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Old 06-04-2012, 01:38 PM   #1
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Feeling a bump in rear when coming to a complete stop.

I have a 05 LJ. When I come to a complete stop i feel a bump a sec later coming from the rear and sometime feel the bump when accelerating from a complete stop.

I've called up a couple of dealers and this is what they said:
- grease the splines on the drive shaft, it might be binding up
- check the trans fuild, it might be low and your transmission might be trying to catch up.
- your u-joints might be bad

Anybody else experiencing this?

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Old 06-04-2012, 01:45 PM   #2
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Take your bowling ball outta the trunk.

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Old 06-04-2012, 02:00 PM   #3
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Like you said in your post, start checking out all the possible culprits, loose u bolts, pinion nut, bad u-joint, check the play in the drive shaft, play on the output of TC.
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Old 06-05-2012, 09:06 AM   #4
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Anybody else experiencing this?
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Old 06-05-2012, 10:26 AM   #5
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Grease the splines
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Old 06-05-2012, 10:29 AM   #6
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I had my exhaust hanger rust out and had a similar sound. Is the exhaust pipe connected to the jeep?
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Old 06-05-2012, 10:34 AM   #7
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Quote:
Originally Posted by Andrewf View Post
I have a 05 LJ. When I come to a complete stop i feel a bump a sec later coming from the rear and sometime feel the bump when accelerating from a complete stop.

I've called up a couple of dealers and this is what they said:
- grease the splines on the drive shaft, it might be binding up
- check the trans fuild, it might be low and your transmission might be trying to catch up.
- your u-joints might be bad

Anybody else experiencing this?
I have nothing to contribute to this thread, I just wanted to say that the title made me laugh so hard that I spit the coffee in my mouth on my screen and all over my desk and keyboard. . I hope you find a soultion to your problem.
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Old 06-05-2012, 10:46 AM   #8
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"I have nothing to contribute to this thread, I just wanted to say that the title made me laugh so hard that I spit the coffee in my mouth on my screen and all over my desk and keyboard. . I hope you find a soultion to your problem."

OMG your halarious. I never thought of it that way until you said that. Now its time to clean my screen of coffee to damn it.

I would say to jack up your rear end and spin each wheel back and forth in N to see if you can trigger the sound. If so, at least you'll know if it is at the axle level or u joints or maybe even something binding on one side in the brakes?
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Old 06-05-2012, 12:28 PM   #9
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Rear track bar? Tighten bolts
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Old 06-05-2012, 01:30 PM   #10
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ya got a bowling ball in your rear huh?
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Old 06-05-2012, 01:37 PM   #11
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On a serious note my yj, when accelerating i would get a loud thud from the rear and it was my transfer case.
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Old 06-05-2012, 07:15 PM   #12
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Quote:
Originally Posted by BladeMechanical View Post
I have nothing to contribute to this thread, I just wanted to say that the title made me laugh so hard that I spit the coffee in my mouth on my screen and all over my desk and keyboard. . I hope you find a soultion to your problem.
Now i'm laughing at the title.
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Old 06-06-2012, 09:28 AM   #13
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I removed the drive shaft (needed a couple of smacks with a rubber mallet), greased the splines and that seem to take care of the problem.
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Old 06-06-2012, 11:24 AM   #14
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I would put the jeep on stands, so the tires are off the ground. Then spin each wheel and stop them. If no noise, then I would take a large hammer and hit parts of each wheel, attempting to simulate bumps in the road or the stress of coming to a complete stop. If still no noise, I would start the jeep and let the tires roll in like 3rd gear for a minute or 2 to warm up. After warm (if it only knocks at low temp, don't do it when its warm) I would then hold down the brakes until the wheels stop. If you hear nothing it's very likely not anything having to do with the drive system. It is very possible though that it may only make the noise when the parts have the weight of the jeep on them.
Last, check shocks. If ANY oil is leaking out of any of the shocks, I would replace it. They need the oil for proper compression and lubrication. Without it the shocks will fail and can make the knocking noise. I just watched a video last night about different forms of knocks in cars, and most of it can apply to a jeep. I will try to find it


edit: here's the video

Hope I could help!
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Old 06-06-2012, 02:57 PM   #15
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Thanks. that's a helpful video.

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