The power shift was different than the rest. The rest were more or less standard gearboxes with something ahead of them... and that something was a two or 3 speed gearbox that was shiftable on the go. With a TA, you had the speed you were in, or you could engage the TA, which slowed the tractor by about a 1/3rd. You did not necessarily switch to the next slowest speed, you just slowed down as much as the TA was geared for. The TA was essentially a planetary gear box that would allow for the slower speed. Either you were in direct drive, or the planetary slowed things down. A clutch engaged and disengaged things.
I believe Oliver was similar. Hopefully someone will explain that! There was also MM ampli-torq, which I think was similar to TA.
Power shift in Deere's case was essentially a series of planetary boxes, that were engaged by a number of hydraulic clutch plates. Shifting meant one clutch engaged and another disengaged, and it changed the sequence of how the power was directed through the series of planetaries. This system allowed you to go from neutral through road gear without ever using the clutch. The others required using the clutch between the main gears, but you could shift the hi/lo without clutching.
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