New York ? Seeking to add even more pitching for the second half, the first-place New York Yankees acquired Jeff Weaver from Detroit early today as part of a three-team trade that also included Oakland.

As part of the deal, the Athletics sent first baseman Carlos Pena, pitcher Franklin German and a player to be named later to the Tigers and the Yankees sent pitchers Ted Lilly and Jason Arnold and outfielder John Ford-Griffin to Oakland.

Weaver, a 25-year-old right-hander, is 6-8 with a 3.18 ERA this season on a Tigers team that is 30-53.

“The opportunity to go from last to first in a day is quite interesting in itself,” Weaver said.

He joins a New York rotation that already includes Mike Mussina, Andy Pettitte, Roger Clemens and Orlando Hernandez, one that has reduced Sterling Hitchcock to a reliever and spot starter.

Lilly, a 26-year-old left-hander, is 3-6 with a 3.40 ERA in 11 starts and two relief appearances.