SCMC Message Forum  
Go Back   SCMC Message Forum > SVT Platforms > '03-'04 Cobra Forum
User Name
Password

Register FAQ Members List SCMC Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread
Old 11-06-2008, 06:36 AM   #1
98cobra1
Registered User
 
Join Date: Nov 2008
Posts: 5
2004 Vibration

Hey i need help!! I have been a mustang owner for years and I purchased a 2004 cobra convertable with 6400 miles on it in May. the car bringing it home from new york had a bad vibration at 60 and up. owner said probably flat spot and he would pay for tires. Once home we discovered possible previous damage to the front end as the control arm pass side and kmember were moved 1/2 inch back and control arm bent. lamatta performance here in Orlando has exausted efforts to find it??? We have first check frame it is straight put new springs,shocks,front control arms, new cat back,strut tower brace,full length sub frame connectors, alignment, new tires,changed wheels from one that was ok,rebalanced drivshaft and swaped out the intire IRS from a donan car and no change??? The car drives straight as an arrow and has very slight vib at 55 to 60 and at 62 to 68 shacks you brains out and then settles out at 70 to mild vib until 80 and then is not to noticable. Please if you have any ideas let me know. thanks for your help Cobra98
98cobra1 is offline   Reply With Quote
Old 11-06-2008, 07:58 PM   #2
totenkopf13
Jerry "Chief Ten Beers"
 
totenkopf13's Avatar
 
Join Date: Sep 2008
Location: Central FL
Posts: 22
Hopefully, someone on here will have some insight. Seems you have run through most of what one might think would cause such. I have no idea.
__________________
Website: http://totenkopf13.gotstang.com
totenkopf13 is offline   Reply With Quote
Old 11-06-2008, 09:07 PM   #3
cobrabitn
Dr Jekyll on the street, Mr Hyde on the track
 
cobrabitn's Avatar
 
Join Date: Jun 2001
Location: Rock Hill SC
Posts: 14,617
Send a message via AIM to cobrabitn
You need a competent shop that can find the vibration but I would first check the following:

1. U-joints & bearings.

2. Your driveshaft is warped and even though you may have balanced it, if it is "out of round" it will vibrate at certain speeds.

3. Your driveshaft is not indexed properly, you will need a good shop to properly index your driveshaft. If your car is lowered, you changed the angle of which the shaft has with the transmission.

4. Your tires need balancing or have a broken belt inside of them.

Check these three items and most likely your vibration will be gone.
__________________
Cobrabitn



2016 Ruby Red Metallic with Caribou accent F-350 Crew Cab

Stump Puller! 6.7 Diesel Automatic with Chrome Package, Off Road Package, 3.55 Locking axles, and Ultimate Lariat Interior Trim Package!

2017 Shelby GT350 Coupe - track car!

Mods:

JLT True Cold Air oil catch can


2009 Vista Blue Shelby GT 500 Coupe - Garage Queen

Tinted Windows
JLT True Cold Air Kit
Pro-Dyno Tune
526 rwhp - 511 rwtq


1994 Rio Red Indy Pace Car #22 "Runabout"

Snake in the grill
MGW shift knob
1996 SVT Cobra Wheels


1969 New Lime Mustang Mach 1 Sportsroof - Second owner - bone stock with shaker.

One SVT Cobra, one Shelby GT500, one 69 mach 1, and a Shelby GT350 is better than nothing!

Custom Data Plates for your Mustang or Ford!

Buy "Cool Merchandise" at Data Plates Plus
www.dataplatesplus.com

See my MSR Video here!
cobrabitn is offline   Reply With Quote
Old 11-07-2008, 06:53 AM   #4
98cobra1
Registered User
 
Join Date: Nov 2008
Posts: 5
Thanks Tires have been swaped from my 98 cobra no change but I will talk to the driveshaft shop to see if they checked to make sure it was perfectly round and indexing. Thanks 98cobra
98cobra1 is offline   Reply With Quote
Old 11-07-2008, 07:26 PM   #5
cfradam
Registered User
 
cfradam's Avatar
 
Join Date: Feb 2008
Location: orlando
Posts: 121
Jakes a good guy to have work on your car.I had the same thing happen to my 95 gt.I also did most of the things you did to find the problem.after months of beating my head on a rock and swiping the magnetic strip off the back of my credit card it turned out to be a bad u joint.just make sure that you check the small stuff twice before throwing a lot of money out the window.
ball joints,tie rod ends,poor rack bushings,excessive pinion angle,and u joints will all give these symptoms.
good luck

