In a power distribution control system for a four-wheel-drive vehicle, a
4WD controller is electronically connected to a friction clutch for
controlling a torque distribution ratio. The 4WD controller determines
whether a past-history condition, a command torque, and a
reversal-of-torque condition that an input direction of torque inputted
into the friction clutch is reversed is satisfied. The 4WD controller
outputs a countermeasure-of-noise command torque decreased from the
current command torque as a command signal for the friction clutch, when
the past-history condition, the command torque condition, and the
reversal-of-torque condition are all satisfied.