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The X1100 is a fully automatic shifting transmission which has been designed and developed for vehicles in the 49 to 60 ton class, operating at speeds of 40 to 50 mph. A modular design is utilized to provide application flexibility for diesel or turbine engines of 1300 to 1500 GHP, as well as adaption to the current M60 vehicle. This automatic transmission features a hydrostatic steer system with pivot steer, a four speed range pack, integral power brakes and a high speed reverse. The torque converter can be locked up in all gear ranges to provide optimum transmission performance.

The continuing improvement and development of off-highway working vehicles has demanded corresponding continuing advancements in transmission technology. As a result Detroit Diesel Allison will introduce, in 1973, the Allison CLBT 750 fully automatic transmission for service in the off-highway market of 20 to 35-ton trucks and 15 to 20-yard scrapers. The CLBT 750 transmission was designed as a five-speed unit with automatic shift modes for second through fifth ranges. Design activity on the transmission included development of a hydraulic controls system which would provide optimum shifting for all conditions of engine and vehicle speeds and loads while ensuring that those shifts, both up and down, are smooth, positive, and safe. The design activity also included development of a minimum size, high capacity, highly responsive retarder to ensure safe descent of steep grades.

Through the years, changes have occurred in vehicle design that have necessitated a re-evaluation of transmission shift systems. Vehicle trends have been towards increased size, articulation, and multi-power usage. Mechanical linkages for these vehicles have become costly to design and build, and are troublesome to maintain due to wear, improper adjustment, and damage. In 1968 an electric shift control concept was introduced for the off-highway heavy duty transmission market to eliminate the problems associated with mechanical, hydraulic, and air linkages. This system consisted primarily of three components: shift tower, wiring harness, and range selector control valve body. Now a new electronic shift control has been developed which enables the transmission with electric shift to achieve the optimum in fully automatic operation.