"I wrote them a letter, I tried to get in contact with Angus... I've had no contact with anybody," Rudd tells Australia's A Current Affair. "I'm very disappointed, yeah. But that's life," adding, "You know who your friends are, really."

After Rudd recorded "Rock Or Bust" with AC/DC in Vancouver last year, the band hired former member Chris Slade to handle drum duties in his place for the group's world tour, which launched on April 10 at Coachella. "I'm sure they're having a great old time," says Rudd. "I'm sure they're really enjoying playing. I'm sure it really sounds great."

Last month, Rudd pleaded guilty to drug charges and threatening to kill a former assistant at a hearing in Tauranga District Court; he could face up to seven years in jail when he returns for his June 26 sentencing.