Classic Machines Contractor TractorsClassic Machines: The Allis-Chalmers HD-5Contrafed PUblishingJune 22, 2020 by Contrafed PUblishingJune 22, 2020 Allis-Chalmers always had a good reputation for making reliable and versatile track type tractors, but its new HD-5 introduced in 1946 exceeded all expectations. By...