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Old 06-21-2013, 09:46 PM   #1
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Knock in the Rear

Anyone ever hear a knock coming from the back when the come to a stop? Just noticed the sound yesterday and not sure what it could be. Brakes?

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Old 06-21-2013, 10:25 PM   #2
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knock in ur rear

sounds like your u joints whats the mileage on ur jeep
i just had the same problem this last week

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Old 06-22-2013, 07:29 AM   #3
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105,000 so they probably are due. How did the job go for you?
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Old 06-23-2013, 01:02 AM   #4
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good! got rid of the clunking in mine , mine were worn so bad it broke part of the cap on the u-joint and that caused a ticking sound when i drove it, if it was ur brakes you would hear more of a grinding noise when u apply the brakes
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Old 06-25-2013, 09:27 AM   #5
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Ok, this may be a dumb question, but are you referring to the rear driveshaft u-joints? Or do the rear wheels have u-joints like the front? The knocking is getting more and more noticeable so I really need to nail this down and do the job this weekend.
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Old 06-25-2013, 02:22 PM   #6
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Any suggestions? Like I said, just looking to get this taken care of this weekend.
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Old 06-25-2013, 02:44 PM   #7
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No u-joints to the rear wheels, just rear shaft.

If you block your tires in the front and back so it will not roll, turn the key to on without starting it of course, then put it into Nuetral it will free up any pressure on the driveshaft. Climb under there and turn the shaft a little bit back and forth by hand. You should feel them pop/snap/bang/etc...

If your u-joints are completely tight in there and have no slop or play in them at all, jack up the back tires one at a time and spin it in Nuetral in both directions. Listen for anything to drag, grind, bind up or whatever. If you hear noise at one of the rear wheels when spinning it, pull it off and check the brakes out.

If all else fails and your u-joints plus your brakes are good check around the axle bolts and such to be sure nothing is moving. Check your shock bolts for slop in them, etc...
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Old 06-25-2013, 03:04 PM   #8
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Also check control arm and track bar bushings/bolts.
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Old 06-25-2013, 04:56 PM   #9
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A low pitched clunk makes me think you have a control arm that is making noise, perhaps from a bad bushing. Less likely, maybe a loose track bar bolt or bad bushing. Without hearing it, a clunk probably wouldn't make me think u-joint.
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Old 06-25-2013, 05:36 PM   #10
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Anyone ever hear a knock coming from the back when the come to a stop? Just noticed the sound yesterday and not sure what it could be. Brakes?
I had a low clunk..... clunk ..... clunk when coming to a stop. Replaced rear brake shoes and adjusted the new ones. Sound went away. They had an odd wear pattern. 7k miles later and still working and wearing with normal patterns.
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Old 06-25-2013, 07:23 PM   #11
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Thanks for the advice everyone. I think I'll start by checking rear brakes and all suspension connections as recommended, since it doesn't cost anything to look over current parts. I believe the brakes are close to due anyways, so I may end up doing them no matter what. I was under the rear for quite some time when I did my fuel pump, and the only thing I noticed was some rusting on the shocks, but I'll have to look more closely at everything else. Thanks again! I'll report back with what I find.
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Old 06-26-2013, 07:53 AM   #12
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Ok so I got under my jeep today and felt up the rear suspension. My upper control arms are loose where they connect with the trac bar. Is this normal or should I tighten up the bolts so there is no movement by hand? Also, could this be the cause of a knock?
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Old 06-26-2013, 09:40 AM   #13
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It also seems that my driver's side rear tire is frozen to the drum. I couldn't get the tire off. Any suggestions there?
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Old 06-26-2013, 09:53 AM   #14
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It also seems that my driver's side rear tire is frozen to the drum. I couldn't get the tire off. Any suggestions there?
make sure it's off the ground?

