  The dynamical model of pion electroproduction has been extended to
investigate the weak pion production reactions. The predicted cross sections of
neutrino-induced pion production reactions are in good agreement with the
existing data. We show that the renormalized(dressed) axial N-$\Delta$ form
factor contains large dynamical pion cloud effects and this renormalization
effects are crucial in getting agreement with the data. We conclude that the
N-$\Delta$ transitions predicted by the constituent quark model are consistent
with the existing neutrino induced pion production data in the $\Delta$ region.
