In a saucepan over medium heat, combine sugar and cornstarch. Add water and bring to a boil. Continue to boil or 3 minutes, stirring constantly. Stir in the peach gelatin mix. Remove from heat and allow to cool.
In a large bowl, combine the sliced peaches with the gelatin mixture. Gently stir until peach slices are coated with gelatin. Pour into baked pie shells. Refrigerate until set.