just kidding - my brother in law had a flat once and it was stuck on the axle pretty bad. Just got behind it and kicked it off.
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Old 06-26-2013, 10:03 AM   #15
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Ok so I got under my jeep today and felt up the rear suspension. My upper control arms are loose where they connect with the trac bar. Is this normal or should I tighten up the bolts so there is no movement by hand? Also, could this be the cause of a knock?
Your upper control arms are connected to the frame and the top of the axle, but there should not be any movement. If the bolts are loose, then yes tighten them, but there's a good chance you probably need new bushings. This is probably the knock you are hearing.
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Old 06-26-2013, 12:20 PM   #16
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make sure it's off the ground?
I knew someone would ask that! Yes it was completely off the ground. I guess I'll use a little more elbow grease.

The bottom of my upper control arm connects to the trac or sway bar, not the rear axle. When sitting on level ground I can move the lower part of that connection with ease. You think this indicates the bushing needing to be replaced but not the entire control arm?
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Old 06-26-2013, 12:25 PM   #17
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Unless a previous owner really screwed up your suspension, your upper rear control arm connects between the top of the axle & frame. The upper control arm does not connect to or even touch the track bar or antiswaybar.
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Old 06-26-2013, 12:47 PM   #18
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Maybe it wasn't my upper control arm? I'll have to take a picture later and post it. To be continued...
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Old 06-26-2013, 09:26 PM   #19
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Ok, so these are the pics I was able to take earlier. The connections I'm touching is what's loose at the bottom where it connects to the anti-sway bar. Looks like that's the stabilizer bar link. Is that suppose to be loose? If not, what's the correction? Replacing the entire component or just a bushing?
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Old 06-27-2013, 02:18 PM   #20
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Anyone know what I'm touching in those pics above?
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Old 06-27-2013, 03:28 PM   #21
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Those are your swaybar links. They connect the sway bar to the frame. They move with it up and down.
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Old 06-27-2013, 04:33 PM   #22
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Ok great. Now, when my jeep is on level ground and the suspension is "relaxed" so to speak, should the link be loose where it connects with the sway bar?
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Old 07-25-2013, 02:50 PM   #23
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Just refreshing this thread. Never got a clear answer on this. I'm able to move my rear sway bar up and down by hand. Is this normal? It just doesn't seem right and I'm getting some noise from the rear when I go over bump. Should I tighten the bolts connecting the sway bar to the sway bar links? Or is it suppose to be loose like that?
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Old 01-31-2014, 01:57 AM   #24
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Quote:
Originally Posted by apannone View Post
Just refreshing this thread. Never got a clear answer on this. I'm able to move my rear sway bar up and down by hand. Is this normal? It just doesn't seem right and I'm getting some noise from the rear when I go over bump. Should I tighten the bolts connecting the sway bar to the sway bar links? Or is it suppose to be loose like that?
QUOTEnnone;3905629]Osegreat. Now, when my jeep is on level ground and the suspension is "relaxed" so to speak, should the link be loose where it connects with the sway bar?[/QUOTE]

swayBarShouldNotBeLoose
if it is your brakes then it will only happen once you have come to a stern stop and then once you proceed, you will then hear a thunk in the rear; this is your rer brake pad grabbing (common, not a damaging problem though.

what i have and cant figure out is i have a violent thunk that seems like the rear end just fell off and this happens throughout the gears the same, more so when making a turn under power and only under power does it make this noise. i have replaced the entire rear axle and came out with the same problem (thought for sure i had it licked)

any suggestions please txt Kevin 951 807 9332
2003 wrangler sport 6 cyl auto 33s with what i believe is the aussie lockers inside my
dana 35 rear end.
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Old 02-01-2014, 08:44 PM   #25
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If you are hitting bumps and hearing noises then your sway bar could be your problem.

Found that my problem with the violent clunking was the aussie style lockers were slipping trying to handle the 33 inch mudders. Replaced them with spider gears and all is well again and driveability is so much better.
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Old 02-01-2014, 08:46 PM   #26
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Aussie locker dana 35
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