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Old 02-15-2012, 09:49 AM   #1
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Unhappy Vibration at idle HELP!

I have recently replaced my transmission mount, on my 06 TJ and I have replaced the engine mounts. the proublems with the learching and engine jumping is cured. But yesterday on my way home I started fealing a vibration at idle, and around 1800 rpm. It comes back around 50mph. I went over everything I replaced, and everything is tight. This virbration shakes the whole jeep, and mirors. I did use a POLY MOUNT. I was told i would feal the engine more.. which I did.... But this isn't right.... Please I have a Long drive on Friday, and its wed... I need to figure this out.


--K&N, 31's, quick disc, Bored and shaved throtle body, Poly bushings, cutsom bumpers.. If it helps..

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Old 02-15-2012, 09:53 AM   #2
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Quote:
Originally Posted by Ziggy06TJ
I have recently replaced my transmission mount, on my 06 TJ and I have replaced the engine mounts. the proublems with the learching and engine jumping is cured. But yesterday on my way home I started fealing a vibration at idle, and around 1800 rpm. It comes back around 50mph. I went over everything I replaced, and everything is tight. This virbration shakes the whole jeep, and mirors. I did use a POLY MOUNT. I was told i would feal the engine more.. which I did.... But this isn't right.... Please I have a Long drive on Friday, and its wed... I need to figure this out.

--K&N, 31's, quick disc, Bored and shaved throtle body, Poly bushings, cutsom bumpers.. If it helps..

--
This is normal unfortunately. When you change the mounts to poly they do not absorb the drivetrain vibrations. They typically just transfer it to the cabin. I would drop in a stock trans mount and trade the other back in.

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Old 02-15-2012, 10:32 AM   #3
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Thanks for the help, I can get one and see if that takes it out, Any ideas why maybe I have gone through 2 of them and ive only had the jeep for about 15,000 miles
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Old 02-16-2012, 09:50 AM   #4
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Quote:
Originally Posted by Ziggy06TJ
Thanks for the help, I can get one and see if that takes it out, Any ideas why maybe I have gone through 2 of them and ive only had the jeep for about 15,000 miles
If you have the inline 6 its because of the torque. If you have bad motor mounts it will cause the trans mount to fail. If you off road a lot it is certain to fail. A lot of people go with a solid mount to get rid of tearing the trans mount. If you're lifted and don't have the proper driveshaft angles then it will add stress to your transfer case which will put stress on the mount too. Hope this helps.
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Old 02-16-2012, 03:59 PM   #5
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I had a poly trans mount in after I replaced my motor with a rebuilt. Shook so hard I thought the motor had a problem. The stock mount going back in cured all. Nice and smooth idle again. Amazing the vibration that was transmitted through that mount!
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