Refrigerate unopened cans of soda, milk and pineapple until completely cold. In a large bowl, combine soda, milk and pineapple; mix until blended., Fill cylinder of ice cream maker no more than two-thirds full; freeze according to the manufacturer’s directions. (Refrigerate any remaining mixture until ready to freeze.), Transfer sherbet to freezer containers, allowing headspace for expansion. Freeze 2-4 hours or until firm.