HEAT oven to 350ºF.
COMBINE sugar and seasonings; rub onto both sides of ribs. Place in foil-lined 13x9-inch pan.
BAKE 1 hour. Meanwhile, mix barbecue sauce and dressing until blended.
HEAT grill to medium heat. Remove ribs from pan. Grill 15 min., turning after 8 min. Brush with 1/2 cup of the barbecue sauce mixture; grill 5 min.
SERVE ribs with remaining barbecue sauce mixture.