Rotational sound when accelerating

Discussion in '80-Series Tech' started by Rhkwon, Jul 12, 2018.

  1. Rhkwon

    Rhkwon

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    When I'm on the freeway anywhere from 55 to 80 mph when I give some light throttle (transmission stays in overdrive and does not downshift) I can hear a rotational sound almost like something is out of round. It's not a grinding or howling sound. I can definitely hear it and feel it in the accelerator pedal. When I let off the accelerator it goes away and does not make the sound at a steady speed.

    Any ideas?
     
  2. dbenke

    dbenke

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    Sounds like the torque converter lock up.
    go on Amazon, order some "shutter stop" (2 oz) and see if it goes away.
    Temporary fix, but will last for ten or so thousand.
     
  3. BILT4ME

    BILT4ME

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    If itsi right at that point between acceleration and deceleration, it could be a rear output bearing on the transfer case.

    However, lube your ujoints and slip yokes first.
     
    Dave 2000 and UltraFJ40 like this.
  4. Rhkwon

    Rhkwon

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    Just want to be clear on the symptom. The car downshifts in all gears just fine. Only at highway speeds when I give light throttle to mildly accelerate (and therefore not to downshift) does this sound appear.

    So maybe it has something to do with the rear output bearing? And how difficult is this to repair?

    Thanks guys.
     
  5. baldilocks

    baldilocks Battle Ground, WA GOLD Star

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    Under those conditions, the torque converter will unlock to aid in the mild acceleration you are asking for. Go out and get it up to cruise speed and then put the gas pedal down more aggressively, it should shift down.

    Perhaps the TC is beginning to fail internally making the noise your heard.
     
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