[2] The same year, the OC-9 introduced Oliver's Trans-O-Matic power-shift transmission, the case made of cast alloy steel.
[3] The hydrostatic transmission allowed for on-the-go changes between high and low ranges and also the ability to have one drive sprocket in forward and the other in reverse, something not possible with clutch type crawlers.
The transmission, along with power steering and instant reverse, made the crawler easily maneuverable.
[1] While a conventional clutch type bulldozer only allows for the engine's kinetic torque to be transmitted to the ground, a converter type set up allows the engine to build static torque and transfer more power to the ground.
The track frames were lighter duty, and some changes to the chassis allowed the loader arms to be fitted.