Hi everyone, I have a 2002 F250 with the 5.4 Triton engine. 184k miles, automatic transmission with 2wd. No check engine light is currently on. My truck shakes very badly between 35-60 MPH, and i'm trying to figure out why. It doesn't instantly shake when I reach 35, only when I let off the gas and get to lower rpm's does it begin shaking. If I turn off overdrive it usually doesn't shake any more, but that results in terrible gas mileage. What do you guys think could be causing this? I changed the plugs and coil packs a little over a month ago so I don't think its that. Any help is appreciated.