An unbalanced traffic load distribution leads to a degradation of network performance; most of nodes in the network are heavily loaded, resulting in a large queue, a high packet delay, and high energy consumption. The optimization of load balancing to avoid congestion has been the subject of many researches in recent years. Many authors have proposed different solutions to anticipate the failure of route in Manets by adding a function that predicts the failure of the links to distribute the traffic load on all nodes of the network. In this paper we propose an extension to the AODV-balanced protocol named AODV_SPB ? ad hoc on demand distance vector with stable path, less congested with load balancing ?, which looks for a stable and less overloaded path .A comparative study is done under the NS2 simulator with AODV and AODV-SPB. This last protocol shows its effectiveness with respect to the two protocols cited in terms of; overload, delivery rates of packets and the average of delay with 4 simulation scenarios.