I have a very subtle vibration that peaks and fades in about 1-second intervals around 80MPH, especially noticeable if I lift slightly off the throttle or set the cruise and the road starts to trend downhill to lighten the load on the drivetrain. Not noticeable in acceleration as much as lighter loads. Not strong enough to shake the shifter except occasionally, mostly in the seat. Wheel balance usually shows up at slower speeds, driveshaft and diff at higher speeds, but this swells and fades, swells and fades in one second "pulses".

Would love ideas on what to check. My thought is driveshaft balance or diff gears.

 

Let me know what you find out. Just got an 08 and I have honestly been trying to figure out if I’m feeling vibrations or if it’s just the road.