He first entered Turismo Carretera in 1967 after being signed by the official Industrias Kaiser Argentina team, where he won his debut race.

In the highest category of Argentine motorsports, Gradassi was able to become champion four times, always driving a Ford Falcon.

During his time at Ford, he got to know other well-known TC competitors such as Nasif Estéfano, Esteban Fernandino and Juan María Traverso.

"Pirín", as Gradassi was nicknamed, was part of the Córdoba Automobile Club where he was a member of the board of directors for many years.

He was also part of a local Antique Car Club, with which he participated in many regular competitions even after retirement.