- Preheat the oven to 350 degrees F. 
- Grease and flour a 10 cup bundt pan  (see Notes below) 
- In a separate bowl add the flour, baking soda, and salt.  Whisk to blend, set aside. 
- Add the vanilla extract to 1 cup of sour cream, set aside. 
- Mix the butter on medium speed until smooth and creamy.  Add the sugar gradually and mix on medium speed 3 to 5 minutes, or until the mixture is light and fluffy. 
- Add the eggs one at a time, mixing after each until the yolk is blended. 
- With the mixer on low speed, add the flour mixture alternately with the sour cream mixture.  Begin and end with dry ingredients.  Add the dry ingredients 3 times and the sour cream mixture twice. Mix just until incorporated. 
- Fold the diced peaches into the cake batter then spoon into the bundt pan. 
- Bake at 350 degrees for 1 hour or until a toothpick inserted into the center comes out clean or with just a few crumbs attached. Baking times may vary. 
- Allow to cool 10 minutes before turning out.  Do not allow to cool too long or it may stick to pan.