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Old 12-03-2012, 10:10 AM
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Quadra Trac 2 Clunking Sound

I have a 2012 Grand Cherokee Laredo with quadra trac 2 and from a dead stop when I hit the gas I hear a clunking sound and feel the clunk coming from what seems to be the rear end. I was told at the dealership there is some tension spring in the 4x4 system that is expanding on acceleration and there isn't a fix for the issue yet. (not rear suspension springs)

Has anyone else had this issue and am I being told the truth?

Please help and thanks in advance!
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Old 12-03-2012, 10:37 AM
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Re: Quadra Trac 2 Clunking Sound

Rear bump feel when accelerating

Skip the first response of that linked thread. It's a common issue with 4wd vehicles apparently.
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Old 12-04-2012, 08:56 AM
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Re: Quadra Trac 2 Clunking Sound

Issue may be in the mind of the beholder. .. Normal for this kind of drive system.
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Old 12-04-2012, 09:07 PM
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Re: Quadra Trac 2 Clunking Sound

I have it too. Fortunately it's my wife's vehicle, as I wouldn't put up with it in my own a daily driver. I've had 4x4's since 1985 and never experienced it before this one. Jeep's response is that's it's normal and to live it - Disappointing...
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Old 12-05-2012, 10:43 AM
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Re: Quadra Trac 2 Clunking Sound

That's what I've been told. This is my 3rd Jeep in the last 5 years, but the first one with this issue... oh well I guess.
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Old 12-05-2012, 05:53 PM
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Re: Quadra Trac 2 Clunking Sound

If you ha e the tow package with the self leveling rear suspension it is a very common problem with the suspension setup there are several posts about it some call it the bowling ball in the trunk
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Old 12-05-2012, 06:21 PM
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Re: Quadra Trac 2 Clunking Sound

May be, but mine doesn't do it.
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Old 12-09-2012, 06:57 AM
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Re: Quadra Trac 2 Clunking Sound

Sounds like the "bowling ball in trunk" issue, not to be confused with the rattling of the self leveling shocks which is a different issue. Yeah, it is really annoying and my previous Ford, Toyota and Daihatsu 4WDs certainly didn't make that thump. But then this vehicle has so many other faults that most people don't notice this one...
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Old 12-09-2012, 10:11 AM
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Re: Quadra Trac 2 Clunking Sound

Did any of those vehicles have an active 4WD system?

My Daihatsu made one big thump when the rear end fell out. Now that there was an issue . Shortly after Dads Ford escaped warranty, the doors would lock and lights flash and windows go up and down every time he opened and closed the driver door. Sometime the horn would beep. There was always a flashing idiot light on the dash for no apparent reason. Seems like Ford bean counters wanted to save a penny on each car by cutting cables 1/4 inch short and they eventually broke. Besides having no power, my Toyota just rusted out foot through the floorboard and all. Those are pretty good issues.....
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Old 12-09-2012, 11:22 AM
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Re: Quadra Trac 2 Clunking Sound

Quote:
Originally Posted by amill View Post
Rear bump feel when accelerating

Skip the first response of that linked thread. It's a common issue with 4wd vehicles apparently.
glad i'm not the only one - it feels more like a shaft drive slap sound
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Old 12-09-2012, 02:20 PM
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Re: Quadra Trac 2 Clunking Sound

I wonder if the QTI suffers from the same issue.
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Old 12-10-2012, 08:12 PM
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Re: Quadra Trac 2 Clunking Sound

Quote:
Originally Posted by ColdCase View Post
Did any of those vehicles have an active 4WD system?

My Daihatsu made one big thump when the rear end fell out. Now that there was an issue . Shortly after Dads Ford escaped warranty, the doors would lock and lights flash and windows go up and down every time he opened and closed the driver door. Sometime the horn would beep. There was always a flashing idiot light on the dash for no apparent reason. Seems like Ford bean counters wanted to save a penny on each car by cutting cables 1/4 inch short and they eventually broke. Besides having no power, my Toyota just rusted out foot through the floorboard and all. Those are pretty good issues.....
Ha ha, yeah nothing is perfect, at least not any car...

You might have a point about the driveline being different. Does anybody know of another brand of 4WD that DOES have the same kind of driveline. How about last generation ML?

Regarding the "bowling ball clunk" I will just quote myself from another tread:

"This time I had been granted a service tech for a ride upon arrival with the transmission at full operating temperature ca. 75 deg. C. The bump was easily reproduced many times in a row and the service tech was not surprised. He said that all V6 petrol models (they only come with QT2 in Australia) had this bump. V8 and diesel models doesn't have it. His opinion was that it had something to do with the rear differential. He then switched the Selec-Terrrain to Sand/Mud and the bump disappeared (normal ride height). He said that it bumps only in rear wheel drive mode and it is "normal" for this model."

My service tech called it rear wheel drive mode when in Auto/normal and driving straight out on tarmac (definitely no wheel spin or need for front wheel drive to engage) and I get a big thump. Does the center diff do anything in this situation?

From other posts it seems my tech was wrong about V8 and diesels not having the issue. I believe it is because transmission temp has to be up before you feel it, so it isn't detected on their normal cold test run.

There has been many suggestions in other treads to what makes this thump but so far I still don't know exactly where it comes from. One guy had a new transfer case put in but didn't report back after that. Only thing I am sure of is that it has nothing to do with suspension or brakes, it is in the driveline.
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