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Old 05-21-2018, 02:56 PM
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09 JK Shudders

Hi All,

I have an 09 JK with about 170k on it. about 7 months ago the dealer replaced a shift solenoid. Now i'm having a vibration which feel like i'm on rumbling strips or pulling a trailer and just the trailer is hitting bumps. it happens between 40ish and 55ish mph. I can't replicate it, some times it happens and sometimes it doesn't. It seems to happen more when coasting or letting of the throttle when coming up to speed(so coasting) its happened going will with constant throttle as well.

I thought maybe it was pre death wobbles but can rule that out. I also put new shocks, coils, rotors, and pads on this past weekend and of course its still happening, and tires are balanced, drive train is not loose.

I read some forums about some 07s with similar issues and this was one of the links referred to here.

Since its for 07s I didn't know if it could be something similar. Let me know what your thoughts are.

Thanks

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Old 05-21-2018, 03:52 PM   #2
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check torque on all steering components, what do you mean drive train is not loose?
have you checked to see if your drive shaft is balanced? When is the last time you changed the unit bearings?

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Old 05-21-2018, 04:04 PM   #3
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First thought when someone uses the term "shudder" is the torque converter.
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2011 JKU, 3.8v6, automatic, 2.5 inch lift, 35 inch Nitto Trail Grapplers on 17x9 Eagle Alloy 197 wheels
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Old 05-21-2018, 04:14 PM
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Got down there and tried to shake the drive shaft and it had no play. I'm ruling out any balancing issues cause it doesn't happen all the time. I just took it for a spin after reading some more and I couldn't get the shuddering to happen when I turned off OD. Not too sure about the unit bearings. How often do they need to be replaced?

Thanks
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Old 05-21-2018, 04:22 PM   #5
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i run big tires and 10 inch rims with 3.75 back spacing and am lucky to get 10000 miles otu of them... I was origionally thinking its driveline vibration (hard to guess on a 10 year old vehicle without seeing it)

Wandell might have hit the nail on the head.
Check your ATF fluid, is it red or dark brown/black, it should be red. Should also be more "clear than cloudy" If the TC is going out , its a farmer type way of checking.


other things to try would be to swap tires on it and see if your getting vibrations from tires,
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Old 05-21-2018, 04:34 PM
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Just made an appointment with dealer for tomorrow. Hopefully they wont charge me with diagnostics since they couldn't figure out what was wrong with it last week. I'll check the ATF, I really hope its not the TC and they ream me on the labor.

I'll let you know what they say.
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Old 05-21-2018, 05:41 PM
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Also so they don't ream me even more how long for labor should I expect?
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Old 05-21-2018, 08:46 PM   #8
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My first suggestion would be to change the fluid and filter, not flush, but drain. Mine made a hugh difference after it was done.
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Old 05-22-2018, 01:43 PM
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Dealer just called and its the torque converter. Don't know why they couldn't figure that out last week when thy were telling me it was the steering shock. I see Mopar's site has it for 200 bucks off than what the dealer was saying. Is there a better after market one over Mopar? Is it worth it having the dealer do it for 900 bucks of labor or do you think I could do it or should I find someones cheaper?
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Old 05-23-2018, 10:07 AM   #10
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Depends on your mechanical skills and tools you have.
You either have to pull the engine , or pull the T-case and the transmission, after that the Torque converter comes out easy. replacement = Ive no firsthand experience as the 3 JKs we have in my family are all manuals but would check into aftermarket. If you've got bigger tires and not regeared , would consider regearing as it makes it much easier on the 2007-2011 , since 2012 the factory has a more durable tc it makes it easier on all jks but the 3.8 definately came stock with a weak torque converter compared to the newer 3.6s.

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