Allison Transmission, the largest global manufacturer of medium- and heavy-duty fully automatic transmissions acquired Walker Die Casting, a for-profit Tennessee corporation that produces high-quality aluminum die castings, and C&R Tool and Engineering, which produces die cast dies and tooling using the latest technology and processes, for $103m. “We are delighted to announce the acquisitions of Walker Die Casting and C&R Tool and Engineering. Walker’s products are a critical component in the manufacture and quality of our on-highway transmissions. We plan to grow the business and continue the heritage established by Robert Walker in 1958.” David S. Graziosi, Allison Transmission, President and CEO.