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Old 09-23-2017, 01:10 AM
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Weird knock sound...

Weird knock sound...when going over certain bumps. I only hear this once in a while when I hit certain small but sharp bumps. It can be at any speed so far, and it certainly isn't bottoming out. Otherwise she rides fine. No bounce or sway like if the shocks were broke or shot. Where would you start? I can't tell if it's front or back from the sound. It is the driver side. These are stock shocks with about 70,000 miles on the Jeep.

Thanks in advance for any help.

Do you think it's time to upgrade to the Rancho 500X's I have in my cart on Amazon.

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Old 09-23-2017, 01:21 AM
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Oops, Typo... I meant Rancho 5000X shocks.

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Old 09-23-2017, 07:50 AM   #3
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The two places I'd start would be the top bolt on the shock to see if it is loose and maybe the ball joint.
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Old 09-23-2017, 08:02 AM   #4
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I recently had a similar knock and thought it was coming from under the vehicle. Turns out after a lot of investigating - it was the passenger side grab handle that had become just loose enough to cause the knock when the vehicle flexed on bumps or turns. May of may not be the cause of your issue of course.
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Old 09-23-2017, 09:29 AM   #5
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I hand the same thing, and found it to be the dreaded tailgate rattle/knock. Only certain imperfections in the road or driveway apron would bring it on. Good solutions posted on this site, the tape on the strike plate worked the best. i crawled under and torqued every nut/bolt in site, the tailgate was the issue. Remember years ago in the 80s' the hood hinge/pins caused a similar knock.
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Old 09-23-2017, 12:41 PM   #6
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I had a rattle in my 09 JKR and it was the parking brake cable had fallen off the actuator ring at the backing plate.
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Old 09-23-2017, 02:13 PM
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Wow, All stuff I hadn't even thought of. See why I asked the experts?!?! I think I will be taking off the shocks today and inspecting them all. Also doing the tighten every nut/bolt under there. It even sounded a little like it was something maybe in the driver door bin. But there is nothing in there. Or maybe something under the dash. I do recall seeing a radio control unit in the dash under the steering wheel which is just sitting there. Maybe I will secure it with a zip tie or similar.

Any other suggestions will help. Thanks Guys! My search continues... :-)
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Old 09-23-2017, 02:28 PM   #8
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sway bar links would be the first place id check, they make the same noise your describing when they fail. grab the sway bar and see if theres any play
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Old 09-23-2017, 10:32 PM   #9
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Wow, All stuff I hadn't even thought of. See why I asked the experts?!?! I think I will be taking off the shocks today and inspecting them all. Also doing the tighten every nut/bolt under there. It even sounded a little like it was something maybe in the driver door bin. But there is nothing in there. Or maybe something under the dash. I do recall seeing a radio control unit in the dash under the steering wheel which is just sitting there. Maybe I will secure it with a zip tie or similar.

Any other suggestions will help. Thanks Guys! My search continues... :-)
Check your axle housing bushings where the upper control arms mount.

https://www.quadratec.com/categories...l-arm-bushings

They will produce a random knocking sound if the molded rubber is separating from the bushing.

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Old 09-24-2017, 03:31 AM   #10
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In case you'd like to get a closer look of the upper bushings...

These control arm bushing looks bad to you? (lots of pics) - JeepForum.com

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Old 09-24-2017, 03:39 PM
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Thank you. Just got home from church, so I'll get on that this afternoon. Thanks for suggestions! :-)
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Old 09-24-2017, 05:23 PM   #12
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I hand the same thing, and found it to be the dreaded tailgate rattle/knock. Only certain imperfections in the road or driveway apron would bring it on...
This was my first thought after reading the OP. And there's different versions of the tailgate noise. I had two distinct sounds depending on the adjustments made.

As far as under the jeep I'd first start (as I think someone else may have mentioned) trying to grab parts and feel if anything is obviously loose. That'd probably be the best case scenario.
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Old 09-24-2017, 09:20 PM
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First five pics of my control arm bushings.
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Old 09-24-2017, 09:22 PM
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Old 09-24-2017, 09:24 PM
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Old 09-24-2017, 09:25 PM
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Old 09-24-2017, 10:09 PM
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The shocks are definitely bad. Took them off yesterday and checked. Top pin was looser than I thought it should be and the pin spins easily when loosened. Then I removed the bottom and pressed. I also pulled the rear and checked it. I hear air in both directions, and there is no where near enough resistance. I have bad shoulders and I could easily move them in and out. Same for the front and the rear. I am guessing the 32 inch tires that the previous owner installed may be too much for these itty bitty shocks.

The bump stops on two of the 4 tires will need to be replaced when I install my lift. May as well replace them all. The other two do have wear. I knew that it was played with before I bought it. I could tell from the scrapes on the skid guards. So If shocks are all that I need to replace and a few bump stops. I think I am in good shape.

