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Unread 01-02-2008, 07:50 AM   #1
facultus
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2006 Grand Cherokee shudder and vibration

Has anyone else had this problem-the shudder and vibration at particular speeds? Mine kicks in uphill at about 55-65 MPH. Its not the tires, I've had those checked. Plus, the shudder stops once I take my foot off the accelerator.

From looking at other forums, it looks like the torque converter is the issue.

There is a service bulletin to flash the ECM to improve torque converter performance and I've seen other people have good results replacing the drive line AND torque converter.

I'm taking the car in tomorrow and if anyone has had this problem fixed I'd like to find out what they did so I "direct" the tech guys to the solution.

Thanks in advance.

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Unread 01-08-2008, 12:25 AM   #2
dpidutti
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I think I have a similar issue

Mine only does it occasionally, maybe once or twice during a 500+ mile trip and only if the car is loaded down with passengers/luggage. For me it happens mostly at 60-70mph at 1900-2000 rpm while climbing. I use cruise control a bunch so really notice it when the car is trying to maintain speed during a climb. Happened again today on the way back from Tahoe to So Cal, can't consistently reproduce it yet.

Sound similar?
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Unread 11-28-2011, 07:32 AM   #3
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i know it is an old post, but do you have a specific solution to this problem ?
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Unread 02-18-2012, 08:15 PM   #4
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Yep, sounds exactly like mine. I hope it's not the torque converter.
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Unread 02-20-2012, 06:58 AM   #5
callea
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I'm having an issue that sounds the same. Its a random fairly violent shudder that happens out of nowhere and really startles you. Only lasts for about a second then back to normal. Happens to me around 40-45 mph. I never get a CEL but sometimes some of the lights on the dash will come on momentarily. I wish I could f\igure out what the hell it is.
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Unread 03-04-2012, 11:13 AM   #6
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I noticed the isolator on the upper front differential mount is broken and the lower mount is starting to crack. I think this may be causing my problem. I'm gonna replace them later this week.
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Unread 03-05-2012, 09:44 AM   #7
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Quote:
Originally Posted by callea View Post
I noticed the isolator on the upper front differential mount is broken and the lower mount is starting to crack. I think this may be causing my problem. I'm gonna replace them later this week.
let us know if it helps
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Unread 03-08-2012, 08:26 PM   #8
callea
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Replaced the isolator on top of the front diff (it was in bad shape) and the lower mount in front of the diff (it was just starting to crack. The left isolator was in good shape so I didn't replace that. Been driving for 3 days and seems to have fixed the problem (we were experiencing the problem at least once a day before doing this). This symptoms that this fixed were a rather violent/startling shudder/shaking in the front end that occured either holding speed or decelerating at about 40 mph and lasted for about 1 second then cleared up. It also fixed the clunk that we were experiencing when shifting into Drive.
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Unread 03-09-2012, 12:02 PM   #9
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Quote:
Originally Posted by callea View Post
Replaced the isolator on top of the front diff (it was in bad shape) and the lower mount in front of the diff (it was just starting to crack. The left isolator was in good shape so I didn't replace that. Been driving for 3 days and seems to have fixed the problem (we were experiencing the problem at least once a day before doing this). This symptoms that this fixed were a rather violent/startling shudder/shaking in the front end that occured either holding speed or decelerating at about 40 mph and lasted for about 1 second then cleared up. It also fixed the clunk that we were experiencing when shifting into Drive.
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Unread 03-09-2012, 12:29 PM   #10
yzjwk
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Quote:
Originally Posted by facultus View Post
Has anyone else had this problem-the shudder and vibration at particular speeds? Mine kicks in uphill at about 55-65 MPH. Its not the tires, I've had those checked. Plus, the shudder stops once I take my foot off the accelerator.

From looking at other forums, it looks like the torque converter is the issue.

There is a service bulletin to flash the ECM to improve torque converter performance and I've seen other people have good results replacing the drive line AND torque converter.

I'm taking the car in tomorrow and if anyone has had this problem fixed I'd like to find out what they did so I "direct" the tech guys to the solution.

