Bad vibration on 1989 Mustang GT

Mistertribal · April 23rd, 2009, 05:00 AM

I noticed that I have a bad vibration on my car especially when I decelerate from approx from 80 to 65 mp/h and it feels like I was driving on the "rugged" band on the side of the road which is not the case...I don't feel this vibration on lower speed like 60 mp/h and less in lower gears though...I have new tires, freshly balanced and aligment just done...Any ideas of what could cause that problem??

89lx · April 23rd, 2009, 06:02 AM

did you check your u joints? did you have the vibration before the new tires?

hopper · April 23rd, 2009, 08:09 AM

usually the problem at that speed is either the wheel bearings or you shifted a belt inthe tires.

1slo5.0 · April 23rd, 2009, 10:22 AM

When did the problem start? Possible causes are tires, u-joints, driveshaft out of balance........just like the other guys mentioned.

grnstang · April 23rd, 2009, 11:18 AM

i have a vibration in my shifter and clutch pedal at high speeds...: ( it bugs the heck out of me

1slo5.0 · April 23rd, 2009, 01:59 PM

Originally Posted by grnstang

i have a vibration in my shifter and clutch pedal at high speeds...: ( it bugs the heck out of me

Transmission bearings.

dr.gonzo! · April 23rd, 2009, 02:04 PM

Originally Posted by Mistertribal

I noticed that I have a bad vibration on my car especially when I decelerate from approx from 80 to 65 mp/h and it feels like I was driving on the "rugged" band on the side of the road which is not the case...I don't feel this vibration on lower speed like 60 mp/h and less in lower gears though...I have new tires, freshly balanced and aligment just done...Any ideas of what could cause that problem??

Do you have 3.73 or 4.10's ?

Mistertribal · April 23rd, 2009, 02:28 PM

Originally Posted by 89lx

did you check your u joints? did you have the vibration before the new tires?

No I haven't check my U joint, it is the one that came with the drive shaft with my T-5 conversion kit and I have no idea how old it is...

Originally Posted by Darrell

When did the problem start? Possible causes are tires, u-joints, driveshaft out of balance........just like the other guys mentioned.

I think the problem started after the new tires and/or after I had the car aligned...

Originally Posted by grnstang

i have a vibration in my shifter and clutch pedal at high speeds...: ( it bugs the heck out of me

I feel this vibration in the shifter also especially in 5th gear...

Originally Posted by dr.gonzo

Do you have 3.73 or 4.10's ?

I have 2.73...

Traidmarx · April 23rd, 2009, 02:32 PM

i'd def. check the u joints mine would vibrate horrible at any speed above 40 mph and around 80 mph it would shake the shit outta the car. put new joints in and it rides like a new car.

Mistertribal · April 23rd, 2009, 02:35 PM

Originally Posted by Traidmarx

i'd def. check the u joints mine would vibrate horrible at any speed above 40 mph and around 80 mph it would shake the shit outta the car. put new joints in and it rides like a new car.

Should I change the U joints first and if it doesn't solve the problem then change the drive shaft??

Traidmarx · April 23rd, 2009, 02:36 PM

well you can have the driveshaft checked to make sure its balanced....like someone asked before do you have gears??? see if you can get under the car and see if the drive shaft has alot of play in it...if it does then its the U joints.

Mistertribal · April 23rd, 2009, 02:45 PM

Originally Posted by Traidmarx

well you can have the driveshaft checked to make sure its balanced....like someone asked before do you have gears??? see if you can get under the car and see if the drive shaft has alot of play in it...if it does then its the U joints.

Ok I'll go check it out and as I said in a previous post, I still have the original 2.73 gears...

Traidmarx · April 23rd, 2009, 02:52 PM

i missed that my bad..

Mistertribal · April 23rd, 2009, 02:55 PM

Originally Posted by Traidmarx

i missed that my bad..

No prob..!!

1slo5.0 · April 23rd, 2009, 04:46 PM

Originally Posted by Mistertribal

No I haven't check my U joint, it is the one that came with the drive shaft with my T-5 conversion kit and I have no idea how old it is...

I think the problem started after the new tires and/or after I had the car aligned...

I feel this vibration in the shifter also especially in 5th gear...

I have 2.73...

The first thing to do is make sure all of the lug nuts are tight. If they are all tight and the problem started after the new wheels and tires then take it back to the shop that did the work and tell them the problem you are having and that they need to fix it.

Mistertribal · April 23rd, 2009, 06:52 PM

I will for sure.

C MY 4D · April 23rd, 2009, 06:58 PM

I would also check the driveshaft bolts. They tend to back out if you don't tighten them enough.

grnstang · April 23rd, 2009, 07:22 PM

Originally Posted by Darrell

Transmission bearings.

is there any other way of telling if my bearings are bad?

