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  1. #1

    Default 1990 Chevy Transmission Question

    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...

  2. #2


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

  3. #3


    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.

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  4. #4

    Default What Thread??

    Quote Originally Posted by werty View Post
    I dont wanna slam second....SEARCH FOR THIS THREAD i started and see if it sounds the same at all???
    what thread

  5. #5


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

  6. #6

  7. #7

    Default 1990 Trans

    Quote Originally Posted by GaryL View Post
    Thanks for the 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. #8


    my light was going on and ..?i assume the new tps must work ok...hmmmm...

  9. #9


    lemme guess no refunds no returns on electrical parts

  10. #10


    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.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

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