Like I said, you don't feel it as much in the newer cars because they have them set up to slip very easily. Have you ever driven a 70's Camaro or any other muscle car with a built up posi rear end?? Come on, this is a common thing. Those things would hop all over the place while making tight turns.

Exactly, the "Friction Modifier" makes the clutches Slip more smoothely/easily...

It shouldn't shudder, or shimmy. You'll just sometimes feel the clutches grab a little, that's all. There's obviously a problem with some of the new Ford's rear end if they're shuddering going in a straight line.

I'm not going to argue, but I'm not making this up...

 

My 4x2 Supercrew with 4600 miles and 3.55 LS rearend would shudder about twice a week when making a left hand turn from a stop under acceleration. After reading this post I spoke with my service dept, told of my problem, and he said if they couldn't duplicate the problem they would do nothing. Since it doesn't occur that often, I didn't take it in as I figured I would take the chance of wasting my time and nothing being done anyway or the tech might try to tear the truck up on the road test (am weird I guess). I dropped the rearend cover myself and drained into a clean pan. The grease was grey dishwater colored with no metallic shavings but rather from the friction material on the clutch packs I guess. I was going to install some Amsoil 75W90 Series 2000 gear oil I had, but decided against it and purchased 3 qts of 75W90 Motorcraft synthetic gear oil at $17 a qt with a bottle of friction modifier. Kept a copy of the receipt on the gear oil as I expect further problems down the road with the clutch pack. The bottom of the rearend housing was also clean with no debris. Will have to see if and how long this new gear oil lasts before the shudder occurs again, if it does.

 

O.K., as I stated above, I had my appointment with my Ford Service Dept. today. I must say that I was/am pleasantly surprised at the outcome. I dropped my vehicle off last night (Sunday) so that could drive the truck from a cold start to experience the "shudder" today (Monday morning). I got a call at 9:15AM today from the Service Dept. letting me know that my truck was ready for pick-up. They said the Oil-change was done and the "AXLE CLUTCH PACK" has been ordered to fix the shudder problem!!!! I wrote a letter last night explaining how to duplicate the shudder problem, and put it in the Key Drop-Off Box last night at the Service Dept. The letter I wrote was nothing very detailed, but I did explain exactly what to do to reproduce the shudder (I can post this letter if someone would like to see/use it for themselves).

Anyway, here is the Special Service Message and TSB regarding the Shudder problem. Note: The Service Dept. Manager immediately went to their Ford database to search for the term "Shudder" to find this info. He advised me that he did not even take the truck out for a test drive!!! They just ordered a new clutch pack.



Also note that in the Special Service Message that they talk about the Shudder feeling as if it comes from the FRONT AXLE OR THE STEERING GEAR!!! This is exactly what some other folks have said about the sensation. So, I guess it may be the Rear End Clutch Pack even though you feel the sensation in the Steering (Front End).....

Again, here is the receipt the Service Dept. gave me for the newly oedered Rear End Clutch Pack:


Mar 15 04 O7:lSp FatBo Productions i 401 377 4814 p.1
1FTPW14594KB12914 Page 1 of
OASIS RESULT: *107 423 241* TECH HOTLINE CONTACT ID EXPIRES IN 03115/200.
I FTPWI 4594KB1 2914 DAYS FOR 1FTPWl4594K812914 07:42:3
© Copyright 2002-3 Ford Motor Company. All rights reserved.
VEHICLE INFORMATION
VEHICLE DESCRIPTION BODY STYLE ENGINE ENGINE CALIBRATION

