An integral transmission for a transmission turbomachine has two gearwheels which are in mesh with a large wheel and which are each connected to a shaft that can be connected to an input and/or output unit. A housing, in which the gearwheels or the shafts connected thereto are supported and at least two partial housing units which can be connected by a main joint that extends through the support region of at least one gearwheel in mesh at least indirectly with the large wheel or of the shaft connected to the gearwheel. Accordingly, one of the two partial housing units is formed from at least three housing parts including a central housing part, which is assigned to the large wheel, and two side housing parts. The central housing part can be connected to an individual side housing part by a joint aligned at an angle to the main joint.