Vibe coming from.....

[Ray Ackerman]

I spoke to Derio (hope i spelled his name right)He is the owner of Steeda.
I asked him if Steeda was working on anything to fix the vibe on the 03 Cobra. He said not at this time,BUT the vibe is coming from the bushings on the IRS.And Ford is aware of it.

I don't know if this has been brought up already,does anyone have any info?Or know if Ford is working on a TSB for the IRS bushing/Vibe?

[HAGREEN]

my bushings on the irs were completely off and rolling around by the wheel. the compression clamps were not put on right. my delaer just replaced both rear axles

[Ray Ackerman]

Originally posted by HAGREEN
my bushings on the irs were completely off and rolling around by the wheel. the compression clamps were not put on right. my delaer just replaced both rear axles

Thanks for the info,my 03 is back at the dealer today for the Vibe.I'll ask them to check the clamps.

[Brad12]

Hi ray this is Brad,we met at the autocross at the fairgrounds,Sonic Blue 03 Cobra.Can you give me a little more detail on the vibe,when it occurs.I have a vibe that I am trying to pinpoint the cause Brad

[Ray Ackerman]

Originally posted by Brad12
Hi ray this is Brad,we met at the autocross at the fairgrounds,Sonic Blue 03 Cobra.Can you give me a little more detail on the vibe,when it occurs.I have a vibe that I am trying to pinpoint the cause Brad

Hi Brad, I remember you well.
I spoke to SVT today,there taking names and phone numbers now.Looks like the vibe is a big problem.The most common Vibe issue is the drive shaft."BUT" there are some other causes of the vibe,looks like SVT is stating a data base to get a grip on this issue.
My car starts to vibe at 80mph stops at 105mph starts again around 115mph and up.When the car vibes, feels like i'm riding on a very ROUGH road and i have ALOT of road noise coming from the read of the car.
Call SVT give them your info and the MPH your car starts to vibe,they will also ask if you still have the vibe when you push in the clutch while you are driving with the vibe.
My car is at the dealer,i'll keep you updated.

[Ray Ackerman]

Originally posted by Beabout
Hello

What is the "good" number to reach SVT about vibe issues:confused:


Thanks



1-800-FORDSVT

[Brad12]

You described my vibration to a T.Originally SVT told me it was my driveshaft but it seems to go away when I push in the clutch so the second time I spoke with them they said it was not.Now I guess we will have to wait for their solution.By the way they did have a problem with some of the driveshafts not being balanced properly.Hope they fig it out soon.

[Brad12]

PS,Ray are you going to make it to our chapter meeting this Friday?Check our site for details TampabaySVTOA.com

[Ray Ackerman]

Originally posted by Brad12
You described my vibration to a T.Originally SVT told me it was my driveshaft but it seems to go away when I push in the clutch so the second time I spoke with them they said it was not.Now I guess we will have to wait for their solution.By the way they did have a problem with some of the driveshafts not being balanced properly.Hope they fig it out soon.

I would dring it to your dealer.I don't think we have the same problem.When i push in my clutch i STILL have the vibe,I think we may have two different problems,but you never know. My car is at the dealer I'll keep you updated.

I'll do my best to make the meet on Friday,i'm going to Bradenton with my Bullitt Thursday night. It may be hard to get away Friday.I'll do my best,sounds like a great meet.

[LLCoolStang]

Excellent info Ray, thanks! Will pay more attention.check mine and see where I fit in.

[Brad12]

Mine pulled to right,they did alignment on a good machine and it is gone.The engine tick seems to be normal,all 03 Cobras I have run across have it deler and Svt say these 32 valves are noisier.The drivetrain clunk also is in every one I have run across,maybe because of our newfound torque.Hopes this sets your mind at ease on some of your issues.I have had mine since June 23rd Brad

[Beabout]

Brad12

Thanks for the reponse.. Had mine since August and all that you describe mine does also. Will be going in for first oil/filter change at dealer, will ask mine about these noises as well. Thanks again.:D

[XFIRECHIEF]

Haven't noticed any vibes on our "03 Cobra yet. Had all kinds of problems on our old "99. Had both rear 1/2 shafts replaced on that one. It looks like some "factory recalls are coming soon?
I'll have to get out this weekend, if it doesn't snow(what happened to fall) & see if it vibrates at any speed?

