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Old 12-19-2012, 02:38 AM
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Need help solving drivetrain issue

I've noticed another problem in my lj since I recently got it and I'm not sure what it could be. While stopped and idling either in gear park or neutral there is an inconsistent rumble and vibration coming from somewhere from transmission to the rear end. When I start to drive it seems to go away though. Any ideas on what it could be would be deeply appreciated. Thank you
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Old 12-19-2012, 03:38 AM   #2
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Check the underside for anything that could be loose. If it's got a bolt, nut or hanger I'd check it. Does your Jeep have aftermarket engine mounts? Also check the transfer case bracket and make sure the bushings haven't worn out. A change in rpm from the engine, tires or driveline could cause sympathetic vibrations from loose components, that would come and go as those rpms change

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Old 12-19-2012, 05:13 AM   #3
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Could be something as small as a worn bushing on an exhaust hangar..... exhaust resting on part of the the frame maybe. As stated... a worn mount can do it too. Get under there and look, feel and listen and wiggle components under your LJ and see if you can isolate it.
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Old 12-19-2012, 05:13 AM   #4
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Sounds like the rattle I have, mine is my catalytic converter. The element inside rattles. I've had other friends with this same problem on there Jeeps. Could also be your exhaust hitting your frame or tow hitch. Good luck...took me forever to figure out where mine was coming from.
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