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1990 Chevy Transmission Question

Discussion in 'GM Powertrain' started by Air Force One, Jan 22, 2009.

  1. Air Force One

    Air Force One New Member

    1990 Chvey 1500, 305V8-Automatic, 130,000 miles: When I take off the engines revs really high, then eventually shifts into second/Third etc..After taking if for a long drive in the country and getting it warmed up quite a bit I stop, then take off again and it shifts ok? Probably Trans Oil has never been changed. I checked the level and had to add a quart to get it registered while "Hot"...any advice? I plan on changing Trans Oil. Do you think this will help? Thanks...*This truck sat for 6 years in a barn and its now my sons truck. Trying to make it right for him...:great:
  2. werty

    werty New Member

    I dont wanna slam second....SEARCH FOR THIS THREAD i started and see if it sounds the same at all???
  3. GaryL

    GaryL New Member ROTM Winner Platinum Contributor 1000 Posts

    Check the passenger side of the transmission for a vacuum modulator. If it is there (not sure about the 90 models) check the vacuum line from there up to the engine and make sure it is connected at both ends and not cracked or broken anywhere.
  4. Air Force One

    Air Force One New Member

    What Thread??

    what thread
  5. Air Force One

    Air Force One New Member

    can u link me the thread for my trans prob? Thanks
  6. GaryL

    GaryL New Member ROTM Winner Platinum Contributor 1000 Posts

  7. Air Force One

    Air Force One New Member

    1990 Trans

    Thanks for the link...my engine lite was on two weeks ago, and a throttle Position Sensor was the culprit. THEN it started the Transmission shifting problem. Engine lite is out. Advise? Thanks
  8. werty

    werty New Member

    my light was going on and off...intermittent.....so ..?i assume the new tps must work ok...hmmmm...
  9. werty

    werty New Member

    lemme guess no refunds no returns on electrical parts:grrrrrr:
  10. Crawdaddy

    Crawdaddy Moderator Staff Member Platinum Contributor 1000 Posts

    you said what year you have, but what model? This determines whether you have a TH700R4 or a 4L60E transmission. The troubleshooting for these transmissions is very different considering the symptoms you have described already.

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