vibration problem

[mcuffe1]

I have a 2000 f-250 7.3 with a dp-tuner f5 chip and gauges. every thing else is completely stock. i noticed the other nite driving in the 80 hp econ mode i accelerated hard from 50 to 75 and i could fell a vibration thru the fuel pedal and floor boards. I tried the same thing in the stock mode and the vibration was gone . any help would be great...

[samiam]

I don't have your answer, but I have felt similar shakes in my truck. I think the range of possibilities goes all the way from tires to tranny to driveshaft. here's a bump up for you. I did notice recently that some of my "shakes" from dead stop went away when i put on new weels and tires. i'm still at basically stock size.

[jbeasts10]

Shuddering/vibration might be the converter/tranny crapping out.With the added power of the tunes.JMO..