Vibration at 50+ mph - JeepForum.com
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post #1 of 20 Old 05-18-2013, 07:21 AM Thread Starter
Bayview471
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Vibration at 50+ mph

I just installed a Zone 2" spacer lift and new sway bar links into my '03. I have a very bad vibration at 50+ mph to the point where I can no longer drive at that speed or above. I've checked all bolts and nuts with nothing found loose. I even tightened them all more to be sure. I'm thinking it might be drive shaft no longer being balanced. There are no vibrations under 50 mph. Any ideas? Thanks


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post #2 of 20 Old 05-18-2013, 07:28 AM
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It's your driveshaft, but it's not out of balance. You've pushed it past the amount of "bend" it can reasonably handle.

Two ways to fix it:
- Transfer case drop. Basically you put spacers between your frame and the transfer case skid to help straighten out your driveline. Cheap, but not ideal.
- Slip yoke eliminator and double cardan drive shaft. Basically gives you a drive shaft that can handle more bend. This is the right way to fix it, but parts alone are at least $500.
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post #3 of 20 Old 05-18-2013, 08:40 AM Thread Starter
Bayview471
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How far of a drop would you recommend? I'm on a budget as a college student so $500 isn't happening.

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post #4 of 20 Old 05-18-2013, 08:49 AM Thread Starter
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I also have a welded in skid plate from before I bought it. Does this change my options?

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post #5 of 20 Old 05-18-2013, 09:26 AM
tyvanwie
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Quote:
Originally Posted by Bayview471
I also have a welded in skid plate from before I bought it. Does this change my options?
Is it a high clearance skid?

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post #6 of 20 Old 05-18-2013, 09:44 AM Thread Starter
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No. It's the stock. I was told the nuts inside the frame were torn to shreds while it was being worked on at a shop so they welded it back up.

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post #7 of 20 Old 05-18-2013, 01:04 PM
rchase559
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Quote:
Originally Posted by Bayview471
No. It's the stock. I was told the nuts inside the frame were torn to shreds while it was being worked on at a shop so they welded it back up.
Yes that would pose a problem then. That shop did a hack fix. You would need to cut off the skid and either weld in a steel spacer or actually fix the frame and restore it to its original condition.

Why don't you pull the rear driveshaft and see what happens to your vibes. There's no point in throwing parts at it when you aren't really sure what the problem is. I wouldn't think that a 2" lift would cause all that significant of vibes (I had a 2.5" and a short rear DS with the 42RLE and was free of vibes) but I guess anything is possible.
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post #8 of 20 Old 05-18-2013, 01:49 PM
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Hopefully the shop welded new threaded inserts in the frame, and then bolted the skid plate to the frame.

First thing to do is what rchase559 suggested, remove the rear driveshaft and take it for a drive.
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post #9 of 20 Old 05-19-2013, 09:47 AM Thread Starter
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I'll get on that after work. I did try throwing it in 4wd this morning on my way into work and the vibes went away.

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post #10 of 20 Old 05-22-2013, 11:47 PM Thread Starter
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So I dropped the shaft and no more vibration. I did notice the U joint was loose and was wondering if replacing it might get rid of the vibes. Thanks.

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post #11 of 20 Old 05-23-2013, 02:11 AM
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Quote:
Originally Posted by Bayview471 View Post
So I dropped the shaft and no more vibration. I did notice the U joint was loose and was wondering if replacing it might get rid of the vibes. Thanks.
Certainly won't make them any worse.
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post #12 of 20 Old 05-23-2013, 08:38 AM
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It's the bad drive shaft u joint that is causing vibrations. 2" of lift alone will not cause vibration from a good drive shaft.

97 TJ sport.
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post #13 of 20 Old 05-23-2013, 02:43 PM Thread Starter
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Any recommendations on where to get the replacements or the brand?

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post #14 of 20 Old 05-23-2013, 02:57 PM
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Quote:
Originally Posted by Bayview471
Any recommendations on where to get the replacements or the brand?
Spicer 1310
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post #15 of 20 Old 05-23-2013, 05:15 PM
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http://www.northerndrivetrain.com/ca...ints_1310.html

I like the 5-1310-1X that are greaseable through the end caps....but they are more expensive. The 5-1310-X are lower cost and non-greaseable. You might want to replace your straps while you are at it ($5.55 on the same link shown above).

You also really need the right tool to do this quickly....such as this one that I bought:

http://www.amazon.com/OTC-7248-U-Joi...t+removal+tool

Harbor freight and other tool places have some cheaper alternatives, or maybe you can rent one. This makes the job go faster and is less frustrating than trying to bang it out using sockets. Use a penetrating spray and let it soak overnight first.
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