Cut sausage into 1/4-inch-thick slices. Cook sausage in a large skillet over medium-high heat 5 minutes or until golden brown. Remove sausage, and drain on paper towels, reserving drippings in pan. Set sausage aside.
Sauté onion and bell pepper in drippings and hot oil 8 minutes or until tender. Add garlic, and sauté 1 minute.
Whisk in flour, and cook, whisking constantly, 1 minute or until flour is browned.
Whisk in chicken broth. Bring to a boil; reduce heat, and simmer 2 minutes. Stir in shrimp, and cook, stirring occasionally, 4 minutes or just until shrimp turn pink. Stir in sausage, crabmeat, and next 4 ingredients; cook, stirring occasionally, until thoroughly heated. Serve immediately over hot cooked grits.