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Understanding the thermal behaviour of automotive transmissions is essential for a number of design considerations, notably cooling system design, operational behaviour and reliability.This paper studies the thermal behaviours of a two-speed dual clutch transmission using for electric vehicle via testing and simulation.After developing a model for the power losses of the transmission, a compact thermal model is integrated.Transient heating simulations for the transmission are conducted at constant speeds and compared with experimental studies, showing a strong correlation between results.Simulations are then utilised to investigate the load and speed dependencies of the transmissions thermal behaviour, demonstrating that speed dependent losses have a particularly strong influence on transmission heating.