Go Back   MustangForums.com > Ford Mustang Tech > 2005 - 2014 Mustangs > GT S197 General Discussion
Sign in using an external account
Register Forgot Password?
Search


GT S197 General Discussion This section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-03-2011, 09:16 PM   #11
steeda059
 
Join Date: Jan 2010
Vehicle: 2009 GT/CS
Location: AZ
Posts: 8
Default

I replaced my LCA's with 7,500 miles on them and they were already starting to crack
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
steeda059 is offline   Reply With Quote
Old 03-04-2011, 06:05 PM   #12
tdbrown75
2nd Gear Member
 
Join Date: Sep 2006
Location:
Posts: 361
Send a message via Yahoo to tdbrown75
Default

Spoke to the shop foreman this morning and discussed the situation with the car. He’s going to have it back on the EVA (electronic vibration analyzer) to reassess the vibration now that the rear axle has been changed out and the gear noise is gone. We discussed everything that’s been done to this point, talked about the mods, pinion angle and possibility of an unbalanced drive shaft.

His next steps will be to re-index the driveshaft, if that’s ineffective he will weight it with clamps to see if he can identify an imbalance. He felt confident he could narrow it down and even suggested we was going to try a few different pinion angles himself to completely rule that out as well. I even mentioned returning the car to stock ride height and he said it would not be necessary.

I didn’t feel I needed to sit there and make any demands about changing driveshaft’s or anything else, I like the approach he is taking and through the process of elimination this will eventually get narrowed down and eliminated. I consider myself very fortunate to have access to a dealer like this; I can’t even imagine the cost of trying to figure this out on your own.


Tim
tdbrown75 is offline   Reply With Quote
Old 03-04-2011, 11:10 PM   #13
tx_zstang
5th Gear Member
 
tx_zstang's Avatar
 
Join Date: May 2007
Vehicle: 2006 Turbo V6; 2005 V6->V8 swap beast
Location: Central Texas
Posts: 2,336
Default

Sounds like you're getting well taken care of. See what they find, give them a chance.
Let us know what they find. Good luck!
__________________
Mike - 2005 Stroked/Forged/Cammed V8 (5.0L.); twin-turbo build underway
- 2006 4.0 V6 with PH Turbo and TR6060
tx_zstang is offline   Reply With Quote
Old 03-06-2011, 08:50 AM   #14
kpd1031
 
Join Date: Mar 2009
Vehicle: 2008 mustang GT
Location: NY
Posts: 13
Default

I had the same exact problem after my dealer installed my 410's. My dealer is also very good and took all the same steps yours is taking, even replacing the driveshaft. Nothing worked. In fact after every trip to the dealer, the vibration would move to a different speed, say from 45 mph to 65 mph, it was very frustrating. Finally I decided to take matters into my own hands and I dropped the rear of the shaft, rotated it 180 degrees and made sure I tightened the flange bolts in a star pattern very slowly to the proper torque spec with red locktite. Vibration gone! Bottom line is I don't think the orientation of the shaft is as important as properly tightening the flange bolts. Its a very snug fit between the pinion flange and the shaft and the shaft must be seated properly. Its a real PIA dropping a shaft in your driveway while laying on your back, but trust me it was worth the trouble. After four trips to the dealer with no solution, I was just about ready to get rid of the car. Car is absolutely vibration free now.
kpd1031 is offline   Reply With Quote
Old 03-08-2011, 11:05 PM   #15
1LAP2GO
 
Join Date: Jan 2011
Vehicle: 2010 Grabber Blue GT Vert
Location: West Virginia
Posts: 1
Default

I agree with SteedaGus. "Your problem is most likely driveshaft balance." I had an 06 GT Vert with a highway vibration. I thought it would go away when I replaced the BFG's at 48k - Nope. I thought it would go away with road force balancing - partially. I thought it would go away when I had a slight bend in one of the wheels straightened - helped a little more. Finally went completely away when I cleaned all of the aftermarket undercoating overspray off of the drive shaft. The company/tech that applied the undercoating, coated one side (the bottom side) of the drive shaft the whole length of the both sections. You wouldn't think so, but the undercoating acted like a balancing weight the whole length, especially as gravity drew it to the very bottom of the shaft as it dried. A little WD 40, a rag and presto - vibration was completely gone.
1LAP2GO is offline   Reply With Quote
Old 03-08-2011, 11:42 PM   #16
tdbrown75
2nd Gear Member
 
Join Date: Sep 2006
Location:
Posts: 361
Send a message via Yahoo to tdbrown75
Default

Thanks for all the feedback guys! Car is at the body shop now getting some paint work done, after that it's right back to the shop for the vibration issue. With a little luck I'll have her back sometime late next week all purtied up and vibration free. I'll be sure and post an update when I get some new information, but I'm really hoping the third times a charm in this case.

