[BCompy]

H, As a prior Shakeaholic I would like to offer this advice when dealing with this problem. Make notes and a checklist of what you have done to date.In diagnosing my problem I had a tendency to be redundant and trying the same fix over again. What I believed to be an out of balance tire causing a front end shake turned out to be an out of balance driveshaft causing the whole car to shake. I did feel it in high speed turns.It did come and go between sixty and seventy with no rhyme or reason. I had the front end checked and rechecked, aligned, complete new set of tires and replaced the rear axles without curing the problem. I finally just pulled the driveshaft for grins and two hours later had the car smooth as glass. I still grit my teeth at seventy waiting for that dam shake to come in.But it is like driving a new car.
Good Luck I hope it is not the pain in the ass mine was!