raymososgarage

hi. this is my first post regarding my 2014 GMC vibrations. purchased in September 2014 with 7 miles . returned to dealer for remote start and vibration at 72-75 mph felt in the seats and console. pretty violent. I was amazed that GM would let a truck like that be delivered. road force balanced tires. vibration still present , but somewhat better. 2ned visit to dealer tires and wheels swapped out with set from another truck. vibration still there. 3rd visit to dealer road forced balanced again. no change 4th visit to dealer driveshaft swapped out with shaft from another truck. vibration much better at 72-75 mph, but vibration felt in steering wheel and floorboard at 50 mph mostly while decelerating . felt like a bad u joint. 5th visit to dealer it was determined that ring and pinion was out of spec. parts were on backorder. 6th visit to dealer ring and pinion were replaced and vibration was 99% eliminated. I still have a minor vibration at 86 to 90 MPH that feels like a tire issue. new oversized tires and wheels are planned for this spring. my truck finally drives as it should.