In medium mixing bowl, combine 3 cups milk, vanilla pudding mix and whipped topping; using an electric mixer, mix on medium speed until well combined. Set aside.
In another medium mixing bowl, combine remaining 1 cup milk, chocolate pudding mix, frosting, cinnamon and salt; using an electric mixer, mix on medium speed until well combined. Set aside.
Arrange a single layer of graham crackers in the bottom of a 13x9- inch baking dish. Spread half of the vanilla pudding mixture over crackers. Top with another layer of crackers and remaining vanilla pudding; top with final layer of crackers.
Spread chocolate pudding over top of cake; cover and refrigerate at least 4 hours before serving.
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