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The new Allison M6600 and M9600 transmissions incorporate continuous improvement items to achieve greater robustness in terms of reliability and durability. This was partially accomplished by incorporating components from higher - capacity transmissions into current products with minimal redesign and tooling. A key life factor for all transmission components is adequate lubrication and cooling, and improvements in this area were accomplished by decreasing restrictions and better utilization of oil that was previously exhausted to sump. The new transmission models have further enhancements to clutch life through improved control of clutch torque and slip times. These clutch improvements were developed through the use of improved computerized evaluation techniques utilizing lap-top computer programs. Also, a transmission -mounted floating-caliper, disc type park brake with integrated controls is being evaluated as a possible replacement for the current drum-type brake.

The 40-plus year history of the off-highway automatic transmission has been characterized by change. Ever-increasing demands in the marketplace have caused an evolution of design and features in transmissions to maintain competitive advantage. Allison Transmission's new models, CL(B)T-5963 and CL(B)T-6063, are being released to improve productivity and driveability. The incorporation of a programmable trim boost feature in the Allison Transmission Electronic Controls makes possible improved shift quality that will increase driver comfort. The addition of a two-speed reverse allows for a deep ratio reverse that helps provide ample pulling power to negotiate through severe conditions, and a shallow ratio to give increased speed in reverse that will help reduce cycle time.