Every time I lightly press on the gas peddle feel like a thud feeling. It's hard to pin point exactly were its coming from but I think it's from the tranny. It also has the same feel when I stop. I also feel a slight vibration when accelerating to about 55 mph. The truck is an 06 5.4 scab 2wd. Any help will be appreciated.

 

slip yoke?

 

If its slipping put some Lucas in

 

transmission mount mabey?

 

There is a basketball rolling around in the back of your truck.