Additional horsepower and new shift schedule are just two of the changes to Allison Transmission model-year 2010 automatic transmissions for trucks and buses. “We’ve always been committed to understanding and satisfying the needs of our customers,” said Jim Wanaselja, vp, North America marketing, sales and service. “That’s why we constantly analyze, refine and improve our products and features.”
Allison’s Load-Based Shift Scheduling (LBSS) feature has been optimized with a Super Economy shift schedule, allowing LBSS to upshift under cruising conditions for fuel savings. LBSS will continue to automatically select between economy and performance shift schedules based on the vehicle’s actual payload and the grade on which it is operating, teh company said.
LBSS is available on all highway series, pupil transport/shutter series, rugged duty series and bus series models. The Super Economy shift schedule is available with Shift Energy Manager (SEM), LRTP capable engines.
Horsepower and torque ratings on Allison 1000/2000 Series models have been increased to allow for a broader range of applications.
Allison 1000/2000 Series transmissions with SEM are now rated up to 340 hp and 660 lb.-ft. of torque. Without SEM, the engines are rated up to 300 hp and 575 lb.-ft. of torque.
Additional enhancements to the 1000/2000 Series reduce the power necessary to charge the oil lube distribution and main pressure system through the Variable Modulated Main feature. This feature reduces the main pressure when the clutch apply system does not require full main pressure. New Wave friction plates reduce internal drag, all of which improves fuel economy.
Also new for 2010 is increased lockup availability for Allison B 300 and B 400 models. The feature allows a transmission to shift into lockup in first range and stay in lockup through first to second shift by monitoring acceleration to determine when to activate lockup.