Rotating thud feeling on gas pedal

[Jhayez93]

I have a rotating thud feeling on the gas pedal when going over bumps and WOT accelerating. I've checked for play in both drive shafts. No play at all when in neutral. I can't seem to find the issue. It's only happening over bumps and like I said semi WOT to full WOT. It's a rotating thud feeling. Please help!

 

[Jhayez93]

Forgot to add. It's a 2006 F250 CCLB. It's 4WD as well. This thud feeling is in 2WD. I haven't tested it in 4WD at all.