I got to thinking (happens once in a while) about how some of you complain about your GT being "jittery" over 70MPH, while others say theirs are fine. I took mine on a 500 mile road trip the week after I picked it up, mostly in the 70-80 MPH range, and 100 to 120 a couple of times. "Sara" was rock steady the whole trip, except for a little wandering in STRONG crosswinds, and always went where she was pointed.

It could be that your toe adjustment isn't right on (nothing else is adjustable). Might be worthwhile for you to have it checked.

My GT was stock at the time. I've since lowered her a little (Eibach Pro Kit), which should help with the crosswinds.

Just a thought.