Peel shrimp, and devein, if desired. Set aside.
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.
I'm Cajun and this doesn't sound Cajun to me.
It sounds more Creole. Check out the difference and you will probably agree with me.