Electric dipole and electric quadrupole transition data for sodium-like iron, cobalt and nickel have been calculated within the weakest bound electron potential model (WBEPM) theory using experimental energy levels and theoretical expectation values of orbital radii corresponding to those energy levels under the assumption of the LS coupling scheme. The results obtained from this study provide theoretical transition probability and oscillator strength data requested in many fields of researches, especially astrophysics. The calculated transition data results have been compared with available data in the literature. The present results are consistent with earlier calculations. Some new electric quadrupole transition probability values not existing in the data bases, especially for iron have been obtained using this method.