Search



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

2005 - 2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.
Sponsored by Latemodel Restoration


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 07-24-2014, 07:56 PM   #1
MuffinSpecial
1st Gear Member
 
Join Date: May 2013
Vehicle: 07 Mustang GT
Location: MA
Posts: 50
Default NEED HELP PLEASE

so my car has started doing a very weird thing. when i accelerate in lets say 3rd gear and let off the gas at around 3500 rpm the rear end sways to the left and when i accelerate it goes to the right. it is way more prevalent wile letting off the gas. i have just installed a set of SR lower control arms a little over a month ago and the issue has started a few days ago. i had a tech were i work and my shop that i go to look at the car and they dont know what the issue is also when you give a sudden punch of throttle you hear a big clunk from the rear on the right side and my mechanic thinks the clunk is the problem but he said everything is nice and tight under the car. when the clunk is hear the issue is more obvious. u have no idea what the issue is and i need help asap the car is not safe drive faster than 80 and thats no fun. its also a very annoying sensation. Car pulls right when you let off and left when you floor it. if anyone has any ideas please help because it is driving my mechanic crazy lol. thanks
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
MuffinSpecial is offline   Reply With Quote
Old 07-24-2014, 08:08 PM   #2
2005Redfire6
6th Gear Member

 
Join Date: Jul 2008
Vehicle: 2005 Mustang
Location: Acworth, GA
Posts: 12,186
Default

Well the panhard bar controls the left/right motion of the axle, I'd be sure that is secure/installed correctly.
__________________
Eddie
Livernois 298 stroker
2005Redfire6 is offline   Reply With Quote
Old 07-24-2014, 11:03 PM   #3
Rudolph Hucker
4th Gear Member
 
Rudolph Hucker's Avatar
 
Join Date: Oct 2012
Vehicle: 2010 4.6 gt with red leather
Location: sweden
Posts: 1,024
Default

will be worn bushes somewhere on the back axel
__________________
Rudolph Hucker is offline   Reply With Quote
Old 07-25-2014, 08:41 AM   #4
MuffinSpecial
1st Gear Member
 
Join Date: May 2013
Vehicle: 07 Mustang GT
Location: MA
Posts: 50
Default

panhard is good they checked that and tightened it it. the clunk is from the back left and that seems to be the cause of the problem. car has 108k on it so something being worn is easily viable. the question is what. it feels like when you accelerate the clunk is something moving backwards into place. and its loud. if its some bushing it seems like it would be totally shot and the mechanic checked everything and said it all looks tight and i couldnt find anything either. we went at the bushings with a crow bar to see if any of them moved and nothing to be found. all i saw was how bad the stock panhard bar is cuz it flexes so easily lol. im thinking of having them take apart some of the left rear end and see what we can find as far as bushings go.
MuffinSpecial is offline   Reply With Quote
Old 07-25-2014, 09:46 AM   #5
bl817
1st Gear Member

 
Join Date: Apr 2010
Vehicle: 2005 Ford Mustang GT
Location: Ft. Worth Tx
Posts: 71
Default

have you checked the upper control arm above the rear diff? its mounted to the top of the pumpkin with a rubber bushing and then mounted to the body with a bracket under the back seat. if that's worn then your pinion angle will change upon acceleration and deceleration. just a thought. lower control arms keep axle from moving fore and aft, panhard bar is left and right, and upper keeps from rolling fore and aft and keeps pinion angle set. mount a gopro cam under the car facing the rear axle and take for a drive and see what happens. don't think a broke spring would cause car to pull to one side or the other.
bl817 is offline   Reply With Quote
Old 07-25-2014, 10:06 AM   #6
Simon1
5th Gear Member

 
Join Date: Dec 2006
Vehicle: 2006 Mustang GT
Location: Redding, CA
Posts: 4,213
Default

I had that happening and it was my differential. But mine was a Detroit locker.

I also had it happen another time and I had broken all my motor mount bolts.

Maybe find a shop with a chassis dyno and put it on with a camera or someone watching it while you accelerate and decelerate.
__________________
[IMG][/IMG]

Motor Built by ST Motorsports
Tuned By Tony at Tuners Inc

11.05@129
Simon1 is offline   Reply With Quote
Old 07-25-2014, 10:07 AM   #7
MuffinSpecial
1st Gear Member
 
Join Date: May 2013
Vehicle: 07 Mustang GT
Location: MA
Posts: 50
Default

i was going to try the gopro after work tonight to see if i can see it. im gunna have it look at the left half of the suspension and then the control arm to see if anything is prevalent. if not then im bringing it to the shop to have them start tearing down some pieces
MuffinSpecial is offline   Reply With Quote
Old 07-25-2014, 12:17 PM   #8
MuffinSpecial
1st Gear Member
 
Join Date: May 2013
Vehicle: 07 Mustang GT
Location: MA
Posts: 50
Default

im ditching this car for a 15 when it comes out so spending a lot of money on it is not really in my agenda. im gunna go with the gopro after work and see if i can see it. mentioned to my mechanic the diff but we dont think its that. the upper control arm is something that sounds viable but also the clunk sounds like its on the left of the rear end so im confused as of now until i get an eye under there.
MuffinSpecial is offline   Reply With Quote
Old 07-26-2014, 06:25 AM   #9
LordRipberger
3rd Gear Member

 
LordRipberger's Avatar
 
Join Date: Aug 2009
Vehicle: 2006 V6 Mustang
Location: Purdue University Alum in MD
Posts: 515
Default

What about the brakes? Is is possible you pitched a line or cause some damage while working under there that the right side is constantly braking and is being overpowered when accelerating? So only when power is not being given to the wheels, it is actually braking.

I would imagine though you would smell something so this is probably not it, just thinking out loud.
LordRipberger is offline   Reply With Quote
Old 07-26-2014, 07:32 AM   #10
MuffinSpecial
1st Gear Member
 
Join Date: May 2013
Vehicle: 07 Mustang GT
Location: MA
Posts: 50
Default

i dont think it is the brake. what ever the clunk is is the issue. the car only pulls like that when you hear the clunk when you accelerate. you have to accelerate hard enough to hear the clunk and then when you let off what ever the clunk is must move back cuz then the rear shakes then lines back up and only shake initially when you let off then its fine. but when you accelerate you can tell after the clunk that the car is pulling slightly to the left. so its moving the alignment of the axle possibly. this is seriously confusing lol
MuffinSpecial is offline   Reply With Quote
Old 07-26-2014, 07:32 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
suspension, sway

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 01:41 PM.

© Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, 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. Ford® is a registered trademark of the Ford Motor Company
Emails Backup