Does anyone notice a tranny shifting problem? I've seen better shift pattens & easier shifting too.

:confused: :confused:

[Ray Ackerman]

Dealer called me today,since my DS was replaced and tires balanced and i still have the vibe dealer was told to replace the axles.

I'll post the results.

[LLCoolStang]

Checked mine out today, vibe is most noticeable above 45 MPH, gets worse and louder the faster you go. Got it up to 90 and the hum got pretty loud, louder than the road noise, wind or S/C, very strange. You can feel it the whole time as well, from the steering wheel, seat, floor pan etc. Now that I've fully noticed it it has become very annoying, seems like it's getting worse.

I'm going to get an alignment and wheel balance as you've done Ray, and go from there.


Thanks again for the info!

[Ray Ackerman]

Originally posted by LLCoolStang
Checked mine out today, vibe is most noticeable above 45 MPH, gets worse and louder the faster you go. Got it up to 90 and the hum got pretty loud, louder than the road noise, wind or S/C, very strange. You can feel it the whole time as well, from the steering wheel, seat, floor pan etc. Now that I've fully noticed it it has become very annoying, seems like it's getting worse.

I'm going to get an alignment and wheel balance as you've done Ray, and go from there.


Thanks again for the info!

Sorry to hear you have a problem,I'm sure the dealer will fix it.Just be patience with them.It may take some time to find out what it is.

[Beabout]

Brad12

Could the vibrations come from exhaust. I understand that these Cobra's are sensative to exhaust system being fitted with tension on the rubber isolation system for the cat-back pipes. Since we both have aftermarket exhaust is it possible that the vibration is coming into the body from the pipes? :(

The ticking sound I hear from the engine sounds like what would be in push rod design loose adjustement. Since this is an overhead cam design it might just be something I need to live with.:wtf:

I have not had any alignment problems. Steering wheel correct when driving. No pull to right or left other than following road crown.

Am looking forward to anything from SVT on these issues. They afterall put the snakes together.

Just my $.02;)

[LLCoolStang]

Just back from being underneath the car about 10 minutes ago and I do have an exhaust rub from the left pipe on the bell housing, can't even fit a finger between the pipe and the housing. I already knew I had an exhaust rub,(could hear it in 1st or 2nd gear when accelerating) but only had time to locate it tonight. Is possible it's causing the vibe as well or has made it worse. I'm scheduling a visit to get the exhaust adjusted,(wish I had access to a lift) 4 wheel alignment and check the wheel balance. After that I'll give it some time to see how things shake out the procede to the next step. I'm not overly concerned or stressed over this, &hit happens and I'm certain given time it will all get worked out.

[XFIRECHIEF]

Thanks for all the posts on these problems. Please everyone, keep us posted as to what is being done by SVT FORD to correct these problems. I did take mine for a spin & there it was, the vibration you are all speaking about. Not too bad but its there.
If it snows I put the beast in storage & will have to take it in next spring for repairs.

:wtf: :wtf:

[BlueOvalBolt]

Apparently this is not a problem unique to 03's. The following link is for a guy who has dedicated a webpage to the problem. Hope it helps in understanding the problem.

http://home.hiwaay.net/~ctfrench/Driveline%20Vibration.htm

[LLCoolStang]

Originally posted by BlueOvalBolt
Apparently this is not a problem unique to 03's. The following link is for a guy who has dedicated a webpage to the problem. Hope it helps in understanding the problem.

http://home.hiwaay.net/~ctfrench/Driveline%20Vibration.htm

Wow, excellent info I must say.

[garyfisherjr]

The engine tick is probably the fuel injectors and not the valve train. My value train sings, however the injectors make a ticking sound. Try listening to the injectors and the valve train with a screwdriver, to see which one is making the noise. The other fuel injected cobras and mustangs I have owned all had noisy injectors also. i also have a small vibe between 55 and 65.

[Rocket]

Wow, new msg board, cool, been gone a few weeks.
Anyway I took mine to the dealer for the ticking and clunking, they checked the torque on the trans and driveshaft and said they couldn't find anything. I just got back, drove home and did some spirited driving 110mph 4th gear nothing major; but when I coasted to the stop light I could smell burning clutch and couldn't get it into 1st gear, had to use second to start and eventually got it into 1st at the next light. Flywheel problems?:wtf:

[Quick_Silver]

Hey guys/gals,

FYI on the clicking noise. It is due to loose cam fastener bolts. I have the same noise and SVT says that the fix is to remove the covers and torque the bolts to spec. That clicking is the cam shaft not being properly restrained.

