Allison Transmission has rolled out the new Load-Based Shift Scheduling (LBSS) feature for 2009 Allison 1000/2000/3000/4000 Series models, available now.

LBSS automatically selects between economy and performance shift schedules based on the vehicle’s actual payload and the grade on which it’s operating. This optimizes fuel economy while maintaining productivity, says Allison, even during heavily loaded situations.

Using advanced algorithms to calculate real-time vehicle load and grade, LBSS is calibrated to primarily use the economy mode, but automatically selects the performance mode when conditions require it. LBSS is part of the standard Shift Energy Management (SEM) calibration for approved engines.