  The two-body transfer amplitude for the rearrangement process i+(jkl) -
j+(ikl) is constructed on the basis of technique of 4-dimensional covariant
nonrelativistic graphs. The developed formalism is applied to describing
backward elastic $p^3He$ scattering in the energy range 0.5 - 1.7 GeV.
Numerical calculations performed using the 5- channel wave function of the
$^3He$ nucleus show that the transfer of a noninteracting np- pair dominates
and explains satisfactorily the energy and angular dependence of the
differential cross section at energies 0.9 - 1.7$ GeV.
  A weak sensitivity to high momentum components of the $~^3He$ wave function
in spite of large momentum transfer as well as a very important role of
rescatterings in the initial and final states are established.
