The ornamental design for a helicalgeardifferentialhousing, as shown and described.
FIG. 1 is a front perspective view of a first embodiment of a helical gear differential housing showing the new design.
FIG. 2 is a rear perspective view of the first embodiment of the helical gear differential housing of FIG. 1.
FIG. 3 is a front view of the first embodiment of the helical gear differential housing of FIG. 1.
FIG. 4 is a rear view of the first embodiment of the helical gear differential housing of FIG. 1.
FIG. 5 is a first side view of the first embodiment of the helical gear differential housing of FIG. 1.
FIG. 6 is a second side view of the first embodiment of the helical gear differential housing of FIG. 1; and,
FIG. 7 is a third side view of the first embodiment of the helical gear differential housing of FIG. 1.
Any portion of the helical gear differential housing shown in broken lines is for the purpose of illustrating environmental structure and forms no part of the claimed design.