A judge agreed with a joint Crown-defence recommendation that Benoit Roberge be sentenced to four years each for breach of trust and gangsterism, with the two to be served consecutively.
With time already spent in detention, Roberge, 50, has seven years and three months to serve.
He must serve half of his sentence before being eligible for parole.
The Crown said Roberge sold information to the Hells Angels, ultimately pocketing about $125,000 between October 2012 and March 2013. The money has mostly been returned to authorities.
A tearful Roberge explained during his guilty plea last month that he'd been threatened into co-operating with the gang and had made a mistake by not reporting it to his superiors.
The biker with whom he was associating, Rene Charlebois, committed suicide last year after escaping from a minimum-security jail.
Roberge is a former organized crime investigator who frequently testified as an expert on the Hells at their criminal trials.
The case centred around recordings of conversations between Charlebois and Roberge that surfaced after the biker's suicide last Sept. 26. He'd been on the lam for 12 days from a minimum-security prison and took his own life as police moved in to capture him.
A third party, whose identity is protected by a publication ban, made police aware of the tapes and gave them certain information about the nine recordings.
Roberge officially retired from the Montreal police last August after a 28-year career. He worked for the province's tax agency but was fired after his arrest.