Abstract The measured B-meson semi-leptonic branching ratios R _D and $ {R}_{D^{*}} $ R D * have long-standing deviations between theory and experiment. We introduce a model which explains both anomalies through a single interaction by introducing a right-handed neutrino as the missing energy particle. This interaction is mediated by a heavy charged vector boson (W ^′) which couples only to right-handed quarks and leptons of the Standard Model through the mixing of these particles with new vector-like fermions. Previous W ^′ models for the $ {R}_{D^{\left(*\right)}} $ R D * anomaly were strongly constrained from flavor changing neutral currents and direct collider searches for Z ^′ → τ τ resonances. We show that relying on right-handed fermion mixing enables us to avoid these constraints, as well as other severe bounds from electroweak precision tests and neutrino mixing.