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  #61  
Old 12-07-2012, 05:02 AM
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Re: Rear bump feel when accelerating

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Originally Posted by Suther View Post
Confirm, having both and they are different.

A 'bump' thump once in a while when starting from stop (thought first it is the Hill Assist, bit switched that of and is still there) and the other is a 'box of marbles' in my trunk. According to the posts here and Jeep the marbles should only exist with the self-leveling shocks. On the normal suspension there are some TSBs for the 11s.
Don't know anything about QL but some posts indicate the marbles also.

Comming back to the start thump, I agree it feels like the driveshaft is annoying to me but currently on a low priority. Maybe its a tolerance issue in manufactering it or Some wear. Let's see if it gets worse with mileage.

I have 4k miles and start recognize it.
Once i pushed the accelarator to cross the road fast to turn left and after 20 meters i hit the brakes as i had to stop. I did fell this 'bump' thump, but since i was moving on a very quiet road and i had my driver's windiow open i ALSO heard a very loud and heavy metal noise (like hitting a hammer on solid steel) coming from the underparts of the car. I thought it was from the shaft between the two differentials. Maybe this is how it works to absorb all the forces from fats start - stops ????
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  #62  
Old 12-16-2012, 10:45 PM
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Re: Rear bump feel when accelerating

I feel the clunk as well on my 2013 WK2 with QT-I system and 1100km on it. Seems to only be when accelerating from a complete stop. To me it felt like what happens when you take up the slack too quickly when towing something, a clunk or a jerk. The bowling ball analogy makes sense too.

To the guy that had the transfer case replaced, did that fix it?
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  #63  
Old 12-18-2012, 12:07 PM
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Re: Rear bump feel when accelerating

I have a similar (if not the same issue) When I accelerate and turn left it almost feels like my tire hits a slick spot then catches
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  #64  
Old 12-18-2012, 06:18 PM
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Re: Rear bump feel when accelerating

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Originally Posted by BuckeyeSRT View Post
I have a similar (if not the same issue) When I accelerate and turn left it almost feels like my tire hits a slick spot then catches

Although this is different from the problem in discussion, i know exactly what you mean. Yours is happening in wet conditions when accelerating from complete stop with the steering wheel turned to the left all the way. I have noticed the same in my GC a few days ago in wet conditions but its not the first time i come across this..........my previous car an AUDI 1.8T QUATTRO was doing the exact same thing. So my only guess is that it's normal 4wd thing.............
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  #65  
Old 12-18-2012, 10:18 PM
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Re: Rear bump feel when accelerating

Add me to the list bump list as well. The first time it happend I thought my seat had come loose. Now that its happend a few times I suspect the u-joints or drive shaft. Its not a hard bump but its enough to worry about whether it will wear out before 150k (my target mileage).
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  #66  
Old 12-19-2012, 07:35 AM
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Thesis; the super sophisticated Auto 4WD detects a wheel slip of a minimal degree (very sensitive to predict driver habits as an advertiseable capability) and immediately transfers torque to the other wheels by ... triggering clutches in the T-case and applying brakes on the wheels. These actions or their release as soon as the bright electronic brain recognizes "oh, that guy isn't driving as I thought" could cause that bump.
Sarcasm off;-)
Anyway, that might be truly a programming issue of an overreacting Auto4WD System or the driveshaft joints or the diff or the T-case... Lot of possibilities and they might be different for each of us.
I personally stick with the Auto4WD programming for the V6 config (driveline despite diff & auto is the same as V8s and they don't have that issue apparently) as reason and hope for a programming fix for the V6.
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  #67  
Old 02-02-2013, 07:11 AM
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Re: Rear bump feel when accelerating

So that is it, over a year and no solution to this issue, but to live with it. it seems any appliance manufacturer backs up their product better
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Old 02-02-2013, 09:14 AM
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Re: Rear bump feel when accelerating

Its not an issue, its just the way the traction control works. If you want 100% smoothness and pampered ride, buy a car not a truck.
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  #69  
Old 02-02-2013, 11:18 AM
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Re: Rear bump feel when accelerating

I encourage anyone who is fed up with this issue to take legal action. I cannot discuss details but will say it was very effective for me. Check out the the Magnuson–Moss Warranty Act regardless of what state you live in.

I have seen horrible advice in this forum that people should just deal with it because its a truck, as it's somehow your fault .

I no longer own this clunky piece of crap and bought a brand new Ford Pickup TRUCK It engages smoothly and doesn't slip or clunk. I have had other SUVs and trucks and the Jeep Overland was the worst as far as overall maintenance issues.

Replacing the transfer case is only a temp fix. It works for a while and the issue will come back.
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  #70  
Old 02-02-2013, 06:34 PM
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Re: Rear bump feel when accelerating

Thanks ov10mech for finally giving us an update.

I am still living with the problem but will have a different dealer look at it next week, together with other current problems (some seem to be Australia specific): Burned daylight running lights and rear brake lights, "Stuck in sand" reprogramming of ABS module, and a reoccurring thud in the steering wheel when braking lightly plus a number of issues I have learnt to live with like the rattles and scraping sounds, side mirrors that fold out when they shouldn't, air suspension that raise when it shouldn't and other minor things.

For others who are still trying to do something about the rear bump I noticed this post in the export section thread "Grand Cherokee + sand = FAIL":

Quote:
Originally Posted by Baxter View Post
I also had my "Stuck in Sand" fix done at Albion on Monday (2011 CRD steel Springs). The one thing I have noticed is that the "bump" I was feeling when taking off (once the gear box was up to temp) is now gone. (for good I hope)
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  #71  
Old 02-02-2013, 11:45 PM
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Re: Rear bump feel when accelerating

Buckeye, you described it the way I do...like a slip then it catches. More pilling away from a stop not to hard, but not easy either. 2013 hemi, tow pkg with self leveling, 20's, NO QL. Started about 3k miles, now have about 5500 miles, and its irritating me...cuz it's the wife's car and I gotta hear about it. our 4 other grands didn't do it, 2 have over 200k miles, neither did my moms 2 Durangos, that all have either full time awd, QT II, or QD.
It seems like some axle wrap, or slack in the drivetrain that gets caught up and thumps, but damn, my 2012 dually cummins with 800 lb ft doesn't do this unless I'm on it hard let off then back on it, and then not always. I think it's BS, I'm not going crazy and saying this is the worst piece of junk ever like some, I have a buddy, his new land rover threw a bearing at 1k miles, messed up the whole break assembley, he had FACTORY 20's that came on it and they wouldn't warranty it cuz he had 20's, and said they're too big of rims and caused it to fail...he off loaded it that day
Now I see I'm not the only one, I'll go for a ride at the dealer, see what they say, if I have to, I'll get my company's fleet rep involved(vice president of dodge/ram fleet) and try to come to a solution.
If necessary, I'll go so far as to push for a new one, trade me out without killing me on it, take mine back, get me a new CRD when they come in and I will start a new lease...not the end of the world here, yes BS, but there are worse things in life.
It would be nice to be able to grease this stuff too like the older ones, even our '10 wrangler had nothing to grease, just bothers me.
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Old 02-02-2013, 11:46 PM
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Re: Rear bump feel when accelerating

Sorry for the grammar and spelling, damn iPad and my big sausage fingers
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