US Army, Technical Manual, OPERATORS MANUAL FOR, TRUCK five-TON, 6X6, M39 SERIES TRUCK CHASSIS: five-TON, 6X6, M40, M40A1, M40A1C, M40A2C, M61, M61A1, M61A2, M63, M63A1, M63A2, M63C, M63A1C, M63A2C, M139, M139A1, M139F, M139A1F, M139A2F; TRUCK, CARGO: M54, M54A1, M54A2, M54A1C, M54A2C, M55, M55A2; TRUCK, DUMP: M51, M51A1, M51A2; TRUCK, TRACTOR M52, M52A1, M52A2; TRUCK, TRACTOR, WRECKER: M246, M246A1, M246A2; TRUCK, VAN, EXPANSIBLE: M291A1, M29A1D, M291A2D; TRUCK, WRECKER, MEDIUM: M62, M543, M543A1, M543A2; TRUCK, STAKE, BRIDGE TRANSPORTING: M328A1; TRUCK, BOLSTER: M748A1, TM nine-2320-211-10, 1977 Scope. a. This manual is in your use in operating and keeping up the five-ton, 6×6, M39 Series trucks. The type numbers and gear names are listed on pages i and ii. Operation and upkeep directions for special objective kits arc additionally included.