The distribution of the translational energy in the forward direction has been measured for the ions resulting from the reactions CH3OH++D2 → CH3OHD++D CH3OH++CD4 → CH3OHD++CD3 at various relative kinetic energies. At high energies, spectator stripping was observed. At low energies, intermediate complexes which isotropically decay are formed. The reaction with D2 has a threshold of about 0.2 eV in the CM system. The complex that is formed at energies slightly above the threshold decays without kinetic energy of the products. At high energies, exploding complexes are formed until stripping mainly determines the collision mechanism. A simple model for D-atom transfer is proposed in which both the collision time and the resonance for energy transfer from the critical degree of freedom of the transition species into the other internal degrees of freedom are regarded. The relaxation time for the energy distribution among the degrees of freedom is estimated from the observed stripping → complex transition energies. Values of some 10-14 sec were obtained,which shows that internal energy relaxation in polyatomic species is a very fast process.