A clutch collar comprising: an outer surface that extends around an axis ; an inner surface that is disposed opposite the outer surface ; a clutch collar face gear that has a first tooth that extends from the inner surface to the outer surface , and a second tooth disposed adjacent to the first tooth, wherein the first tooth includes: a first flank that is continuously curved in a direction that extends from the inner surface to the outer surface ; and a second flank that is disposed opposite the first flank and is continuously curved in the direction that extends from the inner surface to the outer surface , and an annular groove that is spaced apart from the clutch collar face gear and extends from the outer surface toward the axis , wherein the first tooth has a dovetail profile in which the first flank and the second flank become progressively further apart in an axial direction that extends away from the annular groove , characterized in that a root surface extends from the first tooth to the second tooth and from the inner surface to the outer surface , wherein the root surface is nonplanar and is disposed further from a normal plane where the first flank of the first tooth meets the outer surface (point B) than where a second flank of the second tooth meets the outer surface (point D); wherein the normal plane is disposed perpendicular to the axis and extends through the annular groove . an outer surface that extends around an axis ; an inner surface that is disposed opposite the outer surface ; a clutch collar face gear that has a first tooth that extends from the inner surface to the outer surface , and a second tooth disposed adjacent to the first tooth, wherein the first tooth includes: a first flank that is continuously curved in a direction that extends from the inner surface to the outer surface ; and a second flank that is disposed opposite the first flank and is continuously curved in the direction that extends from the inner surface to the outer surface , and an annular groove that is spaced apart from the clutch collar face gear and extends from the outer surface toward the axis , wherein the first tooth has a dovetail profile in which the first flank and the second flank become progressively further apart in an axial direction that extends away from the annular groove , characterized in that a root surface extends from the first tooth to the second tooth and from the inner surface to the outer surface , wherein the root surface is nonplanar and is disposed further from a normal plane where the first flank of the first tooth meets the outer surface (point B) than where a second flank of the second tooth meets the outer surface (point D); wherein the normal plane is disposed perpendicular to the axis and extends through the annular groove . a first flank that is continuously curved in a direction that extends from the inner surface to the outer surface ; and a second flank that is disposed opposite the first flank and is continuously curved in the direction that extends from the inner surface to the outer surface , and an annular groove that is spaced apart from the clutch collar face gear and extends from the outer surface toward the axis , wherein the first tooth has a dovetail profile in which the first flank and the second flank become progressively further apart in an axial direction that extends away from the annular groove , characterized in that a root surface extends from the first tooth to the second tooth and from the inner surface to the outer surface , wherein the root surface is nonplanar and is disposed further from a normal plane where the first flank of the first tooth meets the outer surface (point B) than where a second flank of the second tooth meets the outer surface (point D); wherein the normal plane is disposed perpendicular to the axis and extends through the annular groove . <EOS>