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  1. #1

    97 tj. Something snapped in the rear ??

    Coming home one night I heard a peculiar part break, at least thatís what I thought. Immedialty after I heard what to me was a busted u joint in the rear drive shaft.
    Sure sounded like it as it was speed related and very quick similar to the shaft turning.
    No problem. I just got around to replacing the u joints and test drive. Same noise as before. It is coming from the rear for sure but I noticed now that if I turn wheel right it gets very loud while turn left(swerving) it goes away. 🤷🏻*♂️
    Iím leaning now towards bad rear axle bearing ??
    Any thoughts ?
    97 4.0 manual. Stock.


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  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
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    6,184

    97 tj. Something snapped in the rear ??

    Jack it up on jack stands so the wheels are off the ground. Chock the fronts well. Put the trans on neutral and release the parking brake.
    Spin the wheels by hand to-determine the location of the noise.


    Title is attention grabbing.

    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 09-18-2021 at 08:19 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by JPNinPA View Post
    Jack it up on jack stands so the wheels are off the ground. Chock the fronts well. Put the trans on neutral and release the parking brake.
    Spin the wheels by hand to-determine the location of the noise.


    Title is attention grabbing.

    Never look down on anyone unless you are helping them up - Jesse Jackson
    Iíll try that. I did have it off ground and free wheeling for the ds removal but didnít notice anything however I wasnít looking for it per se. Iíll try that again. Seems the sideways force of turning makes it loud and silent the opposite opposing sideways force. And itís not there 100% of the time but itís something wrong while in motion.


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  4. #4
    Join Date
    Feb 2009
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    97 tj. Something snapped in the rear ??

    When turning the axels spin at different rpm. Right turn the left spins faster.
    Same for the carrier depending on what you have. The left spiders will turn faster on a tight turn.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  5. #5

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by JPNinPA View Post
    When turning the axels spin at different rpm. Right turn the left spins faster.
    Same for the carrier depending on what you have. The left spiders will turn faster on a tight turn.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    So what part in the diff would create that knocking. It def related to ds speed.
    I havenít tried swerving in N yet. I would think with power train in N might lead to a suspect.
    Maybe a busted pinion tooth?



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  6. #6
    Join Date
    Feb 2009
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    Re: 97 tj. Something snapped in the rear ??

    Did you link it to the diff?
    Do you have a locker?


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  7. #7

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by JPNinPA View Post
    Did you link it to the diff?
    Do you have a locker?


    Never look down on anyone unless you are helping them up - Jesse Jackson
    No locker. All stock wrangler sport


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  8. #8

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by TJS27 View Post
    No locker. All stock wrangler sport


    Sent from my iPhone using Jeepz.com mobile app
    The knocking is consistent with ds speed not so much axle speed. Could it be the bearing at the pinion? Although Iíve never rebuilt a diff I may have to 🤷🏻*♂️


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  9. #9
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    Feb 2009
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    Re: 97 tj. Something snapped in the rear ??

    Well you could detach the DS at the axel while you have it on stands and spin the wheels to separate shaft from axel.

    Just be careful to not pull the shaft out of the transfer case without a catch pan under the transfer case. Some cases will drain fluid when the shaft is out.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  10. #10

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by JPNinPA View Post
    Well you could detach the DS at the axel while you have it on stands and spin the wheels to separate shaft from axel.

    Just be careful to not pull the shaft out of the transfer case without a catch pan under the transfer case. Some cases will drain fluid when the shaft is out.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    Yea I replaced the u joints on R ds already. I didnít hear anything while spinning wheels off ground but I will again and see if I can find loose axle or other issues. I was convinced it was a u joint but apparently
    Not.


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  11. #11

    Re: 97 tj. Something snapped in the rear ??

    So Iím gonna crack open the rear diff. Pretty sure itís spider gears at this point.


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  12. #12
    Join Date
    Feb 2009
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    Re: 97 tj. Something snapped in the rear ??

    I had a shop change a internal axel bearing. They didnít put any or oil resistant loctite on the stud pin that held the stud in the carrier. The stud slipped out and cracked into pieces when it hit the housing.

    At that point I didnít have a operating rear.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  13. #13

    Re: 97 tj. Something snapped in the rear ??

    Quote Originally Posted by JPNinPA View Post
    I had a shop change a internal axel bearing. They didnít put any or oil resistant loctite on the stud pin that held the stud in the carrier. The stud slipped out and cracked into pieces when it hit the housing.

    At that point I didnít have a operating rear.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    Iím hoping itís just a messed up spider.
    I havenít gotten to it yet. But will this week.
    Itís drivable just annoying with the noise.
    Everything breaks eventually.


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  14. #14

    Re: 97 tj. Something snapped in the rear ??

    Well. Seems some bolt broke and then messed up a couple pinion teeth.
    97 tj. Something snapped in the rear ??-img_2619.jpg97 tj. Something snapped in the rear ??-img_2621.jpg
    Any idea what bolt could have broken ?



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  15. #15

    Re: 97 tj. Something snapped in the rear ??

    97 tj. Something snapped in the rear ??-img_2618.jpg97 tj. Something snapped in the rear ??-img_2617.jpg


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  16. #16

    Re: 97 tj. Something snapped in the rear ??

    Iím guessing putting force against the carrier when turning right made this teeth really chatter at driveline rotation speed. Whilst turning left force was against the opposite side hence no noise ?



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  17. #17

    Re: 97 tj. Something snapped in the rear ??

    Or maybe the opposite now that I think about it.


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  18. #18

    Re: 97 tj. Something snapped in the rear ??

    It would appear that both those bolt pieces are heads meaning two bolts broke ?


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  19. #19

    Re: 97 tj. Something snapped in the rear ??

    97 tj. Something snapped in the rear ??-img_2622.jpg


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  20. #20

    Re: 97 tj. Something snapped in the rear ??

    97 tj. Something snapped in the rear ??-img_2623.jpg
    Iím guessing it might be two bolts that hold the ring gear on the carrier. The bolts in this picture show two of them that look just like the sheared ones I posted


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