Marine Over 40 new and used models available to suit your engine size in the range from 10 - 15,000 hp also available: Used Truck Gearboxes     Examples: New Advance 135A 270 hp @ 2,000 rpm Available for Cummins NT855, Caterpillar 3306, Detroit cV-92TA. Used Twin Disc MG514 Twin Disc MG514 Marine Gear