[Quick_Silver]

FYI on the VIBE,

Yup also got that going on with the car. Have already replaced and indexed driveshaft twice. Now its on to new halves and a new rear end. There are two different rear end part numbers out there(214K and 214L). It seems that they were made in two different locations. I also suspect that one of these locations has QC issues (pinion angle off by >1 degree) which are resulting in the vibe. They also had a bad batch of drive-shafts to complicate matters. My vibe is 68Hz at 6g according to the EVA. It can be heard as a buzz/hum starting at 75mph and felt at about 85. It gets worse the faster you go. My rear diff has a stamped tag on it with the part num 214 K on it. Check yours out if you've got the vibe. I suspect a lot of you'll have the same number.

[2003Cobra]

Originally posted by Quick_Silver
FYI on the VIBE,

Yup also got that going on with the car. Have already replaced and indexed driveshaft twice. Now its on to new halves and a new rear end. There are two different rear end part numbers out there(214K and 214L). It seems that they were made in two different locations. I also suspect that one of these locations has QC issues (pinion angle off by >1%) which are resulting in the vibe. They also had a bad batch of drive-shafts to complicate matters. My vibe is 68Hz at 6g according to the EVA. It can be heard as a buzz/hum starting at 75mph and felt at about 85. It gets worse the faster you go. My rear diff has a stamped tag on it with the part num 214 K on it. Check yours out if you've got the vibe. I suspect a lot of you'll have the same number.

I think you got the numbers mixed up on the rear axle code.
Mine is 241K and has the vibration/howl above 70 mph. According to the Oasis for this problem, the new part is to be 241L. I already had the d/s changed and all it did was increase the hum/howl noise I hear above 75 mph. I'm now waiting to hear from my dealer who is supposed to have the Ford field engineer take my car for a ride above 65 mph to hear the noise. I'm betting that it will be the rear axle. Joy.

[Ray Ackerman]

Picked my 03 up yesterday after having the axles replaced.Had a BAD noise coming from the right rear.Took it back after a one hour drive.Dealer said sounds like a bad bearing in the new axles. Hope the new axles work,my dealer is great to deal with.Hope it says this way.

[Quick_Silver]

Originally posted by 2003Cobra
I think you got the numbers mixed up on the rear axle code.
Mine is 241K and has the vibration/howl above 70 mph. According to the Oasis for this problem, the new part is to be 241L. I already had the d/s changed and all it did was increase the hum/howl noise I hear above 75 mph. I'm now waiting to hear from my dealer who is supposed to have the Ford field engineer take my car for a ride above 65 mph to hear the noise. I'm betting that it will be the rear axle. Joy.


Yup! I did have my numbers mixed up, thanks. But dont hold your breath with the field engineer. I had one come out to look at mine and the best he could do was tell me to change the drive shaft AGAIN. He also refused to get in the car with me because I would be going over the speed limit; some insurance issues i guess. In any case he was no help. They have a TSB now which tells them to 1) index drive shaft 2) balance tires 3) isolate exhaust 4)change drive shaft 5) change pumpkin. And thats about what the engineer is going to tell the dealer to do.

[2003Cobra]

Originally posted by Quick_Silver
Yup! I did have my numbers mixed up, thanks. But dont hold your breath with the field engineer. I had one come out to look at mine and the best he could do was tell me to change the drive shaft AGAIN. He also refused to get in the car with me because I would be going over the speed limit; some insurance issues i guess. In any case he was no help. They have a TSB now which tells them to 1) index drive shaft 2) balance tires 3) isolate exhaust 4)change drive shaft 5) change pumpkin. And thats about what the engineer is going to tell the dealer to do.

Do you happen to know what the TSB number is?

