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Old 03-14-2014, 07:49 AM
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Highway shaking

Just curious to find out if anyone else is getting intermittent shaking with their SFU? I've noticed it occurring more frequently when traveling at apprx 65 mph and letting off the accelerator to coast. It's almost as if the transmission won't let go of the gear to fully coast and it starts rattling the entire Jeep rapidly (not in the steering wheel). More concerning is it did it the other day when accelerating and it felt like the jeep was jumping. (I guess i need to tame the beast). I'm going to take it out of eco mode for the next few days to see if it's the fuel delivery cut off (IDFSO), but I'm worried its something in the drivetrain (clutch, transfer case, torque converter). I've searched the forum at it doesn't appear to be the "shimmy" issue others were having in the past.

4x4 limited with apprx 4,500 miles

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Old 03-14-2014, 09:38 AM
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Re: Highway shaking

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Originally Posted by Zeus View Post
Just curious to find out if anyone else is getting intermittent shaking with their SFU? I've noticed it occurring more frequently when traveling at apprx 65 mph and letting off the accelerator to coast. It's almost as if the transmission won't let go of the gear to fully coast and it starts rattling the entire Jeep rapidly (not in the steering wheel). More concerning is it did it the other day when accelerating and it felt like the jeep was jumping. (I guess i need to tame the beast). I'm going to take it out of eco mode for the next few days to see if it's the fuel delivery cut off (IDFSO), but I'm worried its something in the drivetrain (clutch, transfer case, torque converter). I've searched the forum at it doesn't appear to be the "shimmy" issue others were having in the past.

4x4 limited with apprx 4,500 miles
AFAIK, the programming for the transmission has it hold the gear now to maximize engine braking to minimize wear and tear on the brakes (remember this from some other thread).

That said, I get vibration occasionally however it appears to be a combination of the roads being trashed this winter, ice/sand/salt buildup inside my wheels, and from what I recall the stock tires are a beast to balance and there have been many complaints about similar things with it.
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Old 03-14-2014, 10:00 AM
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Re: Highway shaking

My beast lives in Florida and the roads are all pretty good down here. With that said, the dealership did say that there was a "program update" that needed to be done and wonder if it has anything to do with what you've mentioned. I'll post a reply once I get her back to see if the update did anything.

Thanks for the reply!
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Old 05-06-2014, 11:24 PM
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Re: Highway shaking

Well after computer upgrade the shaking shortly returned. I took it in and they had it for over a week, but may have gotten somewhere. After going for a ride with the tech they determined it was possibly the valve body on the tranny and replaced the whole thing. It's only been 15 miles, but I can tell it shifts more smoothly now and I haven't noticed any shaking. Another thread in a different forum calls it "the fish bite" and although the tech didn't really admit to hearing the term before, he really wasn't all that surprised.
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Old 05-07-2014, 06:21 PM
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Re: Highway shaking

Mine just started shuddering mildly. It only does it while cold. I'm thinking its the valve body as well.

Here's what happens. I startup and back down my 500 ft drive out onto the road. Place it in drive and accelerate lightly up a mild 2 mile grade with a 100 ft altitude change. When I am near the top, I hit the 5 to 6 gear (maybe 6 to 7) change, at 50 mph, and I get a rapid shudder as if I am driving over bulldozer track marks in the pavement. I let off the gas and ease back into it and it's gone. I thought it was something on the road the first time, then noticed it on a mild grade in town just after cranking up and leaving a store. Similar gear change and speed. I thought it could be a u-joint or failing CV.

After reading this thread, I think my valve body is slowly degrading and that explains the cold operating symptoms of slight power loss on shifts (delayed gear engagement), and now shuddering.

Its not bad enough to worry, just minor symptoms. I was just saying that I am trouble free in another thread. At least its not diesel related! Looks like I might get my first doctors appointment after 14k of operation.
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Old 05-07-2014, 10:35 PM
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Re: Highway shaking

That's exactly what mine was doing. Take it in and tell them it's "fish biting." It seemed to have been the buzz word.

I've driven mine maybe 40 - 50 miles since the change and its running silky smooth and although premature...couldnt be happier. Maybe it would have been as simple as just changing out the tranny fluid?

P.s. We do have 100k drivetrain warranty right? :-/
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Old 05-07-2014, 11:21 PM
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Re: Highway shaking

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Originally Posted by Zeus View Post
That's exactly what mine was doing. Take it in and tell them it's "fish biting." It seemed to have been the buzz word.

I've driven mine maybe 40 - 50 miles since the change and its running silky smooth and although premature...couldnt be happier. Maybe it would have been as simple as just changing out the tranny fluid?

P.s. We do have 100k drivetrain warranty right? :-/
Thanks. It sounds like your on the road to "fish bite" recovery. I will be visiting the shop soon.

We do have the 100k powertrain warranty. Good point. I'm a little concerned with the air suspension and other tech features. I have 6 months before I have to decide so I'll wait on the extended warranty for now.
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Old 08-20-2014, 08:01 AM
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Re: Highway shaking

I know this is an older thread but, mine started shimming last Friday afternoon at 62 mph so I let out of the accelerator to assess the situation. I could duplicate the problem multiple times then but I can't now. I first thought it was the road conditions but the road was in the same condition its been in last 10+ years of travel. Then my wife started having problems this morning with the cruise set at 57 mph. I guess a trip to the dealer is in my future.
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Old 08-20-2014, 08:04 AM
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Re: Highway shaking

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Originally Posted by jtwoodiii View Post
I know this is an older thread but, mine started shimming last Friday afternoon at 62 mph so I let out of the accelerator to assess the situation. I could duplicate the problem multiple times then but I can't now. I first thought it was the road conditions but the road was in the same condition its been in last 10+ years of travel. Then my wife started having problems this morning with the cruise set at 57 mph. I guess a trip to the dealer is in my future.
My fiance had similar issues. We're in the snow belt and had serious issues with potholes in the area. She hit a bad one and ruined three of her rims that required repair or replacement. It could be an alignment issue, so hopefully it won't require too much repair. Good luck!
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Old 08-21-2014, 04:47 AM
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Re: Highway shaking

After multiple attempts at repairs including replacing the entire transmission and the torque converter, the issue was never resolved. I ended going through the lemon law process and had chrysler purchase the vehicle back. I tried to convince myself to stick with the GC, but couldn't justify it after seeing other people with similar problems with gas engines as well. I was sad to see her go, but was very impressed with the way chrysler dealt with the situation.
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