Abstract: A Streamlined Transmission assembly is used to convert eccentric rotation created by the power section into concentric rotation to be received by a bearing assembly in order to drive the rotation of a drill bit attached to a drilling assembly section of a downhole tool. The Streamlined Transmission assembly can be configured with a joint that can alter the angle of the bottom hole assembly by the use of a bent housing section while maintaining the capability to transfer large torque loads. The joint of the bent housing section of the assembly is configured to decrease deterioration of a lower seal boot and wash in the lower joint by reducing the volume of turbulent flow adjacent to each structure.