Adam
cfradam is offline   Reply With Quote
Old 11-08-2008, 08:14 AM   #6
98cobra1
Registered User
 
Join Date: Nov 2008
Posts: 5
Adam yes Jake is the best and has been a friend for nearly 13 years. He is finishing my 92 GT Monday. I will relook at the small things also. I took the driveshaft to advanced driveline so I would hope that they looked at all issues but I will call them today to make sure. We took a donan shaft out of a car at Jakes shop and it still vibrated so not sure about the driveshaft. I also am having a friend set up a camera to video the car under neath to see if we can see it as it starts to happen. Thanks everyone for your help. John
98cobra1 is offline   Reply With Quote
Old 11-09-2008, 04:50 PM   #7
9Cobra9
Registered User
 
Join Date: Feb 2005
Location: Lawsonville
Posts: 123
Send a message via AIM to 9Cobra9
Idon't know what to tell ya i have heard where people have vibration problems out of the 03-04 cobras. I think i found somethin on either SVTP or SVTOA it was one of the two
__________________
2004 Competition Orange Cobra Vert




SOLD: 99 Ultra White Cobra

03-04 cobra front bumper, 2 chamber Flowmasters, Mac H-pipe, 3 1/2 stainless tips, JLT CAI, Eibach Pro Kit Springs, stainless cobra pedals, cobra floor mats, Pro 5.0 Short Throw Shifter, FRPP Aluminum Driveshaft, FRPP 3:73 Gears, Pro Dyno Tune 312RWHP 316RWTQ
9Cobra9 is offline   Reply With Quote
Old 11-09-2008, 10:31 PM   #8
cfradam
Registered User
 
cfradam's Avatar
 
Join Date: Feb 2008
Location: orlando
Posts: 121
advanced driveline is also top notch and could be trusted to not overlook anything.the only other thing I can think of is that my balancer started to seporate and made a big vibration.the only thing was that it usually comes apart quick with litle notice.just something else to look at
cfradam is offline   Reply With Quote
Old 11-11-2008, 12:56 AM   #9
COBRA_ESQ
Registered User
 
Join Date: Aug 2006
Posts: 31
There is a TSB for vibrating driveshafts in 2003 Cobras. Do not know if it included 2004.

If it was not for the front end damage I would say that is almost definitely it.
Mine started at 55mph and smoothed out at about 70mph. Replacement driveshaft took care of it. I have also been told that if you remove the drive shaft to mark the universals so it goes in the same way it came out.
COBRA_ESQ is offline   Reply With Quote
Old 11-11-2008, 01:13 AM   #10
puzzle13
SCMC Member
 
Join Date: Nov 2004
Location: Raleigh, NC
Posts: 634
I have a 2003 Cobra Convertible that I bought new and it has a slight vibration from 55 - 60. Ford could never get it out totally with replacing & rebalancing tires. This car now has StopTec brakes, MM K-member, MM Coil Arms, MM Coil overs, MM Full lenght subframes, MM Strut tower brace, Diff Brace, all new bushings in the rear, and it still has the vibration. The rear end is off 1/2" on the rear drivers side ... I have to run a 1/2" spacer on that side only! I drive this car at the track and on the street and have never found the problem.
puzzle13 is offline   Reply With Quote
Old 05-22-2009, 09:21 AM   #11
ausie
Don't let the dog drive
 
ausie's Avatar
 
Join Date: Apr 2004
Location: Kinston, NC
Posts: 1,883
Send a message via MSN to ausie
My thoughts: you mentioned that the K-member was moved or damage previously. I would either replace the K-member if you have not done so. Motor mounts may be bent or engine/transmission is out of the center line. Vibration may be due to engine alignment to the drive shaft.
__________________
2004 SVT Cobra, Silver, February 2004
SVT Build # 2485 out of 3768
SLP Loudmouth Cat-back
UPR double lock firewall adjuster
UPR GMS extreme double hook quadrant
Wheels: Ford SVT 10th anniv. wheels (track duty)
SVE 10th anniv. style 17x9F, 10x10.5R
BBS RK Plasma 18x8.5F, 18x10R (retired)


(retired) 2001 black SVT Cobra, October 2001
missed but not forgotten
ausie is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:16 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 1999-2017 SCMC, Inc