Vibration during Idling

Hey all still pretty new around here. I’m about to go on a long road trip from Seattle to LA and I just started hearing a vibration right in the middle backseat floor. Happens only when in drive going below 10mph and when in reverse. Truck is only at 21k right now and help would be appreciated.

 

Did you forget to lube the unies?

 

I’ve checked I’ve got no clunking. Also sadly don’t what how and what to lube the universal. I am bringing it in tomorrow morning to the dealership hopefully they can fix whatever is wrong since I leave the day after for my trip.

 

Yes I am

 

It’s 5TFCZ

 

The vibration usually stops after I hit 20 mph but definitely more noticeable fully stopped but still happens at low speeds. Thanks for looking it up. What’s the TSB number for the vibrations for the seat and floorboard? I don’t get any vibrations when breaking gladly.

 

Alright so I went to the dealership and had them look into it and they figured out after a few hours and apparently it was the vehicle jack causing it all. We’ll see how it goes on this trip.