Preheat oven to 350° Fahrenheit. Grease bottom of 9x13 cake pan.
Using a mixer, mix vanilla cake mix, eggs, butter and orange soda on medium speed for 2 minutes. Pour into cake pan and bake for 25 minutes or until toothpick inserted in middle comes out clean. Set cake aside to cool (about one hour).
When cake is cool, use a skewer or skinny handled wooden spoon to poke holes in cake. In a 2 C measuring cup, heat 1 C water to boiling in microwave. Add gelatin to boiling water and stir until dissolved. Add cold water and orange soda. Mix well. Pour gelatin mixture over cake, making sure it gets in all of the holes in the cake. Put cake in the refrigerator for 2 hours so that the gelatin can set.
When ready to frost, use a mixer to whip 1.5 C of heavy whipping cream and orange gelatin until cream forms stiff peaks. Frost cake with whipped orange topping.