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An Awful Screeching When I Let Off Gas Pedal?

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, Sep 4, 2019.

  1. Sep 4, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

    Gulf Breeze FL...
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    What could it be? Better question is - What exactly is it?

    I don't have much better description than in the title. Except might sound like a very dry bearing about to completely explode. The noise does continue when out of gear coasting to a stop then quiets as I go slower than about 5mph.
     
  2. Sep 4, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Does it only do it if the clutch pedal is pushed in or even when it's out? Possibly throwout bearing comes to mind.
     
    Rick Whitson likes this.
  3. Sep 4, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    So not there while the drive train is under load but is there when coasting...

    When coasting does it change any if you put it in gear but with the clutch in?
     
  4. Sep 4, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

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    Screech with clutch in or out, in gear or not in gear.

    The clutch and bearing are new - about 700mi.
     
  5. Sep 4, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

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    I really don't think so. Doesn't seem to be internal transmission.
     
  6. Sep 4, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    if the xfer case is in neutral?
     
  7. Sep 4, 2019
    SoCalNickG

    SoCalNickG Member

    Los Angeles, CA.
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    Can you post a video of the sound?
     
  8. Sep 4, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Well, we all know that new sometimes only means new, but if it quits it doesn't seem like the throwout bearing is the culprit.
     
  9. Sep 4, 2019
    Boyink

    Boyink Super Moderator Staff Member Sponsor

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    Are you in 2WD?
     
  10. Sep 4, 2019
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

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    Also, check the rear wheels to see if one of them is getting hot- you may have grabby brakes locking up one wheel when it's not being driven.
     
  11. Sep 4, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    Have you listened for under the hood noises? Alternator?
     
  12. Sep 4, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

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    I'll need a passenger to help with this. But since there wasn't a quick clear answer I'll check this.
     
  13. Sep 4, 2019
    Buildflycrash

    Buildflycrash Member Sponsor

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    Noise does not change with engine RPM. Like - screeching and put in neutral and rev engine = no difference in noise.
     
  14. Sep 4, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    But have you ruled out under the hood noise or is it just hard to tell where it's coming from?
     
  15. Sep 4, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    My bet is pinion bearing. Under power it’s pushing against one, under coast it’s pushing against the other.

    How’s the oil level in the rear?
    Any play in the pinion? Up/down/in/out?
     
    Glenn likes this.
  16. Sep 4, 2019
    47v6

    47v6 junk wrecker! Sponsor

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    Drum parking brake backer is rubbing on drum if you're moving.
     
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  17. Sep 4, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

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    Yes! Check for play in the rear output that would allow that to happen.
     
    Glenn likes this.
  18. Sep 4, 2019
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    Or nuts coming loose and letting it wobble at all.
     
  19. Sep 4, 2019
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Loose fan belt?
     
  20. Sep 4, 2019
    kenb

    kenb Member

    Detroit
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    I had a horrible squeal when downshifting. Turned out to be a loose fan belt.
     

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