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Thread: Knocking on the rear end.

  1. #1
    Fresh Catch
    Join Date
    Mar 2020
    Location
    San Jose
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    1

    Knocking on the rear end.

    Hello Jeepers,
    Has anyone experience knocking on first gear acceleration. It is not that loud but I can hear and feel it. I only hear the knocking sound when Accelerating from full stop. It is intermittent. It is smooth most of the time. My Jeep is about 3-4inch lift and has 35” tires. Any thoughts?


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  2. #2
    Hooked Cousin Clyde's Avatar
    Join Date
    Apr 2019
    Location
    Colorado
    Posts
    152
    My stock exhaust pipe started rattling / knocking somewhere towards the rear when I would start accelerating and then stop as I got up to speed. Couldn’t find out where it was making contact. It was definitely bent from impacts. Ripped in out and threw in a Dynomax exhaust. No more knocking sound.


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  3. #3
    Hooked Cousin Clyde's Avatar
    Join Date
    Apr 2019
    Location
    Colorado
    Posts
    152
    Of course your Jeep could also be near ‘detonation’

    I used to live in a Chevy express cargo van that always had this cylinder misfire code. One time, this guy in North Carolina warned us that we might be in for a detonation.

    Better be careful, bud.
    IMG_0572.JPG


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  4. #4
    Nothing but a Thing QuicksilverJK's Avatar
    Join Date
    Apr 2016
    Location
    Reno NV
    Posts
    1,406
    I would recommend taking a close look at all your U Joints. Could also be hearing a worn out control arm bushing that is allowing some axle wrap from takeoff


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