Vibration at 80 MP/H??

[JS Saia]

I've now changed the shocks and tires, and I still have a vibration which starts at 78 MP/H and deminishes after 90 MP/H. I know the ST is a truck, but this is our highway cruising speed up here and it gets annoying. What should I check next ?? Or is this a normal ST thing?? I was certain that it was due to my slightly "warped" winter tires but I guess I was wrong. Any ideas ?:unsure:

 

[Aaron Yarbough]

My suggestion would be to have the tires rebalanced and check the front end for worn parts(ball joints, tie rod ends, drag link, wheel bearings, etc.).

 

[2]

Check your alignment. If not that it could be your driveshaft that needs to be balanced. Mine would start to vibrate a little at 80km/hr and get worse the faster I went. At about 120km/hr it would feel like I was going to vibrate right off the road. Once the driveshaft was replaced it was as smooth as glass.

 

[Jorgie Hidalgo]

i get vibrating too. i got a high speed balancing done and it went away a little bit. and i also get that noise when i hit 85 from the back like a howling sound

 

[Brian Wolf]

Mine used to vibrate around 75, but it went away when I got new tires, and an alignment. so was probably a balancing thing. She makes it to 100 smoothly. ( No I don't do that often )

 

[Jeffksf B]

I had a high speed vibration that went away with new lower balljoints, they were pretty sloppy. I have 80K miles on mine. You might want to check yours.

 

[Charles Faile]

when I put wheel spacers on I got a slight vibration at 60-63 then goes away.

 

[David Mazur]

I also thought there was a problem with some of the driveshafts. You might want to check and see if there is a TSB for that..

 

[EddieS'04]

There is a problem with some of the steel driveshafts balance. The replacement is alluminum..

 

[Benjamin Feinstein]

And we are driving our Sport Tracs that fast why? I thought the tires were only speed rated to 80mph.

 

[user 62394]

I had to replace ball joinst to fix this.



Rocks

 

[Yardsale]

Check the vibration chart in my library.

 

[Gavin Allan]

Driveshaft TSB (free replacement) on '03 and prior fixed this on a bunch of them.

 

[2]

Driveshaft TSB (free replacement) on '03 and prior fixed this on a bunch of them.

Only if you are under warranty. If you are not it is cheaper to go to a driveshaft place that will balance it for you.

 

[Jason Sundown]

I have the same problem since I bought mine used. It vibrates with the stock tires. Then I bought 20" wheels /balanced and it still would vibrate at speeds over 60mph and when i hit bumps at that speed it shook a little more. My tire pressure is even. I feel like one day it will loosen my bolts so I check the tightness every week but they are fine. I guess it can be many things but I don't want to start guessing and changing this and that. I don't have the money to guess. Me and my girl consider it a free vibrating seat massage at this speed. hahaha, but yeah its annoying sometimes seeing my leg shaking and im not doing it. hahahah

 

[Chris Kulbaba]

The free replacement TSB, does the person have to be the original owner?

 

[Richard L]

Vbration at speeds in excess of 70 MPH are NOT wheel balancing or alignment problems. They are caused by the driveshaft being out of balance. This was fairly common problem on many early model year Sport Tracs.



Ford was replacing the standard steel tube driveshafts with new aluminum units.



If the vibration is at or below normal highways speeds (up to 70 MPH) then it will most likely be a wheel balance issue, or perhaps a devctive or out of round tire, or a bent wheel.



...Rich

 

[2]

XST- read my post under that, ONLY IF YOU ARE UNDER WARRANTY is it free. TSB is a Technical Service Bulletin, it is only to tell a service tech how to fix common problems/issues. It is not a recall or warranty. Nothing free about it.