Tier II-compliant PS760 gearboxes come with a 4- or 6-speed transmission. Upgraded shaft bearings and forward/reverse clutches provide increased durability and input torque to 590 foot-pounds. The 6-speed transmission has an option of 737 foot-pounds input torque and provides speeds up to 28 mph. An optional ECU delivers shift protection and full automatic transmission control. The gearboxes come with a manually applied wet parking brake.