WHEN I DRIVE 40 TO 80 IN SPEED THE JEEP SHAKES ???

What is your question?

When i get up to speed to 40/80 the jeep start to shake on me to get it to stop i need to slow down again/

What makes this problem better or worse?

nothing so far i have tried everything so far

How long has your 2010 Jeep Grand Cherokee had this problem?

8 months now