SABR is a proven shaft, gear and bearing concept design package. It has been developed to integrate into the design process, reducing product development time by saving months of expensive durability testing. Using an intuitive graphical user interface, all or part of the transmission system can be modelled at a level of detail appropriate to the current design phase. Sensitivity studies to determine the effect of different geometric features, such as bearing types and gear positions can be performed quickly, delivering immediate results. SABR guides durability improvements and directs early NVH solutions whilst reducing gearbox losses, cost and weight, all instrumental in transmission efficiency.