Uh Oh, Random Vibration At Stop Light

I got an 07 4x4 DC auto. Bought it used with 36K. Now have a little over 42K a year later...

Anyways, I havent had any problems with it, except for the squeaky blower fan.

The other day, while stopped at a red light, my truck shook for about 3 secs. Not like jumping on hydros, but a vibration that made me go wtf. I thought maybe I got rear ended. It was very strange. Almost like someone had a super loud exhaust or something, but that wasnt the case.

My truck is stock for the most part.

Anyone else have phantom vibrations??

 

I had vibrations(felt like rumble strips) when pulling up and away from lights/stops. They came and went. From about 5mph-15mph. I had a bad ujoint close to the tranny. Changed all 3 and smooth now.