The Toronto Blue Jays yesterday named Jimy Williams as the fourth manager in the history of the American League baseball club.

Williams, who succeeds Bobby Cox, said fans will see little difference in the 1986 Blue Jays. "I don't believe I'm a clone of Bobby Cox, but there's really very little need for change," said Williams, 42, who has spent the last six years as the team's third base coach.

The Blue Jays also announced that coaches Cito Gaston, Al Widmar, John Sullivan and Billy Smith have been re-signed for 1986.

Cox resigned Tuesday after four years as manager to become general manager of the Atlanta Braves of the National League.

Williams was signed to a one-year contract, reportedly for about $200,000.

Cox led the Blue Jays to their first AL East Division title this season, but the team lost to the Kansas City Royals in seven games in the best-of-seven AL Championship Series.

Williams will be managing a major league team for the first time. He was a minor league manager from 1974 through 1979, directing the Triple A Salt Lake City team to a Pacific Coast League title in 1979 . . .

A trade between the Chicago White Sox and New York Yankees hinges on Carlton Fisk and Don Baylor, according to the New York Times, which said the seven-player trade is contingent on the Yankees' signing of Fisk to a new contract and getting Baylor to approve a move to the White Sox. The trade, if approved, would send Fisk, pitcher Britt Burns and utility infielder Scott Fletcher from the White Sox to the Yankees for Baylor, a designated hitter who has asked to be traded, catcher Ron Hassey and two pitchers, Joe Cowley and Marty Bystrom.

Fisk can declare for free agency the day after the World Series ends. Baylor has a clause in his contract that gives him approval of any trade . . .

Former president Richard Nixon will announce his decision in the dispute over postseason pay for baseball umpires on Monday. Nixon, who was asked to arbitrate the case, will release his decision to the Major League Umpires Association and the baseball leagues at noon and make it public at 3 p.m., said John Taylor of Nixon's law office . . .

The Baltimore Orioles will raise prices by 50 cents a ticket for most seats at Memorial Stadium for next season, Executive Vice President/General Manager Hank Peters announced. Peters also said 3,273 seats that formerly were general admission will receive the new designation, "lower reserved grandstand," for the 1986 season. Those seats will be priced at $5.50, 75 cents more than general admission tickets. There still will be 13,304 general admission seats available at $4.50.