[Rocket]

Well, I have the ticking as stated before, dealer said it was the
injectors. I know it's not. I put the car on a lift running and
walked underneath, definately not the injectors. The vibration
really concerns me. I just got the car broke in, been playing with it a little bit. Cruizing to work at 5am not much traffic;
slight vibration 45-50mph, 80-85mph holy sh*@#. On the gas off the gas 80-85 I can feel the whole car shudder. steering
wheel, floorboard, seats. Push in
the clutch, no change. Man I need to get this thing into the dealer.
This cant be good for the rear mains let alone the rest
of the car. Just as Ray posted, "Hey Ray Met you on the Bullitt Site" DHG#1794!! Now a Black 03. We need to keep posting the problems, feedback will work.:(

[Quick_Silver]

Sorry, no TSB number. The engineer who saw my car didn't even have it yet. Said SVT was just going to issue it and that he got the info through an engineer at SVT. Check with your dealer though.
As for the clicking sound. Does it sound to you guys out there like its coming from beneath the car and more so on the driver side. I've been told several different things. One SVT tech told me it sounded like an exhaust issue because it can be heard below the car. The engineer who saw the car was lost but offered that it could be an exhaust leak. Another tech told me that it was a cam/valve issue because it has a frequency 1/2 as fast as the engine RPMs. Its hard to tell who may be right.

[Ray Ackerman]

Originally posted by Rocket

This cant be good for the rear mains let alone the rest
of the car. Just as Ray posted, "Hey Ray Met you on the Bullitt Site" DHG#1794!! Now a Black 03. We need to keep posting the problems, feedback will work.:(

Yes leting the Vibe go to long is not good! I did,and now i have a speaker grill "Lightly" vibrating.

Nice to see you here! Any regrets after you let the Bullitt go?
I just could not part with my Bullitt.

[2003Cobra]

Today for the heck of it I rotated the replacement driveshaft 180 degrees and just about all of the vibe/hum seems to be gone. The yellow dots on the shaft were put in the wrong spots, or my pinion flange is marked wrong. There is also a blue paint mark at the 180 degree position on the pinion flange. I guess that is the opposite of the yellow paint mark on the pinion flange. I only tried it up to 100 mph, but it does seem to be much improved. I'll still wait and see what the field service engineer thinks whenever and if he shows up.

[Rocket]

Hey Ray,
Just got back again. Good to see you still
have the Bullitt. Any regrets, ahh, I'm sure I will but
after owning a few SVTs Mystic Cobra, 99 Lightning, I enjoyed them all. One thing I do miss from the Bullitt is the sound of that
exhaust!!. I love the supercharger but need a little beefier
exhaust. Glad to hear from you. I called SVT before I left
gave them my vibration info, just hope the tech will go for a
drive to feel the vibes. :D

[Ray Ackerman]

Originally posted by Rocket
Hey Ray,
Just got back again. Good to see you still
have the Bullitt. Any regrets, ahh, I'm sure I will but
after owning a few SVTs Mystic Cobra, 99 Lightning, I enjoyed them all. One thing I do miss from the Bullitt is the sound of that
exhaust!!. I love the supercharger but need a little beefier
exhaust. Glad to hear from you. I called SVT before I left
gave them my vibration info, just hope the tech will go for a
drive to feel the vibes. :D

Not having a good time with my 03 corba.Had the Vibe,deal replaced DS still had the vibe.Dealer replaced the axles,still had the vide PLUS a bad noise dealer said was bearings on the new axles.After the dealer replaced the axles,they said SVT wanted to replace the axles along with the differential.Picked the car up saturday still have the vibe and the noise dealer said was bad bearings.
So tomorrow it's back to the dealer to talk to the Service manager/my sales men/sales manager.
My dealer is working with me and SVT is doing the best they can.

[127bull]

:allhail: Hey Ray we never met and probably never talked but I am an IMBOC member and read the forums all the time post very little though. Sorry to hear about all your problems just wondering if your Cobras were all first run. I am looking at a 29 Aug built Cobra (so says the sticker) which is second run I believe I have not test driven it yet but was wondering if maybe Ford fixed these problems prior to the second run. I know some people have had problems from the get go so maybe Ford has had time to fix them. I really want the 03 Cobra but I have to convince the wife that its worth giving up our 02 super crew and make the Bullitt a daily driver. How do you compare the two I love my Bullitt but have always wanted a Cobra, right now I can't justify giving up the Bullitt with all the negative things I've read.
Thanks
Roy

[Ray Ackerman]

