Combine Jell-o and boiling water. Cool. Add bananas, pecans, strawberries, pineapple, and stir. Divide in half. Pour half into 12x8 pan. Refrigerate 1 hour to set. Keep remaining Jell-o at room temperature. Spread sour cream over set Jell-o, pour on remaining jell-o. Cover and refrigerate until set, about 1- half hours or overnight. Enjoy, * Jeannie *