Strange VIbration

[Patton]

So my problem isn't bad and it's not effecting performance but I would like to take care of it before it gets worse.
While going up small hills with a slight amount of acceleration a strange vibration reverberates throughout the cab, though I mainly feel it in the acceleration pedal. It's not a awfully bad vibration but as most of you can relate, I know the movements and sounds of my car and this vibration is not supposed to be there. It doesn't happen enough for me to narrow it down much further for you guys but I was hoping for a few ideas. I understand fully if this isn't enough information to come to any helpful conclusion.
Thanks

 

[Patton]

After a few more days of driving I think I've narrowed it down a bit further. The vibration occurs pretty consistently at 1400 RPMs. Hope this helps.

 

[steventadams]

u-joints maybe? From what I understand those start to vibrate and clank a little when they start going bad... Someone else will chime in I'm sure though...