I have noticed in the last few weeks my truck vibrates when slowing down (when I let off the gas when approaching a stop sign). It's not like the kind of vibration where you are bouncing around, but I can feel it on the peddle. It's really never done this before a couple weeks ago. I usually have my music loud, so just now I turned it down and could hear a noise kind of like a phone vibrating on a hard surface. It drives perfect otherwise, but this is just sketchy and annoying. Any ideas on what this could be would be very helpful. I just had the hubs replaced, tires are new and fine.
Thanks.

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2008 F-150 Supercrew Lariat 4x4, 5.4L.
2007 Ranger Supercab FX4, 4.0L, Accident mod done in December, 2012, totalled.
1998 Ranger Reg. Cab, 3.Slow. Sold, then totalled.