Gears are known as important mechanical parts with various industrial applications. Many researchers investigated the complex nonlinear behavior of the geared systems by studying the effect of the clearance between the gears in mesh. This is while some studied the effect of both nonlinear suspension and clearance on nonlinear characteristics of such systems. Most of these studies are under assumption that the system operates under lightly loaded operational condition, where the separation of the teeth in mesh occurs. Alternatively, in this work, it is assumed that the transmitting load is big enough that gears in mesh do not separate and consequently the clearance between the teeth do not participates in the dynamic response of the system. Then analytical and numerical techniques are used to investigate the effect of nonlinear suspension on the dynamic behavior of the system. The results show that nonlinearity of the suspension has a great in uence on the creation of the nontrivial equilibria or limit cycle within the unstable regions, which for the right range of the parameters, can affect the rate of the amplitude detonation and stabilization of the system.