[en] Quasielastic e-d cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain R_L and R_T at Q²=1.75, 2.50, 3.25, and 4.00 (GeV/c)². The neutron form factors G_En and G_Mn have been extracted using a nonrelativistic model. The sensitivity to deuteron wave function, relativistic corrections, and models of the inelastic background are reported. The results for G_Mn are consistent with the dipole form, while G_En is consistent with zero. Comparisons are made to theoretical models based on vector meson dominance, perturbative QCD, and QCD sum rules, as well as constituent quarks