1. A transmission calibration tool comprising: a user interface configured to accept a transmission topology description including a list of gearing components, a list of fixed connections among the gearing components, an input shaft, a turbine shaft, and an output shaft, a list of shift elements, a list of transmission states indicating which shift elements are engaged to establish each state, a list of speed sensors, and a list of torque sensors; a transmission interface configured to accept input signals from the speed sensors and the torque sensors; a processor programmed to monitor the input signals during a shift event and to estimate torques exerted by gear elements or shift elements at intervals during the shift event based on the input signals and the topology description; and a display configured to plot the torques after the shift event.