The control arm bushings are starting to show signs of dry rot, as seen in the pics above. So I will keep a close eye on them. They are 9 years old after all.

I tightened all nuts and bolts. I didn't find any that I felt were loose except the top pin of the front shock.

I had my son help me test for play in the steering linkages. I feel no play in all but one ball joint. The upper on the right front has a very tiny amount of give, I can only feel it when my son turns the wheel back and forth quickly and then it is barely noticeable. When moving the tie rods themselves up and down, I feel resistance in their ball joints, but they do like to ride in the down position. This may cause them to bump metal to metal on a sharp bump. At least I can see how it could.

Time to order shocks. So Rancho RS500X or something else?

I am a 50 year old man with a wife and teenage daughter at home. I use the Jeep for work during the week and have about 300-600lbs of tools and supplies in the back. But on the weekend we play. We drive out on the beach to let the dogs play and run, we go fishing in the boat, so it will need to be able to pull a 15' aluminum boat. We have gone out on the dunes, to get to the beach for a picnic, I will be taking it hunting in the hills soon. So with all of this considered, do you think the RS5000Xs will serve me well? Or would you suggest something different? I do have back issues, so I want to have a fairly decent ride, not a Caddy, but not a lumber truck either! $200 bucks is about all I can afford right now, so these are right there at the top of the budget.
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Old 09-24-2017, 10:38 PM   #18
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My vote is on the bushings. I think M99 hit the nail on the head. When shocks are loose they knock and rattle pretty much all the time. The bushings however as M99 states will knock only when certain bumps are hit. It will get progressively worse over time though and will eventually start knocking with every bump.

It's hard to see from visual inspection whether they are bad or not. You really have to disconnect the control arm at the opposite end and flex it back and forth. It should feel tight and spring back when you let go of it. If there is little spring or feels loose then the rubber has separated.
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Old 09-25-2017, 12:11 AM
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I'll try that tomorrow after work. Thanks for sharing the procedure to test them. I appreciate it!
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O lllllll O- TrailMaster 3" coil lift kit, Skyjacker Front adjustable track bar, RS5000 shocks and steering stabilizer.
(o)_) (o)_)--o-)_) AEV Front control arm geometry correction bracket, AEV Procal Module.
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Old 09-25-2017, 02:21 AM   #20
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I'll try that tomorrow after work. Thanks for sharing the procedure to test them. I appreciate it!
The reason why I suggested the upper axle bushings is because I had one tear itself apart - and I couldn't find the random knock if my life depended on it. The bushings looked OK from the outside (because its encased) but one was ripped apart inside the axle mount where its pressed in.

As Bob Sanders said, it would only knock in certain bumps. Drove me nuts.

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Old 09-25-2017, 03:05 PM
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OK Thanks! What are the opinions about the shocks. Are the RS5000X going to be enough or go with the 7000 series for $229.00 shipped rather than $206 shipped for the 5000X? Or should I consider a different brand completely?
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Old 09-26-2017, 03:04 AM   #22
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OK Thanks! What are the opinions about the shocks. Are the RS5000X going to be enough or go with the 7000 series for $229.00 shipped rather than $206 shipped for the 5000X? Or should I consider a different brand completely?
Do you have a lift or are you stock? I like Rancho RS9000...

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Old 09-26-2017, 06:48 PM
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Stock suspension. Larger tires and rims than the label on the door. 255/75R17. Basically a 32" tire. Heavy Mud Terrain BF Goodrich tires. This is the shock part numbers for the 5000X model.
RS55326
RS55328

I would love to go with the 9000s, but the pocket book won't allow for that for a quite a few months. They are more than double the cost even with the current rebates.
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Old 09-26-2017, 06:54 PM
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I may do a 2.5" spacer lift in the future for a little more ground clearance and more aggressive look. But that is a future plan for now. I am married with 4 kids. :-)
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Old 09-27-2017, 11:04 AM
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Ordered the RS5000X shocks yesterday. They will be here today, and I plan to install them today after work! I will let you know if it helps with that knock sound.
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Old 09-28-2017, 02:43 PM
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My shocks arrived yesterday and I put them on last night. I took it for a quick test drive and it is riding much better than before. I could not tell if the knock is fixed, couldn't really drive too far. I have bad shoulders and they were hurting after installing the shocks. I will drive it out to the fire roads and see how it does.

It seems to have lifted the rig also. Maybe .5 to 1 inch. Is that possible?

The stock shocks are worse that I thought. Its no wonder the ride was bad. Judging from the sheer size difference between stock and new, it makes me wonder if the steering stabilizer could be bad. I did get it to pull to the left when I hit a decent bump with that left front tire. This also makes me wonder if the stabilizer may be bad.

Do you test the stabilizer the same way you do the shocks? It should have good resistance in both directions? Right?

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