INDIANAPOLIS—Firestone Industrial Products Co. L.L.C. likes to tout itself as the maker of the "World's No. 1 Air Spring." It's a moniker the company takes very seriously, having invented air spring technology in 1938. But while the company long has boasted a dominant market share in North America, it now is taking steps to boost its presence and sales in other parts of the world—particularly in Eastern Europe and the emerging markets of China and India.