Tim
tdbrown75 is offline   Reply With Quote
Old 03-08-2011, 11:57 PM   #17
kpd1031
 
Join Date: Mar 2009
Vehicle: 2008 mustang GT
Location: NY
Posts: 13
Default

No vibration before the 410's. Vibration after the 410's. Same drive shaft= same balance. The only thing that may have changed is the orientation of the shaft or the way it was reinstalled. Shaft is good, trust me on this one. Some may argue that since the shaft is spinning faster with the 410's that it will vibrate more. Before my 410's I did 130mph with stock gears and stock shaft with no vibration at all. After 410's vibration at 60mph. The dealer simply did not take the time to properly torque the flange bolts. Do it properly, and you will be happy.
kpd1031 is offline   Reply With Quote
Old 03-21-2011, 11:40 PM   #18
tdbrown75
2nd Gear Member
 
Join Date: Sep 2006
Location:
Posts: 361
Send a message via Yahoo to tdbrown75
Default

After another week in the shop the dealer has reached the end of the line. And after 20 minutes on the phone with the Service Advisor Iím pretty sure Iím just going to give up too. In a nutshell after another attempt with inconclusive EVA readings the dealer ended up having to contact the Ford Hotline, who basically told them the 4.10 gears are the cause of the harmonic vibration. They provided some supporting technical detail, most notably NVH data Ford has specific to the gear set that almost exactly matches the EVA readings they took on my car. They have a file with the readings and information for me to review when I go pick it up, but I also plan to talk to the Foreman tomorrow to understand exactly what they did with it (tests, procedures) and to ask him why he thinks the EVA rules out DS balance, etc.

I know I know, Iíve seen the ďI have 4.10s and no vibrations at allĒ threads too. But hereís where it gets really interesting. I got a ride from my buddy last Friday over to the dealer. Heís got a 06 GT with 4.10s and guess what? HIS DOES IT TOO! The exact same humming, harmonic vibration only his was masked by his FRPP stingers, some gear whine and suspension rattles. He does not feel he has a harmonic vibration, I suppose itís all relative to the other noises the car makes and ones ďsensitivityĒ to such things. I know a few other Mustang club members with 4.10s and you can bet Iím going to be taking some rides this summer to test the theory.

I suppose I could try a replacement DS next, or perhaps 3.73s (which would force me to mess with my tune for months on end again), perhaps change the pinion angle, or ride height, or a dozen other variables which could be the cause if itís not in fact the gears after all as the Ford Engineering hotline claims (what the heck would Ford know about it anyway). In fact thereís probably no end to the things to try, replacement parts, money and time to invest trying to figure something out that I only ever occasionally experience and doesnít seem to have any negative impact on performance anyway. I think the fix in this case is to quit hyper analyzing every little noise the car makes, crank the radio up and enjoy the hell out of the thing. If something breaks I can always fix it down the line.

Tim
tdbrown75 is offline   Reply With Quote
Old 03-22-2011, 10:56 AM   #19
tdbrown75
2nd Gear Member
 
Join Date: Sep 2006
Location:
Posts: 361
Send a message via Yahoo to tdbrown75
Default

Quote:
Originally Posted by kpd1031 View Post
No vibration before the 410's. Vibration after the 410's. Same drive shaft= same balance. The only thing that may have changed is the orientation of the shaft or the way it was reinstalled. Shaft is good, trust me on this one. Some may argue that since the shaft is spinning faster with the 410's that it will vibrate more. Before my 410's I did 130mph with stock gears and stock shaft with no vibration at all. After 410's vibration at 60mph. The dealer simply did not take the time to properly torque the flange bolts. Do it properly, and you will be happy.
I will try this as a last resort, it worked for you maybe it will work for me. The only thing that makes me feel it's something other than a balance issue is the fact that it gets worse after the car warms up completely, if a balance issue wouldn't it be same all the time? Also it's definatley sensitive to throttle input which would also lead away from a balance issue I would think. It's got stock fluid in it right now and I plan on changing to RP after the break-in, not sure if that will make any difference or not.

Tim
tdbrown75 is offline   Reply With Quote
Old 03-22-2011, 11:07 AM   #20
ShaneM
5th Gear Member
 
ShaneM's Avatar
 
Join Date: Jun 2009
Vehicle: 2012 CO Boss 302 #0333
Location: Texas
Posts: 2,397
Default

you have the pinon angle checked? i was contemplating an aluminum DS and all said that it needed to be precisely at OEM settings (which i forget now) or you get vibration at speed. perhaps the angle is off leading to the vibration. i once had a bad u joint on a 87 lx 5.0 that vibrated at one specific speed and nowhere else.
__________________
2012 Boss 302 Competition Orange with Recaros #0333

ShaneM is offline   Reply With Quote
Old 03-22-2011, 11:07 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
2000, 2006, acceleration, chatter, drive, driveline, ford, frequency, highway, low, mustang, shaft, speed, v6, vibration

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 06:03 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Fordģ is a registered trademark of the Ford Motor Company
Emails Backup