Straight-sided radial flank architecture

A transmission coupling assembly for transferring torque in a transmission from a first rotatable component to a second rotatable component and a method of assembling a transmission coupling assembly are disclosed. The transmission coupling assembly may comprise a first operative transmission component interconnected with a second operative transmission component. The first and second operative transmission components may each include a body adapted to be coupled to a respective one of the first and second rotatable components and a plurality of engagement features extending from the body along an axis of the respective operative transmission components. The plurality of engagement features are configured to intermesh during assembly of the transmission coupling assembly. The transmission coupling assembly may include a retainer received and positioned within recesses of the respective plurality of engagement features and compressed by a beveled surface of one of the plurality of engagement features during assembly.