NHTSA Complaint #11025337 — 2015 CHEVROLET TAHOE

I HAVE HAD THIS VEHICLE SINCE JUNE 2015 AND HAD THE TAHOE WITH AUTONATION CHEVY ON SEVERAL OCCASSIONS. AT ONE POINT IT WAS THERE FOR ALMOST 3 MONTHS. THE FRONT OF THE VEHICLE SHAKES AT 77 MPH ON THE HIGHWAY. THE ENTIRE FRONT END SHAKES. THEY HAVE CHANGED THE MOTOR MOUNTS, REAR TIRES AND THEY HAVE ALIGNED VEHICLE. THEY HAVE FOUND NOTHING. THEY OFFERED TO DO A BUY BACK BUT OF COURSE WITH A LOSS TO ME AND I FEEL THIS IS NOT MY PROBLEM. I DID NOT BUILD THE VEHICLE. NOW AFTER TO SPEAKING TO THE NEW SERVICE MANAGER AT MY DEALERSHIP THEY SAY THERE IS AN ENGINEERING DEFECT. PLEASE FIX IT IS ALL I ASK OF CHEVY. CAN YOU PLEASE HELP???