Weird Vibration wont go away -
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post #1 of 5 Old 06-20-2011, 09:04 AM Thread Starter
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1999 TJ Wrangler 
Join Date: Jun 2011
Location: Douglasville
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Weird Vibration wont go away

This is my first post so excuse me if I posted this in the Wrong area. I also dont know too much about the specs of my Jeep yet but will add as i learn more.

I just purchased a 1999 Wrangler Sport 4.0 with a 4 inch lift kit already installed on it. When I first got the Jeep I noticed a vibration in the steering wheel and dashboard that starts right about when I hit 30 miles an hour and continues more vigorously through about 50 miles an hour and then fades away completely above 50 miles an hour.

I have replaced all 4 tires with brand new ones, replaced all the shocks and even replaced the rear axles in hopes that would alleviate the issue. It has lessened the severity of the vibration overall but it is still very noticeable. My mechanic seems to think it may have something to do with the "Pitman Arm" or "Pitman Bar" or possibly the driveshaft.

The vibration only happens when I push the accelerator which leads me to believe its more than what my mechanic thinks but what do I know.

Anyone out there have any ideas or have had a similar issue?

Last edited by clutchn350z; 06-20-2011 at 09:50 AM. Reason: More details
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post #2 of 5 Old 06-20-2011, 09:46 AM
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2003 TJ Wrangler 
Join Date: Aug 2006
Location: CharlottesHELL
Posts: 35,899
Sounds like a driveline vibe from the 4" lift.You SHOULD NOT have a drop pitman arm either,unless you have a frame side track bar drop also.How much t case drop does the lift have? A MML would fix it if that's the problem(driveline vibes).
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post #3 of 5 Old 06-20-2011, 11:24 AM Thread Starter
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Join Date: Jun 2011
Location: Douglasville
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Thanks Boogieman! I am not too familiar with Jeep lingo yet as this is my first Jeep and I have had it for 3 weeks. Can you let me know what an MML is?
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post #4 of 5 Old 06-20-2011, 11:36 AM
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2000 TJ Wrangler 
Join Date: Apr 2005
Location: Elkmont
Posts: 10,048

MML = Motor Mount Lift. There are two types of MML. One is taller motor mounts that completely replaces the stock mounts. The other is a budget MML which is a spacer that goes under the stock mount. The MML raises the front of the engine/transmission/transfer case assembly which reduced the angle at the drive shaft. This is a common fix for drive shaft vibration caused by suspension lifts. Another common fix is a transfer case drop which is spacers put between the frame and the skid.

At four inches of lift you have entered the range where the best fixe is a SYE, slip yoke eliminator. The SYE puts a shorter, stronger rear output shaft on the transfer case and uses a CV drive shaft.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #5 of 5 Old 06-20-2011, 03:58 PM Thread Starter
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you guys are awesome thank you very much
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help needed , vibration on acceleration

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