700R4 Transmission Pressures

Discussion in 'Transmission & Driveline Topics' started by Bandit723, Nov 20, 2020.

  1. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    Just installed a rebuilt 700R4 so throwing caution to the wind i hooked up a pressure gauge just so i am not flying blind while adjusting the TV cable. I did have to adjust it some as it changed from the old one i pulled out. Came up with these readings at idle.

    Park - 120 psi
    Rev - 200 psi
    Neutral - 120 psi
    OD - 120 psi
    3rd - 120 psi
    2nd - 200 psi
    1st - 200 psi

    So i am not sure if these readings are to high while idling? with the TV cable slack psi in park goes down to 75 i am sure i can adjust it out to 90 psi if needed.
     
  2. camaro71/holland

    camaro71/holland Veteran Member

    Messages:
    1,492
    Likes Received:
    195
    Joined:
    Aug 27, 2003
    Location:
    The Netherlands
    Do a min/max pressure test and check the numbers corresponding with your VB type. 700R4 Transmission Pressures.jpg
     
  3. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    Thanks! looks like i am too high right off the bat
     
  4. camaro71/holland

    camaro71/holland Veteran Member

    Messages:
    1,492
    Likes Received:
    195
    Joined:
    Aug 27, 2003
    Location:
    The Netherlands
    Too high is always better than too low with a 700 or 200-4r. Both have a safety feature built in so in case of a TV cable failure the pressures immediately jump to max pressure and saves the transmission from self destruction.
     
  5. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    Just for prosperity here are the readings off the 700R4 i just pulled. Must have been ok as the trans works fine but shifted a little mushy. The one i rebuilt does have a shift kit and corvette servo.

    Park: 90 psi
    Reverse: 130 psi
    Neutral: 90 psi
    OD: 90 psi
    Drive: 90 psi
    2nd: 180 psi
    1st: 180 psi
     
  6. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    Well futzed with the TV cable got park idle down to 90 psi rev is 150 psi and 1st and 2nd is 180 psi took the car out and running at about 2000 rpm's with the throttle cracked a bit and in OD it is 120 psi think it is good. Trans shifted solid think i am good. TV cable extended at idle gets me 210 psi.
     
  7. camaro71/holland

    camaro71/holland Veteran Member

    Messages:
    1,492
    Likes Received:
    195
    Joined:
    Aug 27, 2003
    Location:
    The Netherlands
    If it's all doing what it should and it feels good, then your good.
     
  8. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    I agree thanks for the help. Might play around a bit just as a learning exercise good to know a low trans pressure is bad.
     
  9. 77 cruiser

    77 cruiser Veteran Member

    Messages:
    587
    Likes Received:
    36
    Joined:
    Nov 17, 2006
    Location:
    Frostbite Falls MN
    Do you have the correct geometry on the carb for the TV cable?
     
  10. Bandit723

    Bandit723 Veteran Member

    Messages:
    3,531
    Likes Received:
    621
    Joined:
    Oct 1, 2016
    Location:
    Waupaca WI
    Yes it is correct. It is a Holley setup
     

Share This Page