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The driver can override it but it is normally driven in "D". It can have 12, 13, or 14-speeds. [5] Other Mack manual transmissions have 8-18 speeds. Eaton-Fuller UltraShift automated shifting systems are available on all of their transmissions from 9- to 18-speeds. Allison RDS series 5- or 6
The B-series was the first Mack truck produced with a diesel engine, introducing the Mack-produced Thermodyne inline-6 in 1953. [1] During 1966, Mack replaced the B-series with the Mack R-series, which lasted into the 21st century. [3] [4] [5] In total, 126,745 examples of the B-series were produced over 13 years. [6]
The U series superseded the C series, with a BBC length only one inch longer (89 vs 90) but with the improvements of the R cab. While the U series was only ever offered as a tractor, the offset cab layout would also be used in the DM series. The DM was an extra-heavy-duty version of the U often used in 6×4 construction trucks.
The F Model offered 5 different diesel engines, Mack's Maxidyne and Thermodyne at 260-375 hp, Cummins - 250-350 hp, Detroit Diesel - 270-430 hp and Caterpillar - 325 hp. Cat3406 is a big-bore diesel available in both high-torque-rise and conventional torque-rise versions
They used the same EY 707 cu in (11.6 L) overhead valve inline 6 cylinder gasoline engine developing 170 hp (130 kW) as the NM series. The NO-2, −3, −6, and −7 varied only in details (NO-1, −4, and −5 were single prototypes). 2050 production NOs were built in 1943–1945, all 1097 NO-3 and −6 models were exported.
The Mack MC/MR series, also known as the "Cruise-Hauler", is a cabover truck first introduced in 1978. [1] It is of a distinct "set back front axle" design (first seen on the Mack FM), with the driver compartment mounted ahead of the front axle and with a large, flat, divided windscreen covering almost half of the truck's frontal aspect.
The M39 series 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled.
The M123A1 built in the 1960s had a Cummins V8‑300, a 785 cu in (12.9 L) naturally aspirated V8 diesel engine developing 300 hp (220 kW) at 3000 rpm and 580 lbf⋅ft (786 N⋅m) torque at 2100 rpm. This engine was also retrofitted into M123 to make M123E2. No M125 were converted to diesel power. [1] [3] [5] [6]