The clergy of his rite asked him to reorganize his pastoral ministry. After Bishop Dragomir's death on 25 April 1985, he held the provisional function of Ordinarius of the diocese of Maramureș until 9 August 1986, and since that date, the selection and proposal of the diocesan chapter, Mureșan was installed on the property by Metropolitan Archbishop of Făgăraș and Alba Iulia Alexandru Todea. In December 1989, the Romanian Revolution occurred, the communist government was overthrown by force and the head of state, Nicolae Ceaușescu, was executed. Shortly thereafter, the Romanian Greek Catholic Church was legalized.
