Preheat oven to 325 degrees F
Sift the cake mix into your mixing bowl. Add all of the other ingredients: instant vanilla pudding, 4 eggs, ½ cup pineapple juice, ½ cup milk, ½ cup vegetable oil, and vanilla extract.
Mix at medium speed for one minute. Scrape the sides and bottom of the bowl and mix one more minute. Pour or scoop the batter into the bundt pan, covering the brown sugar and fruit layers.
Bake for 45-50 minutes or until a skewer or toothpick inserted into the cake comes out clean or with just a few crumbs attached. Baking times may vary- check your cake for doneness as it approaches the 45 minute mark.
Cool the cake in the pan for 10 minutes before inverting it onto your cake plate or pedestal. Place the pedestal on top the the cake pan, and carefully flip it all as one (using dish towels or oven mitts to protect your hands from the heat.)
Leave the bundt pan upside down for a minute or two to give the the glaze a little more time to drip down. You may still have a bit of brown sugar in your pan- that is okay!
Serve warm or cool. If not serving right away, it is best to refrigerate and then remove from the refrigerator 2-3 of hours before serving.