New York- A member of Howard Stern’s “wack pack” is in trouble with the feds after shooting off his mouth on the shock jock’s radio show.

K-Rock (WXRK-FM) deejay Crazy Cabbie is scheduled to plead guilty to a tax charge in Brooklyn Federal Court on Nov. 9, say sources familiar with the case.

Crazy Cabbie, 35, whose real name is Lee Mroszak, brags on K-Rock’s Web site that his secret talent is being able to put his fist in his mouth.

But sources said Cabbie stuck his foot in his mouth, big-time, by blabbing on Stern’s show about allegedly not paying taxes.

Federal investigators obtained a transcript of his potentially incriminating comments and began looking into his background, including whether he paid taxes on his cut from a 2002 boxing match with another Stern-show wacko, “Stuttering” John Melendez.

That bout in Atlantic City was billed as the “Flunky vs. the Junkie” – Melendez against Cabbie.

Cabbie was due in court yesterday, but the plea was postponed due to a death in his lawyer’s family. Cabbie faces less than a year in prison when he is sentenced.

The former Army paratrooper, who served in the first Gulf War, has talked openly on the show about his past drug addiction.

A spokeswoman for K-Rock’s owner, Infinity Broadcasting, declined to comment on Cabbie’s criminal troubles. Cabbie, who lives on Staten Island, could not be reached for comment.

The station has been hit with millions of dollars’ worth of fines by the FCC for raunchy talk on the Stern show. Two weeks ago, Stern announced he will move his popular show to Sirius satellite radio in 2006.