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Old 01-08-2009, 09:36 PM   #1
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99 wrangler high speed front end vibration

1999 Wrangler 4.0L 5 speed with 120k miles. Never off road. No custom stuff -stock. At 50-60mph I get a vibration in the steering wheel after I hit a bump in the road (like a bridge threshold plate). I've had it in for tire balance, rotation, front end alignment, and check for loose front end. Mechanic says all is good. I think not. My other Wrangler (2006) with 40k miles does the same thing. I think it is the drag link.

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Old 01-08-2009, 10:35 PM   #2
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1999 Wrangler 4.0L 5 speed with 120k miles. Never off road. No custom stuff -stock. At 50-60mph I get a vibration in the steering wheel after I hit a bump in the road (like a bridge threshold plate). I've had it in for tire balance, rotation, front end alignment, and check for loose front end. Mechanic says all is good. I think not. My other Wrangler (2006) with 40k miles does the same thing. I think it is the drag link.
Look at your steering stabilizer first. That may well be where the problem is. My 97 TJ did the same thing until I changed the stabilizer.

Good luck!

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Old 01-09-2009, 01:06 AM   #3
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I suggest you crawl under your jeep with someone at the wheel. With the ignition off have your coworker crank the steering wheel back and forth. Watch all your suspension components. Especially the track bar. At 50-60mph I'd imagine your problem is tire balance so your front end components shouldn't have much problems. If everything is in order you won't need a steering stabilizer.
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Old 01-09-2009, 01:43 AM   #4
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I suggest you crawl under your jeep with someone at the wheel. With the ignition off have your coworker crank the steering wheel back and forth. Watch all your suspension components. Especially the track bar. At 50-60mph I'd imagine your problem is tire balance so your front end components shouldn't have much problems. If everything is in order you won't need a steering stabilizer.
X2. A lot of times tires shops will only get them "close" to balanced. Make sure that they do get them true balanced and keep your rotation schedule true also.
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Old 01-09-2009, 08:49 AM   #5
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X2. A lot of times tires shops will only get them "close" to balanced. Make sure that they do get them true balanced and keep your rotation schedule true also.
I had exactly this situation. I put on larger tires and balanced at a national tire dealer and it wobbled when I hit bumps and at 50 mph. After rotating tires again checking everything over to make sure everything was tight and not worn out it was still there. Then while waiting at Walmart(believe it or not) I had them try balancing the tires and I haven't had a wobble since.
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Old 01-09-2009, 09:09 AM   #6
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Most times tire monkeys don't exactly know how to balance a tire properly. When their machine says zero they believe what they see. I refuse to do business with any place that won't allow me to watch the process.

The tire has a heavy side. So does the wheel. The best possible balance comes when you put the heavy side of the tire opposite that of the wheel. Then balance. You can watch the tire spinning on the balance machine. There should be no vertical movement in the tire. If there is you need to break the bead and rotate the tire on the wheel until the vertical movement is gone. Most tire monkeys won't take the extra effort to do that because of all the extra work involved.

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