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Thread: Overdrive slipping....

  1. #1
    Full Member HawgHunter's Avatar
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    Overdrive slipping....

    Well, as the title states, my overdrive is slipping....

    It's a 97 C1500 with the 5.7 vortec. The fluid looked good when I changed it (and the filter) last month. But, as I'm driving down the Hwy at cruizing speed, my trans will slip back and forth in and out of overdrive????

    When I bought it from my brother-in-law he said he had just had the trans rebuilt a few months before. So, maybe a bad rebuild?

    I've also done a search on here and read that it could be some switch....but their problems differed a bit from mine....any help is appreciated

  2. #2
    Senior Member NonGoggleGuy's Avatar
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    What tranny is it? Also, when it slips, do you lose the speedometer?
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  3. #3
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    Is it slipping in and out of overdrive or lockup? drive it down the road at about 55 and lightly hold the brake and see if it stops, push on the brake only hard enough to disengage the cruise if it was on
    4 wheels move the body
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  4. #4
    Full Member HawgHunter's Avatar
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    Quote Originally Posted by NonGoggleGuy View Post
    What tranny is it? Also, when it slips, do you lose the speedometer?

    To be honest, I don't know how to go about finding out what tranny it is.

    I don't lose the speedometer thought. My RPM's jump up and down though.

  5. #5
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    the trans is a 4L60E and i would have to guess you are haveing a lockup problem. good possibility the converter didn't get replaced with the rebuild and the friction plate inside is toast.
    Last edited by mudseeker; 03-12-2009 at 06:59 AM.
    <----just your average 5.3

  6. #6
    Full Member HawgHunter's Avatar
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    Quote Originally Posted by mudseeker View Post
    the trans is a 4L60E and i would have to guess you are haveing a lockup problem. good possibility the convertor didn't get replaced with the rebuild and the friction plate inside is toast.
    Do you think that replacing just the friction plate would fix the problem, or just prolong it from happening again for a while?

  7. #7
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    friction plate is in the converter. whole converter would have to replaced if that's the problem.
    <----just your average 5.3

  8. #8
    Full Member HawgHunter's Avatar
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    I'll have to get out and do that test when my oldest daughter decides to get up.

    By running at 55 while slitly applying the brakes, what will this tell me if the problem does stop....?

  9. #9
    Senior Member
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    that it's torque converter lockup and not overdrive kicking in and out, should see less rpm diff. You could also change between drive and overdrive to help diagnose it
    4 wheels move the body
    2 wheels move the soul
    B.W.A.I
    Snow is a lot like religion and a lot like sex....you never know when you are going to get it!....or how much you will get

  10. #10
    Full Member HawgHunter's Avatar
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    Still haven't went out and tested it yet due to the rain....but I thought of something else that may be helpful....once the tranny warms up the slipping seems to go away.

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