Mistertribal · April 23rd, 2009, 07:28 PM

Thanks bro...I'll have a look at it also since we had to remove it to change the imput shaft seal recently...The bolts might not be tight enough...that makes a lot of sense...Thanks again...

Mistertribal · April 23rd, 2009, 07:53 PM

Thanks bro...I'll have a look at it also since we had to remove it to change the imput shaft seal recently...The bolts might not be tight enough...that makes a lot of sense...Thanks again...

April 23rd, 2009, 05:00 AM	#1
Mistertribal Regular 1989 Mustang GT vert. Join Date: Aug 2007 Location: Québec, Canada Posts: 246 iTrader: 0 reviews	Bad vibration on 1989 Mustang GT I noticed that I have a bad vibration on my car especially when I decelerate from approx from 80 to 65 mp/h and it feels like I was driving on the "rugged" band on the side of the road which is not the case...I don't feel this vibration on lower speed like 60 mp/h and less in lower gears though...I have new tires, freshly balanced and aligment just done...Any ideas of what could cause that problem?? __________________ Keep pursuing your dreams...'cause when you stop...you die. 1989 Mustang GT convertible Dynomax Ultra Flo 2.5" catback, BBK 2.5" O/R H Pipe.

April 23rd, 2009, 06:02 AM	#2
89lx Regular 1989 LX coupe 5.0L Join Date: Dec 2007 Location: NS Canada Posts: 496 iTrader: 0 reviews	did you check your u joints? did you have the vibration before the new tires? __________________

April 23rd, 2009, 10:22 AM	#4
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	When did the problem start? Possible causes are tires, u-joints, driveshaft out of balance........just like the other guys mentioned. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

April 23rd, 2009, 11:18 AM	#5
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	i have a vibration in my shifter and clutch pedal at high speeds...: ( it bugs the heck out of me __________________

April 23rd, 2009, 02:32 PM	#9
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	i'd def. check the u joints mine would vibrate horrible at any speed above 40 mph and around 80 mph it would shake the shit outta the car. put new joints in and it rides like a new car. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

April 23rd, 2009, 08:09 AM	#3
hopper Regular Join Date: Apr 2007 Posts: 390 iTrader: 0 reviews	usually the problem at that speed is either the wheel bearings or you shifted a belt inthe tires.

April 23rd, 2009, 02:36 PM	#11
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	well you can have the driveshaft checked to make sure its balanced....like someone asked before do you have gears??? see if you can get under the car and see if the drive shaft has alot of play in it...if it does then its the U joints. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

April 23rd, 2009, 02:52 PM	#13
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	i missed that my bad.. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

April 23rd, 2009, 06:52 PM	#16
Mistertribal Regular 1989 Mustang GT vert. Join Date: Aug 2007 Location: Québec, Canada Posts: 246 iTrader: 0 reviews	I will for sure. __________________ Keep pursuing your dreams...'cause when you stop...you die. 1989 Mustang GT convertible Dynomax Ultra Flo 2.5" catback, BBK 2.5" O/R H Pipe.

April 23rd, 2009, 06:58 PM	#17
C MY 4D Billy Weston 2003 Cobra 11.14@124.36 Join Date: Aug 2006 Location: Hampton, VA Posts: 4,806 iTrader: 8 reviews	I would also check the driveshaft bolts. They tend to back out if you don't tighten them enough. __________________ TT Build in progress....... Need work done to your car for a great price in Hampton Roads? Shoot me a PM.

April 23rd, 2009, 07:28 PM	#19
Mistertribal Regular 1989 Mustang GT vert. Join Date: Aug 2007 Location: Québec, Canada Posts: 246 iTrader: 0 reviews	Thanks bro...I'll have a look at it also since we had to remove it to change the imput shaft seal recently...The bolts might not be tight enough...that makes a lot of sense...Thanks again... __________________ Keep pursuing your dreams...'cause when you stop...you die. 1989 Mustang GT convertible Dynomax Ultra Flo 2.5" catback, BBK 2.5" O/R H Pipe.

April 23rd, 2009, 07:53 PM	#20
Mistertribal Regular 1989 Mustang GT vert. Join Date: Aug 2007 Location: Québec, Canada Posts: 246 iTrader: 0 reviews	Thanks bro...I'll have a look at it also since we had to remove it to change the imput shaft seal recently...The bolts might not be tight enough...that makes a lot of sense...Thanks again... __________________ Keep pursuing your dreams...'cause when you stop...you die. 1989 Mustang GT convertible Dynomax Ultra Flo 2.5" catback, BBK 2.5" O/R H Pipe.

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