A work vehicle transmission has a disconnect device control assembly. The assembly includes a shaft having a rotation axis extending through a housing of the transmission. A disconnect device is mounted for co-rotation with the shaft about the rotation axis and has disengaged and engaged conditions. A gear is carried by the shaft to rotate about the rotation axis. The gear interacts with the disconnect device to rotate relative to the shaft in the disengaged condition and to co-rotate with the shaft in the engaged condition. A manifold is carried by the shaft and rotationally fixed relative to the rotation axis. The manifold defines a plurality of flow passages configured to route flow to the disconnect device. The manifold has an inner periphery that engages the shaft at a journal interface, which defines a flow passage for flow to pass from at least one of the flow passages of the manifold to the disconnect device.