C4 freewheels intermittently on startup, won't go into any gear, then will

Discussion in 'Transmissions' started by xpsnake, Aug 9, 2021.

  1. CA189HJN

    CA189HJN Robert Couse-Baker

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  2. xpsnake

    xpsnake Bruce

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    The first time it happened, I was 150 miles into a 300+ mile leg of the drive and only stopped for < 10 minutes at a gas station so it wouldn't have had much of an opportunity to cool down on a 100 degree day. I continued to drive the car for the season and it's parked for quite a while now. It'll be fun to tear it down eventually and figure out what happened.
     
  3. xpsnake

    xpsnake Bruce

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    Still haven't dealt with this, but another 1,000 miles of driving and it finally happened again last night. This time I tested my theory. When moving from park, it will not engage until I go all the way down to "1", then I can come back up to "D". I'm betting something is indeed sticky in the valve body.
     
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  4. Krazy Comet

    Krazy Comet Tom

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    Agreed, 99% morning sickness is related to high mileage/old age trans.
     
  5. xpsnake

    xpsnake Bruce

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    This transmission was rebuilt in 2016 by a reputable shop, but eventually I'll get in there and take a look.
     
  6. xpsnake

    xpsnake Bruce

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    Haha, man this thing. Happened again today. I'll probably deal with it in the spring. This time it didn't matter if I went up or down the gear selector, until I got the car off high idle and lowered the rpm, then she went right in.
     
  7. xpsnake

    xpsnake Bruce

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    Potentially related is that I have a "wah-wah-wah" cycling vibration on deceleration, off the throttle, that has appeared recently as well. Could be trans or torque converter. U joints checked out fine, pinion angle hasn't changed.
     

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