover bolts, to spread the pressure) I trimmed it down with a grinder, drilled a second hole, and bolted it to the end of the kickdown rod to lengthen it. Problem solved... I definitely prefer driving the car with that lever in place and functional.


    Edit: Pic added
     

    Attached Files:

    Last edited: Sep 5, 2009
  13. scooper77515

    scooper77515 No current projects.

    Joined:
    Jun 30, 2004
    Messages:
    14,672
    Likes Received:
    73
    Trophy Points:
    233
    Location:
    Issaquah/Grand Coulee, WA
    Vehicle:
    Fresh out of Mavericks
    I honestly do not notice a difference in driving with or without the kickdown lever. If I drive it in D, and stomp it, it always drops to 2nd gear.

    I use the adjustable modulator to control at what rpms it shifts when in D.

    Most of the time I shift through the gears manually.
     
  14. Matterick

    Matterick Matt Somerville

    Joined:
    May 12, 2007
    Messages:
    3,931
    Likes Received:
    47
    Trophy Points:
    123
    Location:
    Lake Stevens WA
    Vehicle:
    1973 Maverick 302, 1971 Maverick
    if you end up moving here, you could tow your car up to one of the meets next year and then bring back a yellow tranny with it :yup: or if you have to get it sooner, 500miles aint bad for an awesome tranny!

    i'm planning on putting in my 3-4 week notice to paul next month so i can get mine rebuilt! :yahoo:
     
  15. PaulS

    PaulS Member extrordiare

    Joined:
    May 3, 2004
    Messages:
    4,858
    Likes Received:
    11
    Trophy Points:
    0
    Location:
    Seattle area
    Vehicle:
    1966 Mustang, 1972, 73, 73 and 73 Mavericks
    Matt,
    I was just thinking about you. So when do you want it ready?
    Drop me a line with your phone number and I can call you - I have free long distance so it doesn't cost me to call. If you have the same deal you can reach me at my number listed below.
    206.725.0881
     

Share This Page