well heres the deal. my car runs great and i love it and take very good care of it. its a 92 camaro. my only problem is the freakin thig will not stop vibrating. when ever i go about 70 or over the dash vibrates as well as my foot on the gas. when i stick it in over drive it does it to but a little more steadily.

 

my sister had a MR2 that did that,, all it was was some front end work and a frontend allignment.

 

Start with tire balance, then check the suspension. U-joints should be checked, and rear tranny mount (sagging or broken). Steel driveshafts have been known to be unbalanced or bent, have it checked if all else checks out.

This is assuming the shaking is related to vehicle speed, not engine speed. Mine was the latter; when I changed the torque converter, it smoothed out wonderfully. My dash pads sits still now.