I have a 2001 Galant ES 3.0 auto. I'm getting a shudder in the front end on acceleration between 50 and 70mph. Seems like it's worst at 65mph. I replaced the front tires, had it balanced, aligned, and power flushed the transmission. No difference.

Does anybody have any suggestions where to look next?

 

Check to see if it goes away when you apply the brakes, or get worse. Could come down to a drive train issue

 

could be a motor mount, or a bad strut. if not +1 for the comment above.