TRANSMISSION AXLE CODE
B6
GENERAL WARRANTY INFORMATION
WARRANTY START DATE BUILD DATE SALE MILEAGE
10/22/2003 10106/2003 00009
WARNING MESSAGES
LESS THAN TWO DEALER APPROVED AWA REPAIR VISITS PAID TO DATE
VERIFY STATE REGISTRATION, yIN MAY BE ELIGIBLE FOR CALIFORNIA EMISSIONS WTY
flIITTAMflIMfl FIPI fl SFPVICF AflTIflhIq
NO CAMPAIGN MESSAGE(S) FOUND
EXTENDED COVERAGES
NO ESP INFORMATION AVAILABLE
REPAIR HISTORY
0111912004 DEALER: Valenti Ford, Inc.
WARRANTY CLAIM NUMBER: 318994 ODOMETER: 005362M
REPLACE DOOR SPEAKER COVER VERIFIED REPAIR
n,sn’rr’ tr%nr •.,rfln,i. A -TIflI
c..%SLJL_. tOn ‘*..fl.-k
509000 - DRIVELINE AXLE CONCERNS
SPECIAL SERVICE MESSAGE
17466 2004 F-I5OIEXPEDITION!NAVIGATOR - CHATtER, SHUDDER, BINDING SENSATION, OR VIBRATION FROM LIMITED SLIP REAR AXLE DURING LOW SPEED TURNS
SOME 2004 F-150/EXPEDITIONINAVIGATOR VEHICLES EQUIPPED WITH A 9.75 INCH OR 8.8 INCH LIMITED SLIP REAR AXLE MAYMAY EXHIBIT CHATTER, SHUDDER, A BINDING SENSATION, OR VIBRATION DURING LOW SPEED TURNS. THE SENSATION MAY FEEL LIKE IT ORIGINATES FROM
THE FRONT AXLE OR THE STEERING GEAR. ATTEMPT TO DUPLICATE WITH THE VEHICLE IN
2WD (TO ISOLATE THE REAR AXLE). TURN THE STEERING WHEEL FULLY RIGHT OR LEFT AND
ACCELERATE THE VEHICLE. IF THE CONDITION IS VERIFIED TO BE IN THE REAR AXLE, REPLACE
THE AXLE CLUTCH PACK USING KIT 3LIZ-4947-AA FOR THE 9.75 INCH AXLE OR 3LIZ-4947-BA
FOR 8.8 INCH AXLE. FOR CLUTCH PACK INSTALLATION INSTRUCTIONS ON
EXPEDITION/NAVIGATOR, REFER TO THE INSTRUCTION SHEET ENCLOSED IN THE KIT. FOR F-
150, REFER TO 2004 WORKSHOP MANUAL, SECTION 205-00 BUT USE THE PRE-SELECTED SHIM PROVIDED IN THE KIT.
THERE ARE NO TSBS FOR SYMPTOM ENTERED
597997. DRIVELINE NOISE CONCERNS
SPECIAL SERVICE MESSAGES
17466 2004 F-I5OIEXPEDITION!NAVIGATOR - CHATTER, SHUDDER, BINDING SENSATION, OR VIBRATION FROM L1MITED SLIP REAR AXLE DURING LOW SPEED TURNS
MESSAGE TEXT DISPLAYED UNDER A PRIOR CODE
TECHNICAL SERVICE BULLETINS
04-01-06 1998-2004 F-150 4X4: TRANSMISSION, NOISE - DRIVELINE CLUNKING/GRUNTING NOISE OR SHUDDER SENSATION DURING LIGHT TO MODERATE ACCELERATION AND/OR BRAKING
END OF OASIS REPORT FOR 1FTPW14594KB12914

 

Just for awareness, in that Ford is aware, and if you read the above post, you will be aware to.

I doubt any new trucks coming off the line are going to have this shudder issue, since Ford has acknowledged it.

My question/curiosity is: What's the difference between the bad Clutch Pack and the new ones they are putting into these vehicles to resolve the issue....????

 

I have a truck built in 1/04 and have the vibration issue at 40-55mph. Took my truck in for the second time this morning. The first time I took it in, they did a road force balance and took care of a vibration problem at 70+mph.
They just called me back a couple of minutes ago and said that both passenger side tires had small splits in the steel belts. For the record, I have the standard BFG A/T tires that come on the Lariet.
It's going to take 2 weeks to get replacements in. The service guy told me that there were no safty concerns, just have to live with the vibration until the new tires come in. He seemed almost positive that this was the problem. Also, he did a check on the vibration kit and clutch pack and said that since my truck was a late model, these problems should have already been addressed.

I wonder if I'm the only one with a tire problem like this??
Anyone out there with any comments?

 

Just wanted to leave my two cents. I just brought my truck into te dealership before I investigated this online, sure enough they diagnosed this over the phone, a qwick road test and it was confirmed, the clutch pack needed replacement, its done. As far as other problems with regards to road vibration, I just received an updated warranty extension on my tires, now they are covered on the vehicle warranty for up to 3 years 36,000 miles. Specifically the Ford update talks about: if you experience vibrations from the wheels at speed your tires are defective.

goodluck,

Stephen Tise

 

Good grief. My dealer told me they were replacing it and I didn't even ask about it or mention it was a problem. It was in for something else and the tech noticed it and so they came out and said hey you need a new clutch pack...when do you want to schedule it? I'm like...uh...next Friday I guess.

They did put the additive in AFTER replacing it. I saw it on the work order.

 

I havent really felt a shudder on turns but I have felt it when the truck is cold and accelerate fairly fast has anyone else noticed this.
I have the rear end howl and would like for the clutch packs be replaced while they working it.

 

ford has a tsb for the clutch packs in the rear end:take your truck to a ford dealer and have them fix it

 

I had the clutch packs replaced in my FX4 about 2 months ago because I had a pretty bad shudder at the first stop when it was cold. It fixed her right up...

Unfortunatly, when they replaced the clutch packs, they screwed something else up and caused a popping feeling everytime I started off from a stop.

Took the truck back in... I've got a new drive shaft on order. Do you guys know if they replace the drive shafts with the new and improved aluminum ones?