sentences:  In 1984, the Cummins L10 was introduced as an option.Following the launch of the product line, the GMC Brigadier quickly overtook the Chevrolet Bruin in sales and market share.After the 1981 model year, General Motors ended sales of heavy trucks by the Chevrolet Division, leading to the cancellation of the Chevrolet Bruin, Bison, and Titan.