In a small bowl, combine the cracker crumbs, brown sugar, pecans and cinnamon. Stir in butter; set aside. Prepare cake mix according to package directions.
Pour half of the batter into a greased 13x9-in. baking pan. Sprinkle with half of the graham cracker mixture. Carefully spoon the remaining batter on top. Sprinkle with the remaining graham cracker mixture.
Bake at 350° for 40-45 minutes or until a toothpick inserted in center comes out clean. Cool on a wire rack. Combine confectioners' sugar and milk; drizzle over coffee cake.