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  #49  
Old 08-29-2012, 09:45 AM
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Re: Rear bump feel when accelerating

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Originally Posted by Suther View Post
If you are talking of the constant clunking/rattling while driving you might look at this thread http://jeepgarage.org/showthread.php?t=37484&page=7
If you are talking about the thumb when accelerating you are indeed right here.

Anyway, don't regret the purchase. Sure the car has same issues but it is one of the best looking and driving SUVs in that price class. You can have the same issues on other brands as well, but paid more the 60k. Stay confident and help your dealer to help you. Even when dealer ignore forums like this, they help you to understand things better.
I am sure they will find a fix and so long, stay patient and think positive. It is a great car and you made a magnificent choice in buying it!
My issue is not constant.. only when accelerating and only a single clunk or thud. The bowling ball in the trunk analogy was the best I have heard. Will update everyone by end of week.
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  #50  
Old 08-29-2012, 10:56 AM
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Re: Rear bump feel when accelerating

i also have noticed that it only occurs once i sit for more then a few seconds. If it's a quick stop and take off, it does not happen which tells me it's software or something that is slow to respond after resetting.
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Old 09-14-2012, 01:24 PM
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Re: Rear bump feel when accelerating

All
My 2011 Overland is doing the same thing you all are discussing and has been since it was new and it is getting more frequent as the car ages. THumps when I accelerate from a dead stop. By the way, I notieced that it does not thump when I engage teh 4 WD low setting....not sure why.

Anyway....Jeep Service and the Factory Engineers have been all over my car for two weeks and they agree this is NOT NORMAL. They have instrumented my frame with vibrometers and microphones and can not locate the source.

At their cost of $1800 they replaced my rear differential and for $300 more they installed new rear shocks. Nothing is working to cur ethe situation. I have taken the car back and await their next move...but I will persist! A $45K SUV should not do this...nor any for that matter

TO all those that wish to invoke the Lemon Law...stnad down. Lemon Law only applies to repairs that affect vehicle safety. All else is warranty. What may be the next move from all of us is a CLASS ACTION SUIT.

More to come....standby and I will advise of what becomes of my issue

BlackJack
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  #52  
Old 09-14-2012, 01:31 PM
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Re: Rear bump feel when accelerating

I can't believe they haven't figured out the culprit being that it's pretty much an issue across the board for most wk2s.
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  #53  
Old 09-14-2012, 01:39 PM
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Re: Rear bump feel when accelerating

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Originally Posted by BlackJack View Post
TO all those that wish to invoke the Lemon Law...stnad down. Lemon Law only applies to repairs that affect vehicle safety. All else is warranty. What may be the next move from all of us is a CLASS ACTION SUIT.
This is not entirely true; it depends on your state. For example, in NC there are a couple criteria to meet the requirements and safety is not one of them. Quoting from the NC DOJ (Attorney General) web site...

"The problem occurs in some part of the vehicle that is covered by the manufacturer's warranty and you are within the warranty period. It does not need to be something that keeps you from being able to drive the car. For example, faulty air conditioning or peeling paint could be considered defects under the Lemon Law."
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  #54  
Old 09-14-2012, 02:50 PM
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Re: Rear bump feel when accelerating

I tried to reproduce it and that was kind a difficult. It appears to be more present on left turns than on straight or right ones. Also there has to be some time of a dead stop.

It also only appears in AUTO and SPORT. I wasn't able to reproduce it in SAND or SNOW.

I assume it has something to do with the torque/power transfer to the rear wheels within the transfer case. I have a play/backlash in my rear diff power train though, which is 'normal'.
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  #55  
Old 09-14-2012, 09:53 PM
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Re: Rear bump feel when accelerating

Here is an update on mine. I took it to another dealer here in Chicago area and make sure I spoke to the service manager before just dropping it off.

They ended up putting a new transfer case in it. They said another customer had a similar issue and they did this on a hunch. That customer has not been back. It only been about 50 miles but I have not had the problem resurface since the new transfer case was put it. I am not going to declare victory just yet because my vehicle didn't do this when it was brand new and I want to put a couple more thousand on it.

