Why does your ford expedition makes a shudder sound while driving?
Could be lots of causes, but most likely either rear
differential issue or torque converter shudder in automatic
transmission, though Ford is not nearly as common to have
transmission shudder as a Chrysler is. Mine was the rear
differential. (98, 5.4l). Mine was most pronounced when
accelerating around a corner. Transmission shudder would most
likely show up on acceleration at any time.