As the vehicle accelerated, rear pump output would increase and initiate a shift to direct. The rear pump pressures were modified by a throttle valve, and governor, both of which could delay the upshift, or even trigger a forced downshift at driver command.
As the vehicle accelerated, the rear pump's output would rise, causing it to shift directly. The pressures in the system were regulated by a throttle valve and governor, which could either delay the upshift or, at the driver's behest, initiate a forced downshift.