WV64Signet said

Also need to add the shift from a dual (front and rear) pump system that occurred in 65(??)

The hydraulics flows changed as well because as it seems to me, the use of the.park cable was a mechanical block to the transmission's ability to engage the drive bands and was not related to the flow in Neutral.

The addition of a true "Park" position in 65 created a change in hydraulic flow that differs from the neutral position.

That's a novice's assessment at least

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