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Old 04-03-2014, 07:52 PM   #1
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Lumpy Ride Help

As I'm driving down the road at about 25 MPH it feels like I'm riding over a bunch of mounds ( rolling bumps) evenly spaced apart. The entire jeep bobs up and down. As I accelerate the "bobby" sensation is still present but not as noticeable. In fact, you can look in the rear view mirror and see the spare bobbing up and down on the back as well. I have a 3.5" Rubicon Express (RE) Super Flex kit with RE Shocks and adjustable track bars (front and Rear) and upper control arms. I also have an RE CV drive shaft. The tires are 33x12.5x15 on Mickey Thompson Classic IIIs.

I've tried every option I could think of to alleviate this problem. Such as alignment, tire balancing, drive shaft pinion angle, new wheels and tires, and I even measured the wheel base to make sure its the same on both sides and in an "x". Completely frustrated. Ive been trying to tackle this problem for over two months and have ran out of options. Im to the point I want to sell it and buy a truck.

Here is a pic to maybe help in analyzing the issue.
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Old 04-03-2014, 08:10 PM   #2
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On more thing to note: The right side sits about an inch higher than the left. Not at all noticeable but could be a culprit to the poor ride.

Are the Rubicon Express shocks garbage? Should I try a different brand?
Any help is much appreciated!

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Old 04-03-2014, 09:08 PM   #3
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That problem could be from your shocks and/or excessive tire pressure. Which RE shocks, Monotubes or Twin-tubes? My bet would be RE's too stiff Twin-tube shocks. And what tire pressure?
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Old 04-03-2014, 09:15 PM   #4
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I went with the Twin Tubes. Supposedly they have a softer ride. Not the case so far.
Using 30 PSI all the way around.
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Old 04-03-2014, 09:17 PM   #5
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does the interval of the lump decrease as your speed increases? Like does the lumping get faster the faster you go?
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Old 04-03-2014, 09:20 PM   #6
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Yes the "lumping" increases as I accelerate. But after about 50MPH its not very noticeable.
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Old 04-03-2014, 09:26 PM   #7
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None of your wheel are out of round or anything like that? I see that you stated that you've changed the tires and wheels so that probably isn't it. I don't know a lot about the technical stuff under a Jeep but in order for there to be a lump of increasing frequency relative to speed then something is out of whack with the rotation of the wheels, maybe the hub is bent or something.
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Old 04-03-2014, 09:36 PM   #8
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It could very well be a bent hub. I did just have to replace the axle seal on the rear drivers side. Hmmm now you got me thinking. However that'd be an expensive fix. Id have to buy a new axle shaft.
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Old 04-03-2014, 09:38 PM   #9
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30 psi is excessive for 33" tires carrying a vehicle with the weight of a Wrangler. 26 unloaded 28 loaded is more appropriate.

RE's Twin-tubes are noriously stiff riding.
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Old 04-03-2014, 09:43 PM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
30 psi is excessive for 33" tires carrying a vehicle with the weight of a Wrangler. 26 unloaded 28 loaded is more appropriate.

RE's Twin-tubes are noriously stiff riding.
Ill put 27 PSI in the tires ASAP.

The shocks came with the lift. I was hoping they would soften up a bit. But Ive put about 3,000 miles on them. Don't think they're getting any softer.

Did you read about the possible bent hub?

Id like to narrow down one or the other (hub or shocks) before spending money to fix something that's not really broken.

Thanks for the Help!
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Old 04-03-2014, 09:48 PM   #11
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One thing you could do is jack up the front and rear of your jeep put it on jack stands or some solid pieces of blocks pull all four tires off put it in gear and with it in gear hop out and look at all your hubs you will be able to tell if you have a bent axle shaft or not. Being as though you just replaced your seals could very we'll be the culprit. Good luck if your gonna fork out the money for new I would try to find ya a nice set of chromoly axle shafts they are nearly indestructible. Good luck.
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Old 04-03-2014, 09:52 PM   #12
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Thats a good idea, jack it up and see if you can see which wheel or wheels might be the culprit by turning them manually and see which one bobs.
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Old 04-03-2014, 09:56 PM   #13
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Great advice! I'll do it this weekend. Thanks for all the help!
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Old 04-03-2014, 10:01 PM   #14
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Good luck, keep us updated so we know how it goes.
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Old 04-04-2014, 05:37 PM   #15
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It is confirmed! I do have a bent hub. Now that I know the problem, its gonna cost about 200 to get a new axle shaft and have a new seal, bearing, and race pressed on
At least I know the problem now. This explains why the axle seal started leaking as well. Thanks for the help!
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Old 04-04-2014, 06:21 PM   #16
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Glad you found problem hopefully it dosent run to much to get it all squared away but in my journeys I have found just about everything to fix a jeep usually costs about 200
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Old 04-04-2014, 06:21 PM   #17
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It is confirmed! I do have a bent hub. Now that I know the problem, its gonna cost about 200 to get a new axle shaft and have a new seal, bearing, and race pressed on
At least I know the problem now. This explains why the axle seal started leaking as well. Thanks for the help!
I think you may be confused. Your rig will only have hubs on the front axle. The hubs are fully enclosed and are replaced as a single unit.

Is the problem perhaps a damaged rear axle shaft? If so, then there are no hubs.
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Old 04-04-2014, 06:24 PM   #18
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That's great, its always satisfying to finally find the problem.
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Old 04-04-2014, 07:26 PM   #19
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I think you may be confused. Your rig will only have hubs on the front axle. The hubs are fully enclosed and are replaced as a single unit. Is the problem perhaps a damaged rear axle shaft? If so, then there are no hubs.
Yes, it's the axle shaft that's bent. The place where you attach the wheel, where the studs are located is bent. I ordered some G2 shafts from 4wd.com for just under $300 shipped. They come w the bearings, seals, studs, and locking collars too!
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Old 04-04-2014, 07:49 PM   #20
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Yes, it's the axle shaft that's bent. The place where you attach the wheel, where the studs are located is bent. I ordered some G2 shafts from 4wd.com for just under $300 shipped. They come w the bearings, seals, studs, and locking collars too!
Good choice buying upgraded axle shafts.
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Old 04-04-2014, 08:22 PM   #21
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How did you finally determine It was a bent axle. I have a very simular issue. But my seems to be more of a vibration at slower speeds witch smooths out when I get up above 45 mph.
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Old 04-05-2014, 07:47 AM   #22
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How did you finally determine It was a bent axle. I have a very simular issue. But my seems to be more of a vibration at slower speeds witch smooths out when I get up above 45 mph.
Jack the jeep up. Put rear axle on jack stands. Remove rear tires and drums. Start jeep. Put in gear. Watch axles turn and look for a "wobble". They both should be spinning nice and even.
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Old 04-05-2014, 09:15 AM   #23
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30 psi is excessive for 33" tires carrying a vehicle with the weight of a Wrangler. 26 unloaded 28 loaded is more appropriate.
So the 2 psi lower tire pressure didn't fix the problem? I was sure that would do it!
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Old 04-05-2014, 10:11 PM   #24
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Are you being facetious? Haha
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Old 04-13-2014, 02:42 PM   #25
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Just installed the new axle shafts. I'm very happy with the way the jeep rides now. Turns out I had a seized brake cylinder too. Jeep rides so much smoother and stops better too! Thanks for the help!

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