1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

700r4 question

Discussion in 'Transmission & Transfer Case' started by robe338, May 22, 2020.

  1. robe338

    robe338 Junior Member

    Posts:
    23
    Likes Received:
    1
    Joined:
    Apr 5, 2019
    Location:
    Georgia
    First Name:
    David
    Truck Year:
    1977, 1984
    Truck Model:
    K10
    Engine Size:
    350
    Ive got a 700r4. I do not know much on the history of it. It has a nice firm 1-2 shift at about 20mph. It doesn't seem to want to do the 2-3 shift under load. I haven’t driven it far but I can get up to 45 (is the speedo is correct) and it still doesn’t shift while accelerating. If I let off the throttle it shifts. It seems like I read somewhere it should 2-3 shift around 35 - maybe thats wrong. I have not really tried to accelerate beyond the 45 mark - it seems ( by sound - no tach) its revving high and should have shifted by then. I haven't driven anything with a 700r4 in a long time. Maybe with gearing, tire size (perhaps the speedo is off some) its normal and I need to run it out a little further.

    Ive done a filter change and its got a corvette servo in it. Id say it shifted about the same with the stock servo. The axles should have 3:73 gears and the tires are About 34” tall.

    any ideas or suggestions.

    Thanks.
     
  2. 84 M1008

    84 M1008 Full Access Member

    Posts:
    337
    Likes Received:
    171
    Joined:
    May 11, 2018
    Location:
    New York
    First Name:
    Wayne
    Truck Year:
    1984
    Truck Model:
    M1008 K30
    Engine Size:
    6.2 diesel
    You need to adjust the throttle valve cable correctly or you will burn it up if you continue it drive it like that. Some people call it the kick down cable which is incorrect. It controls the shift points like a modulator on a TH400 only it is done mechanically.
     
  3. bucket

    bucket Super Moderator Staff Member

    Age:
    38
    Posts:
    21,279
    Likes Received:
    6,744
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    The TV cable is supposed to ratchet out automatically when you nail the throttle. It may be a good idea to verify actual road speed. It could also be a sticking governor. Or it's just normal for how the trans was built.
     

Share This Page