Vibration in the front of my Jeep. - JeepForum.com
 
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post #1 of 11 Old 03-28-2012, 06:38 PM Thread Starter
TeeJayPee
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Vibration in the front of my Jeep.

I have a Jeep Wrangler SE with 170k miles, it has the DANA 30 front end w/ 4.10 gears. My concern is... I have a vibration when I get to between 50-60mph that seem to start somewhere under my legs.
While accelerating it becomes more noticeable and waves/pulses from there to the front left then to the front right from 50-55mph; getting faster with increasing speed. Then around 60mph it is everywhere and shaking everything; feels like bad mud'n tires are on the front of my Jeep. (minus the loss of control) It's not a bad vibration and it's not a death wobble (felt that before too, not cool!!) But I don't want to get on the freeway anymore, because I don't like to push it much higher than 60mph. It might even be there all the time I just don't FEEL it until those speeds... (FYI, the 4x4 is not engaged.)
I've replaced the hubs and that wasn't the problem! Before I run the replacement part gauntlet, what else could this be? Play in the spider gear(s), or the u joints on the front axles/drive shaft? All the U Joints seem to be strong with no slack in any of them...? There is however some type of extension joint on the front drive shaft that has a boot around it... It seems to have a lot of play when I grab and shake it, and the pinion seal is leaking fluid too; that's probably not a coincidence, Right? Does this joint need grease??? It doesn't feel like there is any in it, but there's not a grease fitting either, and it looks like the metal clamps holding the boot on will have to be cut off to get into it? Could this be the culprit?

Can someone help shed any light? Also, sorry about the long drawn out explanation.

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post #2 of 11 Old 03-28-2012, 06:47 PM
joechrom
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I have a bit of vib when I hit 60. Seems to go away around 65-70. I will start with s tire balance and n alignment. Other than that I'm clue less. My LJ is stock
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post #3 of 11 Old 03-28-2012, 08:05 PM Thread Starter
TeeJayPee
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Thanks for your input Joe, but I already eliminated tires as a possible issue. There were "mudders" on the Jeep when I bought it. Thinking that was the issue, I had them replaced with passenger tires. Much to my surprise, the noise nor the vibration went away...
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post #4 of 11 Old 03-28-2012, 08:52 PM
97lon
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Pull your front drive shaft, it's real easy, use a 5/16 wrench. You either have a centering ball going bad( it's in drive shaft) or u-joints too. Drive without front shaft and it should go away. There are plenty of links on drive shaft repair on here . Good luck
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post #5 of 11 Old 03-28-2012, 11:12 PM
MPmedic
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Had the same thing happen on two of my XJ's and a TJ, Have you checked the bushings on your track bar, might be time for a steering dampner too. Cheap fix, did it for me. Good luck!

Last edited by MPmedic; 03-28-2012 at 11:16 PM. Reason: Missed one of the symptoms...
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post #6 of 11 Old 04-13-2012, 10:30 PM Thread Starter
TeeJayPee
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Thanks for all the input, it's great! Come to find out, I thought all the u-joints were good then I felt it... The front joint, on the rear of the drive shaft had a 1/4" of play. Oh boy, got a new project coming soon...

I have one more "wonder" about this front end. The slip yoke, has hella play. Any input there? Maybe a "how to" on the method to fix it; other than buying new. (I refuse to pay 4-6 hundred for a new drive shaft)

Thanks again ya'll, this place is great!
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post #7 of 11 Old 04-16-2012, 11:51 AM Thread Starter
TeeJayPee
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Never mind, drive shaft is shot. It's going to be a minimum of 250 bucks to fix it. I'm going to be saving money for a while. (BTW, with the drive shaft off, it drives like a dream) Thanks everyone for all the input!!
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post #8 of 11 Old 04-16-2012, 11:59 AM
RaggedOleMan
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Regarding your pinion seal replacement, I did it a while back. Here's a link to the write-up.
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post #9 of 11 Old 04-16-2012, 12:13 PM
SlackJaw
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Quote:
Originally Posted by TeeJayPee View Post
Never mind, drive shaft is shot. It's going to be a minimum of 250 bucks to fix it. I'm going to be saving money for a while. (BTW, with the drive shaft off, it drives like a dream) Thanks everyone for all the input!!
I think if you buy the parts and have the shaft off already anyway, you might find someone to press them in for like $50.
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post #10 of 11 Old 04-16-2012, 12:46 PM
rchase559
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Quote:
Originally Posted by SlackJaw View Post
I think if you buy the parts and have the shaft off already anyway, you might find someone to press them in for like $50.
It's not the joints or centering ball that was bad in this case. The OP stated that the slip portion of the shaft had play and the only way to fix this is to cut off the slip section of the shaft and weld new pieces in.
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post #11 of 11 Old 04-16-2012, 01:02 PM
SlackJaw
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Quote:
Originally Posted by rchase559 View Post
It's not the joints or centering ball that was bad in this case. The OP stated that the slip portion of the shaft had play and the only way to fix this is to cut off the slip section of the shaft and weld new pieces in.
okay, sorry, I misunderstood the "front joint on the rear of the drive shaft" to mean one of the cardans...I guess I also misunderstood the specificity of "nevermind, the drive shaft is shot".
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