Smithwicks

Background on the car:

Last time I took it up to highway speeds (70-80) was the first weekend in January and there were no issues, since then I've changed the rear rotors, pads, and ebrakes two weekends ago, no problems after it.

Last weekend I changed out the entire suspension and havent had any problems driving it this week even at speeds up to 50mph. Suspension is Koni FSD's with H&R's along with all new mounts.

This past Wednesday I quick took it by an alignment shop and had them check to see if anything was off because the car was pulling to the right slightly. The tech hooked it up and said the only thing out of norm was the left toe, but didnt have him perform the alignment. Later that night rotated the tires, moving the fronts straight back and crisscrossing the rears to the front.

Took a vacation out to Arizona starting this morning and immediately getting on the highway at speeds above 60mph both the front and rear started having issues. On concrete the front and rear seemed relatively similar in their severity but once I got onto asphalt the severity would switch from the front to the rear and then back again. So as you go down the road your seat would begin to shake worse, then die off and at the same time the steering wheel would shake more. This cycle kept repeating the entire way out here.

Currently taking it to a Big O and having them look at the tire balancing just to see if it could be something simple.

Anyone have any ideas besides getting the alignment actually done and seeing if that helps? Or from the symptoms does the fault lie with a hub, wheel, or tire...

Thanks guys.