A drive assembly is disclosed, including a housing cylinder with a cap end, an attachment end with a first attachment surface, and gear teeth disposed around an inner circumference to form at least one ring gear. A planetary gear set may be surrounded by the housing cylinder and includes at least one sun gear and at least one set of planet gears. An output interface may include an interface body and an annular attachment lip with a second attachment surface. The housing cylinder may be attached to the attachment lip for operation of the drive assembly via the second attachment surface contacting the first attachment surface, with the cap end of the housing cylinder extending axially past an axial end of the attachment lip. Rotational power may be transmitted from the planetary gear set to the output interface via the gear teeth and the contact between the attachment surfaces.