Frank Costello unresigned as Maryland track coach yesterday.

Costello, who submitted his resignation to the university in December, saying he would leave in June to enter private business, changed his mind yesterday, two days after his old coach and boss, Jim Kehoe, returned as acting athletic director.

"I have carefully reviewed the track program and as a result have persuaded Frank Costello to withdraw his resignation and remain as coach," Kehoe said. f

Costello had cited the limitations that Title 9 -- the federal law barring sex discrimination in college athletics -- would place on his program as his reason for resigning.

But sources in the school's athletic department said that a dispute with then-Athletic Director Carl James had as much to do with Costello's impending departure as anything. James resigned May 5 to become commissioner of the Big Eight Conference and formally was replaced by Kehoe Tuesday.

After announcing his resignation, Costello became embroiled in a dispute with star hurdler Renaldo (Skeets) Nehemiah that eventually led to Nehemiah quitting the team and announcing he will forfeit his scholarship his senior year.

Costello, an all-America high jumper at Maryland under Kehoe's coaching, was hired as track coach in 1974 during Kehoe's first stint as athletic director.