Gendron did not run in 1874 for a federal seat after a so-called "dual mandate" became illegal; he was elected again to the Quebec assembly in 1871 and 1875.
He resigned his seat to become prothonotary for the Quebec Superior Court in Montreal district serving until 1887, when he returned to Saint-Hyacinthe.
Gendron was also president of the Lake Champlain and St.
Lawrence Junction Railway.
He died in Saint-Hyacinthe in 1889 and was buried at Sainte-Rosalie.
His nephew Flavien Dupont also represented Bagot in the Quebec assembly and in the House of Commons.