Mitsubishi 1993 3000GT, Technical Information Manual, Page: 65 / 216

Then the chamfer of the outer synchronizer ring spline and the
chamfer of the synchronizer sleeve spline come in contact.
As a result of this contact, a major pushing force is generated in the
outer synchronizer ring, the friction torque between the synchronizer
cone and outer synchronizer ring and inner synchronizer ring
increases, and then the difference in rotational speed of the 1st
speed gear and the synchronizer hub disappears.
Under these conditions, since the synchronizer sleeve is pressed to
the left, the synchronizer sleeve spline and outer synchronizer ring
spline mesh.
Also, when the synchronizer sleeve moves to the left, the
synchronizer sleeve spline chamfer comes in contact with the clutch
gear spline chamfer of the 1st speed gear, and then the clutch gear
spline and synchronizer sleeve spine mesh to complete the shift to 1
st speed.
POWER-TRANSMISSION COMPONENTS -
Manual Transmission
2-9