Originally posted by 127bull
:allhail: Hey Ray we never met and probably never talked but I am an IMBOC member and read the forums all the time post very little though. Sorry to hear about all your problems just wondering if your Cobras were all first run. I am looking at a 29 Aug built Cobra (so says the sticker) which is second run I believe I have not test driven it yet but was wondering if maybe Ford fixed these problems prior to the second run. I know some people have had problems from the get go so maybe Ford has had time to fix them. I really want the 03 Cobra but I have to convince the wife that its worth giving up our 02 super crew and make the Bullitt a daily driver. How do you compare the two I love my Bullitt but have always wanted a Cobra, right now I can't justify giving up the Bullitt with all the negative things I've read.
Thanks
Roy

The 03 Cobra is a great car! Mine just has some issues i've driven in alot of 03's that were perfect.
Tomorrow is the day for me,I'm done having my 03 rearend pulled apart and still having the same problem.I don't know what is going to happen,we'll see.
BTW I have a 2nd run Cobra.

[127bull]

:beer: Thanks, I guess I will just have too go test drive it darn the luck but now I know what to look for as far as problems anyway. So thanks for getting out the info that goes for all who have posted. Thanks
Roy

[Rocket]

Hey Ray and other "BULLITTHEADS".
My Cobra is a 2nd run built in SEP "9 Sep" I believe.
I have the ticking, clunk, and vibe. All of my previous rides
had their own "1st year run problems" but this Cobra for the $$
is hands down the greatest thing Fords built. I will continually
work with my dealer and other fellow Cobra owners to aid
the process in resolving our similar problems. We as
slightly obsessed SVT folks can continue to work with each other
and SVT, and dealerships to resolve our common problems.
My Own Opinion Obviously, from my experiences of course.
I think the ticking sound is not from the injectors, I put my
ride on a lift, left it running, and walked around under the car.
The noise is definately comming from the drivers side near
where the trans bolts up to the block. Could it be a clutch
quadrant? I dont really know. Ah well, I've had the car
a month and just got over 1,000 on it, just a pain taking
it to the dealer on my only day off in a month!! :huh:

[Ray Ackerman]

Originally posted by 127bull
:beer: Thanks, I guess I will just have too go test drive it darn the luck but now I know what to look for as far as problems anyway. So thanks for getting out the info that goes for all who have posted. Thanks
Roy

Good luck Roy!

[Ray Ackerman]

Originally posted by Rocket
Hey Ray and other "BULLITTHEADS".
My Cobra is a 2nd run built in SEP "9 Sep" I believe.
I have the ticking, clunk, and vibe. All of my previous rides
had their own "1st year run problems" but this Cobra for the $$
is hands down the greatest thing Fords built. I will continually
work with my dealer and other fellow Cobra owners to aid
the process in resolving our similar problems. We as
slightly obsessed SVT folks can continue to work with each other
and SVT, and dealerships to resolve our common problems.
My Own Opinion Obviously, from my experiences of course.
I think the ticking sound is not from the injectors, I put my
ride on a lift, left it running, and walked around under the car.
The noise is definately comming from the drivers side near
where the trans bolts up to the block. Could it be a clutch
quadrant? I dont really know. Ah well, I've had the car
a month and just got over 1,000 on it, just a pain taking
it to the dealer on my only day off in a month!! :huh:
I have the same ticking noise coming from the same area.I'm not going to doing anything about it right now.I think if it was a problem i would have some sign coming from the engine.The engine runs like a fine clock. :D

[kevint]

I too had the 80 mph vibe, it required two driveshafts to fix the problem. An SVT field engineer brought a certified zero balance driveshaft to install on my car. After installation, engineer and I went for a drive - 80 mph no vibe 110 mph no vibe. Since then, I've been to 140 with no vibe. I'm glad it wasn't the rear end or another problem. Be patient guys, you will be taken care of. SVT did a good job with this car, I'm sure it bothers them when things like this happen on such a *****en car!

[Ray Ackerman]

:cool:

[Quick_Silver]

:bash:

Yeah, I feel you on that one. I have all the same problems minus the pull problem. My car has been to the dealer 9 times. I've had 3 drive-shafts, 2 sets of axles and the new 241L rear end. The vibe is still there and I just found out that all that thumping is the result of too much backlash in the new rear end. So I'll be in to the dealer again to have that changed. I know its a lemon and so does the dealership. I am almost positive that SVT knows exactly what the problems are with their early production cars and is sitting on the info. Leaving us the unsuspecting consumer to fend for ourselves. If you go for the lemon law, try for a new car with a build date after Nov 11th. i suspect that all the problems have been fixed after that production halt.

