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  #133  
Old 02-24-2014, 11:42 AM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by bobh View Post
I received my new vehicle after 8-9 weeks and I replaced the Goodyear Fortera with the Firestone Destination ST and there is considerable improvement in handling and turn in , much more responsive

How do they ride compared to the Goodyear? Are they quieter, better ride quality?
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  #134  
Old 02-24-2014, 11:51 AM
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Re: Vibration in the 2014 grand cherokee summit

The firestone handle much better than the Goodyear Fortera. The steering response and turn in is much improved.
The Goodyear has a much more flexible sidewall .
I am thinking of putting the SRT 20X10 wheels with the 295 tires on .
I may even change the springs to either the SRT stock or Eibach pro kit.
This should also improve handling .
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  #135  
Old 02-24-2014, 11:54 AM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by bobh View Post
The firestone handle much better than the Goodyear Fortera. The steering response and turn in is much improved.
The Goodyear has a much more flexible sidewall .
I am thinking of putting the SRT 20X10 wheels with the 295 tires on .
I may even change the springs to either the SRT stock or Eibach pro kit.
This should also improve handling .

thanks

I am looking for a tire that is quieter, and one that is a smoother ride quality. Do the ST's fit the bill? or are they just better for handling only and not noise and ride quality?
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  #136  
Old 02-24-2014, 12:04 PM
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Re: Vibration in the 2014 grand cherokee summit

The firestone is a firmer ride than the Goodyear . Noise is about the same.
I you want better ride quality stay at the lower speed ratings for the tires .
I didn't think the Goodyear had a bad ride.
I keep my tires on the firm side with the air pressure .
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  #137  
Old 02-24-2014, 03:41 PM
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Re: Vibration in the 2014 grand cherokee summit

I've put about 600 miles on my 2014. It has been at the dealership all weekend. They could not get any of the 4 18" Michelin tires within spec and are awaiting approval from Michelin to replace all 4 tires. But, here is where it gets worse. I was under the vehicle, looking at how to pull my front lower bumper off to add OEM tow hooks, and I noticed the bolt attaching the driver side control arm to the frame has backed itself out, likely because of the vibration caused by the tires. Dealership said no further damage was found, and they simply put the bolt back in place and tightened it. I have photos, but can't figure out how to post them. I'm new to this site, and Jeep ownership!

https://drive.google.com/file/d/0B46...it?usp=sharing
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  #138  
Old 02-24-2014, 04:03 PM
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Re: Vibration in the 2014 grand cherokee summit

Is the vibration at approximately 60 mph ? Is it the road force balance they cannot get with specs?
The car is built in Detroit , I think that tells us something right there .
There have been so many owners that have the same problem , I don't know how they are handling this
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  #139  
Old 02-24-2014, 04:05 PM
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Re: Vibration in the 2014 grand cherokee summit

Actually, I'm seeing the vibration at closer to 70 mph. They couldn't get the tires within spec force balancing on the Hunter machine. Mine is a June 2013 build, that may have just sat somewhere and now has flat spots, at least that's what they're telling me.
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  #140  
Old 02-24-2014, 04:08 PM
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Re: Vibration in the 2014 grand cherokee summit

The day I picked up my first Jeep the brake rotors were so bad as soon as I hit 50 mph and hit the brakes the car was all over the place due to vibration
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  #141  
Old 02-25-2014, 12:18 PM
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Re: Vibration in the 2014 grand cherokee summit

Picked my Jeep up late last night. It now has 4 new Michelin 18" tires, and the vibration is gone. Drove it home, took the long route just to stay on the highway. Smooth as butter. While they had it, I also had them do a couple of flash upgrades. One was for the auto-on comfort features, the other was for the transmission with the V8. I'm very happy with the way it is downshifting now. No more abrupt jerks like I'm tapping the breaks as it moves through each gear.
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  #142  
Old 02-25-2014, 02:52 PM
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Re: Vibration in the 2014 grand cherokee summit

I am happy to hear that the tires have taken care of the problem.
My first 2014 Jeep had the transmission issues .
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  #143  
Old 03-25-2014, 09:17 AM
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Re: Vibration in the 2014 grand cherokee summit

Thank you to everyone on this forum - I just purchased a 2014 Summit, and the vibration problem did not become evident until I was at speeds over 65 mph. I called the dealer, who stated "well you shouldn't be driving more than 65 anyways." Obviously, I did not find this comment funny. I have taken the car to another jeep dealer, and printed out this entire forum highlighting the key points. I appreciate everyone sharing their experience.
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  #144  
Old 03-25-2014, 09:27 AM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by JeepSue View Post
Thank you to everyone on this forum - I just purchased a 2014 Summit, and the vibration problem did not become evident until I was at speeds over 65 mph. I called the dealer, who stated "well you shouldn't be driving more than 65 anyways." Obviously, I did not find this comment funny. I have taken the car to another jeep dealer, and printed out this entire forum highlighting the key points. I appreciate everyone sharing their experience.
FYI - They are finally replacing my 14 Limited because this "funny" issue was not resolvable. All of this since Oct 7th.

- 3 sets of tires
- 2 sets of 20" rims
- 3 balancings of tires
- 2 road force balancings
- Reprogrammed transmission
- Aligned drive shaft
- New "should take care of everything" hub assembles on all 4 wheels. This actually made it far worse

Non-related, but...
- Updated radio software due to freezing nav and radio (didn't resolve it)
- Ordered new radio (not even bothering to schedule the appointment to get t replaced though)
- Car alarm randomly went off. Hood latch sensor was literally fried/singed. Had that replaced as well.
- Now... transmission is acting goofy. Another thread is discussing this.

Don't allow them to brush this off. They issued a service bulletin for a reason... it's a large issue. I drove another Limited last week and it had the same vibration issues as well. I'll probably just go another route than Jeep. I just can't trust it, but we'll see what happens.
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