The ornamental design for a gearshiftknob for automobiles, as shown and described.
FIG. 1 is a front elevational view of the gear shift knob for automobiles showing my new design, the rear elevational view, the right side elevational view and the left side elevational view appearing the same as the front elevational view;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a perspective view thereof taken from the top, front and right side of the gear shift knob for automobiles.
Those portions of the drawings shown in broken lines are for illustrative purposes only and are not part of the claimed design.