  We analyze the breakdown of SUSY GUTs driven by Nambu--Jona--Lasinio
condensates. Starting with the most general gauge invariant and pure
K\"ahlerian Lagrangian up to quartic order we solve the one loop gap equation
and determine the breaking direction. This is done for various classes of
groups and spectra of fundamental particles which especially cover the most
promising unifying groups $SU(5)$, $SO(10)$ and $E_6$. Heavy masses for the
fundamental as well as for the composite particles are calculated. The results
are used to single out candidates which may lead to an acceptable low energy
theory. In these models we discuss some phenomenological aspects and point out
the difficulties in constructing phenomenological viable theories in our
scenario.
