Howard Stern got his Wack Pack back in line ... forcing Elephant Boy and High Pitch Eric to settle the beef that led to Eric's arrest.
Stern skillfully negotiated a cease-fire on his show Monday morning. TMZ broke the story ... Eric got busted on Friday for threatening to kill Elephant Boy.
The feud was still simmering when Stern brought 'em together, but then made them offer olive branches, and promise to leave each other alone. Listen to the peace summit -- these guys might be pissed, but in the end ... they know it's Howard's world.