at 70 m.p.h it vibrates bad at times and not so much others . what i dont get is it only does it cruisin if im on it no vibration . every now and again in 3rd it will also . i just put a new poly trans mnt in it will this cause vibrations that the stock rubber might have hid . i have balanced all tires and so on , new u -joints , balanced shaft " steel", im lost on it

 

Hide the Vibe with a 94-97 Firebird NAPA Trans mount for $16.49 or spend tones of dough to try chase the problem.

 

I got the same thing going on in my 96, right about 70 too