The Mack TRL1076 is a triple countershaft transmission providing five forward speeds and one reverse speed. Short in length, light in weight and easy to service, this new transmission is designed for use in over the road trucks and tractors particularly in long-distance operation on varied terrain. Both transmissions are identical except for the elimination of the upper left-hand rear countershaft in the TRL1076.The five-speed gearset is housed in a high strength aluminum case which is constructed in two pieces for maximum convenience of disassembly and reassembly. Cast iron liners are cast in the aluminum case at all shaft bearing locations. These liners assure maximum service life plus the advantages of lightweight construction. Unlike conventional transmissions, three countershafts are equally spaced around the input shaft. This design provides extremely high capacity in the shortest overall length. By distributing the load equally among three shafts, normal deflection is reduced to a minimum. Another unique design is that the main shaft gears are self-centered among the three countershafts, eliminating the need for gear bushings. The main shaft gears are connected to the main shaft only when engaged by a sliding clutch.

All gears of the gearset are of the spur type design and with the exception of reverse speed sliding gear, are in constant mesh with the countershaft gears. Other than the reverse, driving engagement for the five forward speeds is effected by means of the sliding clutches. The reverse is obtained by engaging reverse sliding spur gear with the three individually mounted idler gears. Conventional forks spanning the sliding clutches and reverse
gear, move these parts in response to the movement of the gear shifter hand control lever by the driver.

Specifications

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Differentials, Transmissions, Transfer Cases & PTOs are new and rebuilt by Pro Gear and covered with a one year, unlimited mileage warranty. *See warranty. All other warranties are that of the manufacturer.