Machine description: Cummins HTC-400 6 Cylinder 855 cid Diesel 400 hp Engine, 1983 US EPA Label, Retarder, Caterpillar 16-Speed Automatic Transmission, 52160 lb Rears, 56000 lb GVWR, 11R24.5, Double Frame, Hendrickson Spr... more info about the 1980 Am General M916.