Corporate History



The F Model all-steel sleeper and non-sleeper, cab-over-engine trucks were introduced. This was the first model of the completely new family of COE and Conventional models to be introduced in the 60's. Following models included the R, U, and DM.


Mack Produced one Super Pumper System for the Fire Department of New York City. It was delivered in 1965 and its first fire was on August 12, 1965. It answered 2,200 alarms and was placed out of service in 1982.

The system included a Super Pumper, Super Tender, and three satellite tenders. The combinations of tender and/or satellites used at any particular fire depended on the situation.


The R series, which replaced the venerable B series in 1966, proved itself in the tradition of its predecessor as one of the worlds most popular heavy-duty diesel trucks. Shortly after introducing the R model, Macks revolutionary Maxidyne constant horsepower diesel engine debuted, along with the Maxitorque transmission.

RW model trucks were built at Mack Western in Hayward, CA from 1966 through 1981, when production was transferred to the Macungie plant.

Mack Trucks, Inc. becomes a member of the Signal Oil and Gas Company, a Los Angeles based petroleum company. In August 1967 Mack Trucks, Inc. officially became a member of a growing industrial family, The Signal Companies, Inc.

The Maxidyne engine was introduced in 1967, and provided maximum horsepower over a wider range of engine speeds than any other standard diesel engine of its day. The engines design leveled the horsepower curve and as a result, increased fuel efficiency and significantly reduced the need for shifting. It was such an improvement that a transmission with five speeds, rather than ten or more, could be used for most over-the-road applications.

The Maxitorque transmission (TRL 107 series), created in 1967, was the first triple countershaft, compact-length design for Class 8 trucks, featuring the highest torque capacity in the industry. The five-speed Maxitorque was only two-thirds as long as multi-speed transmissions, and its light weight made it a popular choice among operators concerned about gross vehicle weight.





In 1969, Mack pioneered and patented cab air suspension as a major truck ride and cab durability improvement.

Mack was the first heavy-duty diesel engine manufacturer of the day to produce its own engine compression brake -- the patented Dynatard engine brake in 1971. The Mack design was a customized, simpler brake system that was integral and compatible with the engine for top performance.