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Weird noise from rear end, thunk thunk thunk


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11 replies to this topic

#1 subieman

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Posted 20 February 2008 - 12:54 AM

I have a mystery noise and for the life of me I can't figure out what is causing it.

It only does it after I have been driving for a few miles. When it's cold there is no noise. Its coming from the passenger rear. It sounds like a thunk thunk thunk, while driving straight, as soon as I turn the noise changes to a grinding sound. When I put it into 4wd the noise stops. It's louder while decerating.

I have pulled the wheel off and the drum looked at the brakes... everything looks fine.

Could this be an axle or wheel bearing?

It's on a 88 GL w/ 235k

#2 Durania

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Posted 20 February 2008 - 01:00 AM

Did you check and see if the wheel moved when grabbed at the top and bottom?

#3 [HTi]Johnson

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Posted 20 February 2008 - 01:15 AM

Drive shaft?

#4 Durania

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Posted 20 February 2008 - 01:58 AM

Johnson']Drive shaft?


Good idea, could be U-joint on it's way out.

#5 subieman

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Posted 20 February 2008 - 10:17 AM

Good ideas! Keep them coming! :)

#6 bratsrus1

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Posted 20 February 2008 - 10:21 AM

Hi This is Jerry, your noise is a loose lug nut. It happen to me please check them. Thanks Jerry

#7 desertsubaru

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Posted 20 February 2008 - 10:31 AM

Check your rear diff oil?

#8 glkiller

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Posted 20 February 2008 - 01:44 PM

good call on the lug nut, my wife had a wheel fall off after a certain large tire shop changed the tires. if the noise changes very dramatically like that it prob is lug nut. I find most thunks are axles, and most grinds are bearings though if those lugs are tight.

#9 Buddy

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Posted 20 February 2008 - 02:20 PM

could be a bone dry bearing. check them cuz i had the same exact sound and it was a dry bearing. the solution to that is simply repack and ur good to go.

#10 one eye

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Posted 20 February 2008 - 05:56 PM

could be a bone dry bearing. check them cuz i had the same exact sound and it was a dry bearing. the solution to that is simply repack and ur good to go.


That's what I think I had one go out in eastern Wa and drove all the way home with a thump thump thump. sounds just like what I had going on.

Jeff

#11 subieman

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Posted 20 February 2008 - 11:25 PM

I think I'm leaning toward the bearing idea. The lug nuts are tight and so is the castle nut (those where the first things I checked)

Just a repack or should I replace the bearing?

#12 Caboobaroo

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Posted 20 February 2008 - 11:37 PM

Pull the bearings out and check to see if there's any discoloration or marks on them. If there is, replace but if not, repack and try it again. Basically a bearing pack is labor but the bearing replacement is kinda expensive. Did it on my RX and the bearing retailed at like $120:eek:




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