2012 JGC rear wheel slippage - JeepForum.com
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post #1 of 16 Old 02-19-2020, 09:09 PM Thread Starter
Blackshirts
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2012 JGC rear wheel slippage

2012 Jeep Grand Cherokee

rear wheel slip or clunk or shift type feeling. Most definitely happening in the rear. Not a tranny issue from what I can tell.

Almost like a worn U-Joint but I believe it doesn't have a U-Joint.

Anyone have any ideas??

It only happens when I hit the gas off a complete stop. I think its pretty slight but because I'm aware of it, it is all I think about when I'm at a red light.

Thanks

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post #2 of 16 Old 02-19-2020, 09:29 PM
ColdCase
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Do you have Quadra Drive?

There have been quit a few reports of rear suspension cradle bushing wear/failure. A couple long thread here maybe a month or two ago. If no one jumps in here by the time I get back I'll try to find them.

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post #3 of 16 Old 02-20-2020, 05:14 PM Thread Starter
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Laredo X 4x4 with Quadra Trac 1
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post #4 of 16 Old 02-22-2020, 03:29 PM
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At a minimum change the transfer case oil if it has not been lately. Worked wonders for my initial slip when taking off
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post #5 of 16 Old 02-22-2020, 06:34 PM Thread Starter
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ok, will do!

Can anyone tell me what differential oil to use and should I use the limited slip additive?

I will do the transfer case too. What oil do I use?

2012 JCG Laredo x 4x4 quadra trac 1. 3.6 Pentastar

Thanks again!!
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post #6 of 16 Old 02-22-2020, 08:07 PM
ColdCase
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If you have an owners manual, it should list the recommended fluids. QTI is a open AWD transfer case without clutches or cones, so friction modifiers are not required. Same with both diffs. The diffs are probably Mopar Gear and Axle Lubricant 75W-85, the transfer case uses auto trans fluid, approved to MB 236.10, MB 236.12, such as Shell ATF 3403/M-115, Fuchs/Shell ATF 3353, or equivalent or Mopar 05127382AA (1 quart)

My guess is that the thump is more to do with worn suspension (shocks) or bushings or motor/transmission mounts than something in the diffs or transfer case.

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Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
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post #7 of 16 Old 02-24-2020, 12:30 PM
arnoldarres
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Did you make the car diagnosis?
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post #8 of 16 Old 03-06-2020, 07:53 AM
Patrickg13WK2
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My 2013 GC Limited does something similar that feels like a slip in traction from one tire in the rear. I bought it used three years ago and it has done this since then. I figured it was the differential adjusting to differing needs for traction or either side of the rear tires. The condition was severe when I had low tire pressure on one side of the rear. It probably is time for a fluid change in the differential, so I’ll see if that changes the condition. Before I do that though I will confirm I have equal tire pressure on the rear tires to see how that does.
The previous discussion threads might be enlightening… I could not find any.
Thanks everyone!
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post #9 of 16 Old 03-06-2020, 01:21 PM Thread Starter
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We had it up on a lift and could not find anything loose. Its still a mystery
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post #10 of 16 Old 03-10-2020, 04:02 PM
arnoldarres
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Excuse me, can the tire problem?
If the tires are new, try how the car behaves on different surfaces of the road - sand, concrete, etc.
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post #11 of 16 Old 03-11-2020, 08:48 PM Thread Starter
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My new focus is on the brakes, callipers, etc.. but I am still figuring it out.

When I don't really press the brake pedal all the way, then accelerate hard, medium, slow there is not clunk.

It always comes when I have really pressed the break fully.

Thinking maybe something isn't releasing smoothly thus causing the clunk.
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post #12 of 16 Old 03-11-2020, 09:26 PM
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Or when you brake hard, the suspension shifts a little through a worn bushing, and then releases back with a clunk when accelerating. Moderate braking doesn’t exert enough force to deflect/slip the bushing.

I’d look carefully at the suspension cradle to body bushings for wear or corrosion. And make sure the lug nuts are tight.

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post #13 of 16 Old 03-12-2020, 10:28 AM
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Quote:
Originally Posted by Blackshirts View Post
My new focus is on the brakes, callipers, etc.. but I am still figuring it out.

When I don't really press the brake pedal all the way, then accelerate hard, medium, slow there is not clunk.

It always comes when I have really pressed the break fully.

Thinking maybe something isn't releasing smoothly thus causing the clunk.
Hello Blackshirts,
We are certainly sorry to hear about your recent clunk concern. To clarify, have you considered addressing this with your certified dealer? If you decide to go this route, please know we are available to provide any additional assistance throughout that process.
Laura
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post #14 of 16 Old 03-12-2020, 02:50 PM Thread Starter
Blackshirts
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Quote:
Originally Posted by ColdCase View Post
Or when you brake hard, the suspension shifts a little through a worn bushing, and then releases back with a clunk when accelerating. Moderate braking doesnít exert enough force to deflect/slip the bushing.

Iíd look carefully at the suspension cradle to body bushings for wear or corrosion. And make sure the lug nuts are tight.
Can you post a diagram of the inspection points you are referring to? Thanks
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post #15 of 16 Old 03-12-2020, 05:31 PM
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I think someone posted the TSB awhile ago, when I get back I'll try to find it.

Never Argue With An idiot. They'll Lower You To Their Level And Then Beat You With Experience!
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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