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Preheat oven to 350 degrees F (175 degrees C).
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Lightly grease two 9x5 inch loaf pans.
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In a large bowl, cream together the shortening and sugar until light and fluffy.
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Stir in the eggs one at a time, beating well with each addition.
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Stir in the mayonnaise and bananas.
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Stir together the flour, salt, baking powder and baking soda.
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Blend the flour mixture into the banana mixture; stir just enough to evenly combine.
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Fold in the chocolate chips and walnuts.
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Bake at 350~ until a toothpick inserted into the center of the loaf comes out clean, about 50 to 75 minutes.
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Cool loaf in the pan for 20 minutes before removing to a wire rack to cool completely.