PHOENIX, Ariz. (AP) _ Greyhound Lines Inc. workers need to revise their bargaining strategy after rejecting a proposed contract that would have frozen wages for four years while protecting some jobs, a union official says.

Workers rejected the contract 4,600-3,202, said James Cushing-Murray of Los Angeles Local 1222 of the Amalgamated Council of Greyhound Local Unions.

Greyhound, the nation's largest intercity bus carrier, said it will ''have to study the situation in light of the vote and take those actions which are necessary for the well-being of Greyhound Lines in the future.''

The Phoenix-based carrier said it would reveal its plans within 30 days.

The workers had voted by mail on the contract last year, but counting the ballots was delayed because Cushing-Murray and other opponents of the contract filed suit alleging that the rank-and-file was misled about its impact.

The proposed four-year pact would have been retroactive to Nov. 1, 1985, modifying a contract that ended a strike in 1983. A contract that expires Oct. 31, 1986, remains in effect, Cushing-Murray said.

Negotiations on a new contract began soon after Greyhound announced in August it would lay off one-sixth of its management staff, cut routes and close terminals because of declining business.

Opponents had said the proposed contract would cost up to 7,600 union jobs. Proponents argued that more jobs could be lost if concessions were rejected.

Cushing-Murray said in a telephone interview from the Scottsdale motel where he was staying Monday night that his group plans to drop its suit because the contract was rejected.

Union members meeting in Scottsdale would stay there for a few days to map out a new strategy for bargaining with Greyhound, he said.