[Ray Ackerman]

:cool:

[Rocket]

:confused:
Just got the drive shaft replaced,
will post results as soon as I get some road and
no traffic, to test. The rough vibe at 80-85
seems to have gone, but there's still
a vibe, goes away when I push in the
clutch, I've matched RPMs clutch depressed
and the vibe isn't there. Only when in gear.
Will be checking on gear and RPM combinations
for data. Anyone else have any ideas or
similar vibes?
:cbra:

[norcal_cobra]

LLCoolstang,

Don't forget that FOrd will do the re-alignment for free under warrenty, given that your Cobra has less than 12,000 miles on it.

-norcal_cobra

[LLCoolStang]

Originally posted by norcal_cobra
LLCoolstang,

Don't forget that FOrd will do the re-alignment for free under warrenty, given that your Cobra has less than 12,000 miles on it.

-norcal_cobra

Yep, I know. But I would rather get it done right the first time rather than go back seveal times for the same problem as others have experienced. It would actually cost me more money,(lost time/productivity) to leave my car at the dealer and revisit the same problem over and over.

Something that is a big ticket item such as rear end or transmission I would handle differently. Mine will be going in at 3000 miles for clutch inspection,(shudder), engine tick and it has stalled 6 times total so far since Oct 3rd delivery. Beyond that everything else seems to be good and am happy with the my ride :tmb:

[Bigjht]

I know there have been a lot of posts about this but from my search I couldn't find any recently. I'm having the same problems with a high speed Vibration. I have a 99 GT with an 03 Transmission and IRS. I had the driveshaft balanced, the wheels/tires balanced, and bought the Maximum Motorsports aluminum diff. bushings, which made it better but still nowhere near smooth. Has there been any recent findings about this. I've been reading about rearends being replaced and driveshafts being replaced under warranty but I can't get that. I thought I'd check to see if any updates have came out. I have a track day with the Atlanta chapter this weekend and I've been battling this for about 4 months now with little improvement. I'm on vacation this week so this is my focus all week. Thanks for any help.

[TI BRIN]

[QUOTE=Ray Ackerman]Dealer called me today,since my DS was replaced and tires balanced and i still have the vibe dealer was told to replace the axles.

I'll post the results.[/QUOTE

is your axles are changed ?and is fix your vib? :huh: :confused:

[SgtMaj]

Ray, I had the vibe when I first bought my '03 cobra. Went round and round with the dealer I purchased it from. Had the drive shaft replaced twice, the tires balanced but nothing worked. They had a Ford engineer in. He said it was just "normal harmonics". I'm not a 16 year old kid by a long shot. His B.S. didn't wash. The car shook so bad at 65-90 you couldn't use the rear view mirror. SVT closed out the ticket and I took it to Team Ford in Marietta, Georgia. They replaced the entire rear end and the drive shaft. It's smooth as silk now. Hope yours gets worked out.

[EbloomPonycar]

Any more info on this vibe issue. Just went for a 700 mile ride down south and the vibe over 80 is awful. Feels like something will come apart eventually. Mine has a vibe that starts at 60 then seems to go away until 80. The rearend also whines at 78 on up. They just replaced the left front tire and driveshaft and aligned the car. Same vibes. Is it worth calling SVT to complain or get more info.

[JRHWhiteSnake '04]

...I have a 99 GT with an 03 Transmission and IRS. I had the driveshaft balanced, the wheels/tires balanced, and bought the Maximum Motorsports aluminum diff. bushings, which made it better but still nowhere near smooth. Has there been any recent findings about this. I've been reading about rearends being replaced and driveshafts being replaced under warranty but I can't get that.
All the vibe probs i've read about seem to be fixed on the '04 Cobra.
I heard that the DS is (mis-)matched to the rear end, and not perfectly balanced in itself. People with IRS who change rear end ratio's often find themselves with the vibe afterwards.
You might want to look into the carbon fiber drive shafts to solve your problem.

[EbloomPonycar]

They just put a new driveshaft in a few weeks ago. I find it hard to believe they are paying closer attention to the drive shafts than they did three years ago. With a change of the driveshaft there was absolutely no change in the vibration leading me to believe the cause is something else. The driveshafts are aluminum and maybe they transfer more of the rear harmonics than a steel or carbon fiber unit. Who knows. Back to the dealer maybe next week to see what else they say.