I think the bowling ball in the trunk analogy describes this issue perfectly. And I agree with other poster than it seemed to happen more on left turns from a dead stop.
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Old 10-16-2012, 07:04 AM
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Re: Rear bump feel when accelerating

No solution yet?
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  #57  
Old 10-17-2012, 10:48 AM
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Strange thing, on mine I barely notice it anymore after 8400 miles. It's either I'm living with the problem or it's gone.
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  #58  
Old 10-21-2012, 06:03 AM
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Re: Rear bump feel when accelerating

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Originally Posted by ov10mech View Post
They ended up putting a new transfer case in it.

I think the bowling ball in the trunk analogy describes this issue perfectly. And I agree with other poster than it seemed to happen more on left turns from a dead stop.
Any update?

I don't actually think it is a common issue as not that many people complain about it. Agree to the bowling ball analogy, that's exactly how it feels. Left turns - no! I live in Australia where we drive on the left side of the road and I will say right turns are worse. It's about the amount of gas you give. You only get the bump when the transmission is up to full temperature AND you give full (or near) gas. You don't do that on narrow turns. Try full trans temp, straight out, doesn't matter if the JGC is at full stop or not, nothing to do with brakes, from stop or slow rolling, give full gas you get the bump. Well, at least that's how it is in my 2011 3.6 QT2.

My dealer claimed to have made a software update to "alliviate" the problem. Didn't make any difference. I just live with it now. No problem for short runs as the transmission temp takes a long time to get up but really annoying otherwise.
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Old 10-23-2012, 10:55 PM
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Re: Rear bump feel when accelerating

Quote:
Originally Posted by BlackJack View Post
All
My 2011 Overland is doing the same thing you all are discussing and has been since it was new and it is getting more frequent as the car ages. THumps when I accelerate from a dead stop. By the way, I notieced that it does not thump when I engage teh 4 WD low setting....not sure why.

Anyway....Jeep Service and the Factory Engineers have been all over my car for two weeks and they agree this is NOT NORMAL. They have instrumented my frame with vibrometers and microphones and can not locate the source.

At their cost of $1800 they replaced my rear differential and for $300 more they installed new rear shocks. Nothing is working to cur ethe situation. I have taken the car back and await their next move...but I will persist! A $45K SUV should not do this...nor any for that matter

TO all those that wish to invoke the Lemon Law...stnad down. Lemon Law only applies to repairs that affect vehicle safety. All else is warranty. What may be the next move from all of us is a CLASS ACTION SUIT.

More to come....standby and I will advise of what becomes of my issue

BlackJack


Any updates on this? I have to believe that Jeep has looked into this and has either figured out why and/or has a fix for it. It's really starting to get to me.


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  #60  
Old 12-06-2012, 12:09 PM
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Re: Rear bump feel when accelerating

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Originally Posted by ajs800 View Post
another thing i did is...I tested about 10 quick take offs and noticed the bump a few times out of the 10. I then did 10 take offs but before doing so, I placed it in "N" and then back in gear and not once did the bump feel occur.

Also, My vin# does not fall into any of the suspension TSBs as mine is a last week (mid June '11) build for 2011.

another thing...I can feel the bump only...no sound is made.

Let us know if your issues are resolved or not.


.
I have the same thing in stop - go situations. Not every time but realized it depends on how hard i hit the brakes or how fast i step on the accelarator. That being said, when i push the brake pedal very gently to stop i do not have any bump from the back. On the contraty if i slightly but instantly hit the brakes i feel the bump. Same with acceleration, slow acceleration (from stop) no bump, fast acceleration (i.e punching the pedal to the bottom) it bumps. Once i did that with the window open in a very narrow road and heard a heavy metal noice coming from the bottom of the car together with the 'bump'. Check if you have the same symptoms. I have a fairly new Startech springs so i think it's not supsension related problem. Interested to know if this could potentially cause future problems. I have a 2008 GC Overland 3.0L diesel.
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