Dayan Viciedo, Chris Beck, Trayce Thompson and our #3 international FA slot to the Yankees for Gary Sanchez and Mason Williams.
Both prospects are at least partially blocked in New York and the Yankees love to trade their best prospects for immediate help.
The Yankees would get a LF power bat with Gardiner moving to CF and Granderson leaving as an FA, decent mid level pieces and more international FA cap room. The Sox would get two top 50 prospects in our catcher of the future and a toolsy outfielder with better hitting acumen that any of our current OF prospects.
My only misgiving is that the Yankees would likely ask for one of Hawkins or Johnson instead of Beck and Thompson.