hey man on the 03-05 trucks there is a module that sits under the battery tray that houses the DBW stuff then you can keep the stock peddle. As a cable comes off it to the module and that controls the TB.
Actually only '03 and '04 Rams had this module. The accelerator sensor was part of this module with was actuated by the gas pedal/cable setup. In '05 they went to a pedal with the accelerator sensor built in so you wouldn't need to have this added component, basically getting rid of the middleman in the throttle system. This is why I went with the '05 PCM.