  The observed sign of a deviation from the $e$-$\mu$ universality in tau
decays suggests family gauge bosons with an inverted mass hierarchy. Under the
constraints from the observed $K^0$-$\bar{K}^0$ and $D^0$-$\bar{D}^0$ mixing,
we investigate a possibility that a mass $M_{33}$ of the lightest gauge boson
$A_3^3$ which couples with only the third generation quarks and leptons is of
the order of TeV. It is concluded that $M_{33} \sim 1$ TeV is possible if we
adopt a specific model phenomenologically.
