4 cups all-purpose flour
1/2 teaspoon salt
2 teaspoons baking powder
2 teaspoons baking soda
1 cup butter, softened
2 cups granulated sugar
4 eggs
2 teaspoons vanilla extract
2 cups mashed bananas
1 cup 7-Up

Preheat oven to 350 degrees F. Stir together dry ingredients and set aside. Cream butter and sugar in a large bowl. Add eggs, beating well after each addition. Add vanilla and bananas, mixing well. Add dry ingredients alternating with the 7-Up, finishing with dry ingredients.
Pour into 2 greased loaf pans.