  The flipped trinification, a framework for unifying the 3-3-1 and left-right
symmetries, has recently been proposed in order to solve profound questions,
the weak parity violation and the number of families, besides the implication
for neutrino mass generation and dark matter stability. In this work, we argue
that this gauge-completion naturally provides flavor-changing neutral currents
in both quark and lepton sectors. The quark flavor changing happens at the
tree-level due to the nonuniversal couplings of $Z'_{L,R}$, while the lepton
flavor changing $l\rightarrow l'\gamma$ starts from the one loop level
contributed significantly by the new charged currents of $Y_{L,R}$, which
couple ordinary to exotic leptons. These effects disappear in the minimal
left-right model, but are present in the framework characterizing a flipped
trinification symmetry.
