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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.

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  1. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    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.
     
    Buildflycrash, Sep 4, 2019
    #1
  2. Glenn

    Glenn Kinda grumpy old man Staff Member

    Does it only do it if the clutch pedal is pushed in or even when it's out? Possibly throwout bearing comes to mind.
     
    Glenn, Sep 4, 2019
    #2
    Rick Whitson likes this.
  3. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    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?
     
    Howard Eisenhauer, Sep 4, 2019
    #3
  4. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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

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

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    I really don't think so. Doesn't seem to be internal transmission.
     
    Buildflycrash, Sep 4, 2019
    #5
  6. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    if the xfer case is in neutral?
     
    Howard Eisenhauer, Sep 4, 2019
    #6
  7. SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

    Can you post a video of the sound?
     
    SoCalNickG, Sep 4, 2019
    #7
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    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.
     
    Glenn, Sep 4, 2019
    #8
  9. Boyink

    Boyink Super Moderator Staff Member

    Are you in 2WD?
     
    Boyink, Sep 4, 2019
    #9
  10. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    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.
     
    Howard Eisenhauer, Sep 4, 2019
    #10
  11. Glenn

    Glenn Kinda grumpy old man Staff Member

    Have you listened for under the hood noises? Alternator?
     
    Glenn, Sep 4, 2019
    #11
  12. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    I'll need a passenger to help with this. But since there wasn't a quick clear answer I'll check this.
     
    Buildflycrash, Sep 4, 2019
    #12
  13. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Noise does not change with engine RPM. Like - screeching and put in neutral and rev engine = no difference in noise.
     
    Buildflycrash, Sep 4, 2019
    #13
  14. Glenn

    Glenn Kinda grumpy old man Staff Member

    But have you ruled out under the hood noise or is it just hard to tell where it's coming from?
     
    Glenn, Sep 4, 2019
    #14
  15. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    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?
     
    ITLKSEZ, Sep 4, 2019
    #15
    Glenn likes this.
  16. 47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    Drum parking brake backer is rubbing on drum if you're moving.
     
    47v6, Sep 4, 2019
    #16
    Glenn and ITLKSEZ like this.
  17. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Yes! Check for play in the rear output that would allow that to happen.
     
    ITLKSEZ, Sep 4, 2019
    #17
    Glenn likes this.
  18. Glenn

    Glenn Kinda grumpy old man Staff Member

    Or nuts coming loose and letting it wobble at all.
     
    Glenn, Sep 4, 2019
    #18
  19. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Loose fan belt?
     
    PeteL, Sep 4, 2019
    #19
  20. kenb

    kenb Cleverly disguised as a responsible adult

    I had a horrible squeal when downshifting. Turned out to be a loose fan belt.
     
    kenb, Sep 4, 2019
    #20
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