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  1. #1

    Angry 93 Chevy 1500, 4l60e trans trouble

    I have a '93 Chevy Truck 1500, 5.0l, 4l60e trans. When

    starting out the trans. shifts fine 1st -4th gear, but

    absolutely no overdrive. Then a few miles down the road

    ,the first stop light, the trans then slams into second

    gear every time and only in second gear, all other gears

    are fine except for no overdrive. I have no lights on at

    all no C.E.L. no codes to pull. Any help would be greatly

    appreciated. Of course when the engine is shutoff for a few

    seconds, then start again trans will shift fine for a few

    stops , but no O.D. then start slamming into second again.

    Thanks for any ideas..

  2. #2


    i would check the tranny control module first, its mounted next to the ecm behind the glove box, had issues with my 93 yrs ago and that was the prob. 50 bucks from a wrecking yard,, just make sure its off the same kind of truck, 2 wd or 4 wd.. it will throw off your speedo.. but officer i was only doing 70... not 85.. lol

    just something to try first, u can even barrow one from a anther truck to test and see..

  3. #3


    I'm a little confused with your description, are you saying it shifts 1 - 2, 2 - 3, 3 to 4 ok?

    Then you add, there is no overdrive, 4th gear is the overdrive gear in the 4L60 trans.

    Are you saying it goes into 4th, or that it does not go into 4th?

    Now, the 2nd gear thing is definitely a problem, have you flushed the trans fluid lately? Maybe new fluid would fix the problem.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4

  5. #5


    Got my TCC valve from Sonnax, fixed same issue permanently.

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