The TT mountings have a linear stiffness over a wide load range varying from compression (–) to extension (+) necessary to maintain the optimum isolation properties of the Mass-Spring system formed by engine mounts and gearbox mounts. The close coupled gearbox reduces the engine rpm’s and as a consequence, magnifies the engine torque. The reaction torque is transferred over the TT-mounts to the foundation as additional compression or extension force which enables the TT-mounts unique linear (compression / extension) stiffness to maintain the same high degree of isolation.