Preheat oven to 350 degrees. Grease bottom of 9x13 pan. Combine pumpkin, milk, eggs, sugar, spices & salt in a large bowl. Pour into pan. Sprinkle dry cake mix evenly over pumpkin mixture. Top with pecans. Drizzle with melted butter. Bake for 50-55 minutes or until golden brown. Cool completely. Serve with whipped cream.