Thanks in advance.
If you have the v6 with the NAG 1 trans , according to http://www.allpar.com/mopar/transmis...AG1-WA580.html
They have this shutter with any sort of water contamination as well as the torque conveter .
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Unread 03-09-2012, 07:11 PM   #11
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Quote:
Originally Posted by yzjwk

If you have the v6 with the NAG 1 trans , according to http://www.allpar.com/mopar/transmis...AG1-WA580.html
They have this shutter with any sort of water contamination as well as the torque conveter .
Every once in a great while (happened maybe 3 times since I got it, with and without lift) it'll kinda chug/lug/pulsate up hill maintaining speed at a low rpm. A guy at work says his friends 3.7 wk did it and was diagnosed with something wrong with the output shaft. Other stuff online I've read it's pretty common with nothing ever discovered to be wrong. I would assume if mine was contamination it would do it more often right?
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Unread 03-11-2012, 07:16 AM   #12
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Mine does it every time when in [D] and when slight acceleration is needed (5.7L) in the range of 35-70mph. It used to start from 45mph but it's gotten worse. It's so annoying. If I let go of the accelerator, the vibrations immediately stop but if I apply it again by feathering, the vibes retrurn. If I 'punch' it down - no vibes but I can't always drive like that either, too much fuel usage.

I checked the 3 front diff bushes and all are good, the driveshafts "seem" OK. I'm beginning to think it's either the solenoid kit (as my ECM threw range sensor fault codes a number of times) or the torque convereter.

Now I'm stuck with the dilemma, to order the new solenoid kit with range sensor and replace it and flush the transmission and torque converter fluids or replace the torque converter. If I do both and it fixes the problem, I won't know which part was it exactly and there's a great price difference between the two. If I do one at a time and it turns out that I have to replace the other, then all the fluid's gone to waste. Also, replacing the solenoid kit is a piece of cake, whereas with the TC, I have to drop the transmission.

I'm saying this as I narrowed it down to these two, per fault code and torque converter vibrations but still not 100% sure it's the TC, as it should screech if it's faulty (??? not sure if it does that every time it's faulty though). But then again, my fuel economy has dropped as well, which again points to the TC, from 14.7MPG to 11.7MPG on mixed highway, same conditions, same routes and different MPG's since the problem developed.
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Unread 03-12-2012, 06:41 AM   #13
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i'll second that it happends on a up hill climb at 55-65 mph with the cruise set.. Is it time for a trans filter change?
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Unread 03-12-2012, 07:51 AM   #14
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Quote:
Originally Posted by t3kmitch View Post
Every once in a great while (happened maybe 3 times since I got it, with and without lift) it'll kinda chug/lug/pulsate up hill maintaining speed at a low rpm. A guy at work says his friends 3.7 wk did it and was diagnosed with something wrong with the output shaft. Other stuff online I've read it's pretty common with nothing ever discovered to be wrong. I would assume if mine was contamination it would do it more often right?
Trans fluid is hygroscopic like break fluid .Unlikle the breaking system though , the trans fluid should also have the ability to vaporize and release the water . But Ya i would think it would be more often as well .I guess this might apply to all the posts here but When the lugging etc. problem occurs, have you ever tried to manually downshift out of OD ,1 or 2 gears ? that should release the torque converter . If the problem goes away , i would think it's a lazy sensor Input or something in the tcm that is causing the t.c to stay locked .Just a thought anyways ,
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Unread 03-12-2012, 08:41 AM   #15
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THIS BULLETIN SUPERSEDES SERVICE BULLETIN 21-011-05, DATED APRIL 23,
2005, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE
HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE AN UPDATED VEHICLE BUILD
DATE AND MODEL YEAR.
SUBJECT:
NAG1 (W5A580) Transmission - Shudder When Torque Converter Clutch Engages
OVERVIEW:
This bulletin involves thoroughly flushing the NAG1 (W5A580) transmission of any water
contamination, replacing the transmission filter, and applying RTV sealant around the base
of the transmission fill tube to prevent water intrusion past the fill tube seal.
MODELS:
2005 - **2006** (LX) 300/Magnum/Charger
2005 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles (WK w/3.7L, LX w/ 5.7L, or LX AWD w/3.5L)
equipped with a NAG1 transmission (sales code DGJ). For LX vehicles, this
bulletin applies to 2005 and 2006 vehicles built prior to May 13, 2005 (MDH
0513XX). **For WK vehicles, this bulletin applies to vehicles built prior to
June 03, 2005 (MDH 0603XX)**.
SYMPTOM/CONDITION:
The customer may experience a transmission shudder when shifts occur. The shudder is
most noticeable with partial application of the torque converter clutch in 3rd and 4th gear.
DIAGNOSIS:
If the customer experiences the condition perform the Repair Procedure.
NOTE: This condition may occur when only a small 0.5% concentration of water is
present in the automatic transmission fluid. It will be very important to
ensure that the transmission and torque converter is thoroughly flushed of
any water and other possible contaminants.
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