Steering wheel is front tires, seat or feet is rear tires.Where do you feel the vibration, in your steering wheel or your seat?
Rotate the tires front to back and did the vibration move?Well, they confirmed my rear wheels were out of balance and road force balanced all four. Unfortunately, it still has the vibration. They said it can take 800-1200 miles for flat spot on tires to work themselves out. I didn't have this issue whatsoever with my 2008.
I also keep feeling the driveline slack with the auto. When you come to a stop and the move on you can feel the engine rev slightly before the the rear catches up. I think I'm just oversensitive....
I'm on my fourth Frontier and own a Pathfinder and every one drove great. Now ask you dealer why my 5 trucks are abnormal?I have a 2009 and I notice the same problem. Took it to the dealer 3 times, had the tires balanced, front end aligned, but still had a moderate viration starting around 65 mph. The dealer finally gave up and said it was "normal" for trucks.