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Thread: Mysterious noise from the rear.

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    Default Mysterious noise from the rear.



    I have an odd noise coming from the rear of my truck. The best way for me to describe it is a squeaking noise. It sounds like it comes from both the driver and passenger side. It's either one side or the other never both. I generally hear it when I'm under 23mph while under 2000rpm. It seemed to come around when I replaced my rear axle which has and LSD so I was wondering if it could be the LSD. (additive was added to the gear oil) Also the same time I put on some JKS rear shackles so I was also thinking it may be those maybe if on side is under a little more force. I'm not really sure where to start. I drove to and from Moab as well to Montana with it and nothing as acted up or gone wrong. With that I'm assuming it's nothing terribly bad but just want to make sure.

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    Default Re: Mysterious noise from the rear.



    You comment on the sequence where it is present: under 23mph and under 2000rpm

    Does it remain if you push in the clutch (man) / shift to neutral (auto) to disconnect the motor from the drivetrain?

    Does it change if you're under power/coasting/decelerating?

    Trying to figure out if it's motor vibration or driveline vibration or chassis vibration related.

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    Default Re: Mysterious noise from the rear.



    Almost sounds like a binding U joint
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    Default Re: Mysterious noise from the rear.



    Lube the shackles?

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    Default Re: Mysterious noise from the rear.



    Paul previously posted:
    "Lube the shackles?"

    Was going to say the same... could be shackle bushings need some grease.
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    Default Re: Mysterious noise from the rear.



    I'm with Sam: u-joint. if the squeaking increases in speed until your certain speed then disappears, I'd say a u-joint is going out. that's what mind did before it got bad enough to start vibrating.

    J.

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    Default Re: Mysterious noise from the rear.



    Does the noise change when you apply the brakes?

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    Default Re: Mysterious noise from the rear.



    sounds like a ujoint going bad

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    Default Re: Mysterious noise from the rear.



    I'd defer to Sam's judgement, he's a pro. I only say shackles because it's in the OP.

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    Default Re: Mysterious noise from the rear.



    Jim previously posted:
    "Does it remain if you push in the clutch (man) / shift to neutral (auto) to disconnect the motor from the drivetrain?

    Does it change if you're under power/coasting/decelerating?"

    Not that I have noticed. I think it doesn't really matters it's always making the noise.


    Paul previously posted:
    "Lube the shackles?"

    Grease them before I put them on then 100 miles after like the instructions suggested.


    The StRanger previously posted:
    "Almost sounds like a binding U joint"

    So I am assuming it's on of the U-joints on the driveshaft. Would it just be wise to replace both at the same time instead of trying to decipher which one it is?

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    Default Re: Mysterious noise from the rear.



    dscowell previously posted:
    "So I am assuming it's on of the U-joints on the driveshaft. Would it just be wise to replace both at the same time instead of trying to decipher which one it is?"

    Yep

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    Default Re: Mysterious noise from the rear.



    What U-joints should I get? 1330? 1310? Something else?

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    Default Re: Mysterious noise from the rear.



    well considering those are the size numbers id say match the ones you have .....

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    Default Re: Mysterious noise from the rear.



    You "probably" have 1310's.

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