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Old 11-30-2013, 10:32 PM   #1
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Clunk from front driveline 2014 JKUR

Went to Moab this weekend, had a blast with everything from steep steps to deep mud (yes mud, Moab is very wet right now).

Completely stock 2014 JKUR, 6-speed, 2000 miles on it. In 4WD high or low, but much more noticeable in low, there is a loud clunk from what I guess is either the t-case, driveshaft/u-joints, front diff or axles, every time you transition from throttle off to throttle on. For example, you are climbing a steep set of steps in low range, and when you get to the top of the hill you let off the throttle. Clunk! Throttle on - Clunk! Throttle off - Clunk! It is very noticeable from outside the vehicle.

It is definitely from the front - no noises in 2WD.

It is going to the dealer as soon as I can get there, but in the meantime, has anyone had this issue?

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Old 12-01-2013, 02:49 AM   #2
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Metallic or a thud like hitting a box. Explain the noise better.

The driveline can be noisy on jeeps, especially the 6 speed.

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Old 12-01-2013, 05:55 AM   #3
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I noticed the same with mine as well. Sounds like the normal back lash between the ring and pinion to me. (In my jeep) So I try not to "hammer it" on and off the accelerator. It went away. I have read that the sensitivity levels of the reaction of the pedal is somewhat adjustable through software changes. I am not sure because I have not done it. Just read it someware.
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Old 12-01-2013, 10:24 AM   #4
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No sounds from mine, 1500 miles, but I have an auto. Just did Superlift ORV in Arkansas on Thanksgiving and it ran flawlessly.
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Old 12-01-2013, 03:12 PM   #5
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Same clunking here (2013 JKUR 6 speed). I also have it in 2WD when shifting 1 to 2 and 2 to 3 unless I rev beyond 3500 rpm before shifting. My best guess its due to a combination of the excessive lag in the electronic throttle, the low gearing of the JKUR, lots of slack in the drive line (careless manufacturing/assembly) and an overly heavy flywheel.
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Old 12-01-2013, 03:55 PM   #6
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Is this just normal backlash you guys are hearing ?
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Old 12-01-2013, 03:57 PM   #7
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Quote:
Originally Posted by kjeeper10 View Post
Is this just normal backlash you guys are hearing ?
I don't think you'd hear backlash that badly (as described), but possible. How loud are we talking? Did you hear this noise before Moab?
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Old 12-01-2013, 04:35 PM   #8
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Try this, go lay under your Jeep with it parked and move the front driveshaft back and forth as hard as you can by hand. Is this similar to what you're hearing? It's totally normal.
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Old 12-01-2013, 08:50 PM   #9
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It sounds just like a bad u-joint, but I can't get the front driveshaft to move even a millimeter by hand.

I was spotting and I could hear it over 50 feet away. It could be any of a dozen things, but that's why I have a warranty - the dealer can spend their time figuring it out. I can't get it to the dealer for at least a week; I'll post when they give me an answer.
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Old 12-01-2013, 09:46 PM   #10
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Quote:
Originally Posted by co-utah View Post
It sounds just like a bad u-joint, but I can't get the front driveshaft to move even a millimeter by hand. I was spotting and I could hear it over 50 feet away. It could be any of a dozen things, but that's why I have a warranty - the dealer can spend their time figuring it out. I can't get it to the dealer for at least a week; I'll post when they give me an answer.
Was it in 4wd? It should move.
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Old 12-02-2013, 06:56 AM   #11
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Quote:
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Was it in 4wd? It should move.
Its still locked to the axle in 2wd.
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Old 12-02-2013, 07:06 AM   #12
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Its still locked to the axle in 2wd.

Yes iam aware. But to say there's absolutely no movement at all, he is either incorrect or there's a problem. In park you should be able to rotate the DS a small amount because of backlash in the gears.
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Old 12-02-2013, 08:29 AM   #13
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Yes iam aware. But to say there's absolutely no movement at all, he is either incorrect or there's a problem. In park you should be able to rotate the DS a small amount because of backlash in the gears.
Yes it should move. I can move my front DS by hand just a little and I hear quite a bit of driveline slack when offroad in 4low especially when on off the clutch. Make a video of it perhaps?
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Old 12-02-2013, 10:14 AM   #14
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Yes iam aware. But to say there's absolutely no movement at all, he is either incorrect or there's a problem. In park you should be able to rotate the DS a small amount because of backlash in the gears.
This is a 6-speed, not an auto. I believe the "backlash in the gears" you speak of is actually your transmission.

Trust me, I jacked hard on the front driveshaft and it didn't budge.
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Old 12-02-2013, 10:59 AM   #15
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This is a 6-speed, not an auto. I believe the "backlash in the gears" you speak of is actually your transmission. Trust me, I jacked hard on the front driveshaft and it didn't budge.
Sir .. I drive a 6 speed. Same tranny 07-present. There should be slight movement in your DS. I don't know one 6 speed DS that does not. Look at the posts above.
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Old 12-02-2013, 11:16 AM   #16
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6 speed tranny here. while offroading there are a lot of noises that make someone who isn't an experienced jeeper cringe (me). very experienced passenger tells me its all normal.

but yours is interesting. the only thing mine does is want to bounce due to the low gear when coming on and off the throttle and there is a slight clank. again, was told its normal.
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Old 12-02-2013, 11:18 AM   #17
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I noticed the same with mine as well. Sounds like the normal back lash between the ring and pinion to me. (In my jeep) So I try not to "hammer it" on and off the accelerator. It went away. I have read that the sensitivity levels of the reaction of the pedal is somewhat adjustable through software changes. I am not sure because I have not done it. Just read it someware.
That's where most of my noise came from. I was used to a 30 year-old (but still smooth as silk) Honda 5-speed with a mechanical clutch and throttle. Then I get my JK with it's 6-speed and electronic throttle with it's delay and I had to re-learn to drive a manual.. Totally different animal.

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