Collaboration will achieve EPA27 Phase 3 Emissions Standards compliance.INDIANAPOLIS, Oct. 21, 2024 /PRNewswire/ -- Allison Transmission is pleased to announce an uprate to its proven B400 and B3400 xFE fully automatic transmissions, including retarder models. The increased ratings will ensure Allison continues to offer unrivaled total economic value to bus fleets across North America. The uprated transmission models will now support ratings up to 350 horsepower and 1,150 ft. lbs. of torque. This increase i ...