What year/spec 727?

I have checked the fluid with engine running and as needed. The kickdown is not installed yet, but I don't see it having an importance at idle and near idle speeds.

Things went more weird today. I measured the line pressure from the port as shown here: http://www.civilianjeep.info/Transmission/Automatic/TorqueFlight/TFrighsidePressure02.gif

It was surprising, that after about 1minute running, it did engage very firmly both drive and reverse, with 700rpm. But, the line pressure showed 0 in R and N, and only 30 Psi in D. How could it be, to have firm engagement with near-zero pressure? I understand there could be somekind of measurement problem, but readings 0, 0, 30?