The arrangement was to help him with his immigration into the country.
Ms Ford later gave evidence against him at trial, where their marriage was described as a "sham".
The couple agreed in court that Dube stayed in Ms Ford's home only two or three nights a week, and shared a room with her teenage son.
Dube then used his stepson to send money to Nigeria and South Africa through Western Union transfers.
Some of the transactions were completed in the name on a stolen driver's licence. More than $450,000 was sent to Africa in the four months leading up to Dube's arrest.
Judge Grant Fraser sentenced him to 15 years in prison and ruled Dube was ineligible for parole until he served half that time. He will be deported on his release.
Sylver Dube
March 29, 2009: Arrived in Auckland from South Africa.
July 24: Marries Tihere Ford in Manukau registry office.
Feb 22, 2010: Arrested on methamphetamine charges.
Sept 27, 2012: Convicted and sentenced to 15 years in prison.