Nasty highway vibration, need help bad

[spockmeat]

I have a 1995 Eagle Talon TSI AWD, and for some reason, after about 65mph on the highway, a vibration coming from the back wheels makes the whole back of the car vibrate. i cant tell exactly where its coming from, i just know its in the rear. when i press the gas pedal, it gets worse, when i release pedal completely, it doesnt COMPLETELY go away, but it does reduce some. i tried the same speeds in 4th gear instead of 5th and the same thing happend. BTW tire balance is good.

 

[4BangR-x]

Why do you think your wheel balance is good? Did you get them balanced when you were experiencing this problem?

Maybe try an alignment, are your tires scalloped at all?

 

[spockmeat]

i had the tires balanced before i went to work today, didnt help at all. mabey allighnment, anyone else have any suggestions?

 

[4BangR-x]

are your tires scalloped at all?

Answer this question for further help please

 

[Defiant]

A blown shock will cause that, as can a bad universal joint in the driveshaft.