Mix together pudding and milk, put in refrigerator to set.
Cream together cream cheese 1/2 cup sugar, pumpkin and pumpkin pie spice.
In the bowl of an electric mixer whip 3 cups whipping cream and 6 Tbsp sugar until stiff peaks form.
fold together 2/3 of whipped cream into the vanilla pudding
line the bottom of a 13x9 in pan with graham crackers.
Spread 1/2 of the pumpkin mixture, pudding mixture and 1/3 of the pecans over graham crackers.
Repeat with another layer of graham crackers, pumpkin, pudding, and pecans.
Add a final layer of graham crackers, spread remaining whipped cream on top and sprinkle with remaining pecans and a little pumpkin pie spice.
Cover and refrigerate for at least 3 hours before serving .