Like the others have said, sounds like torque converter drain back. TransGo has a kit for this problem alone, and "reprogramming" (not electronic) kits to improve shifting and other demons. Did the TF2 kit in my "72 Polara with A727, very nice. Shifts firm like my "79 Mercedes Diesel.
Don"t know how far back this problem goes, but at least to the early 60"s aluminum TorqueFlites. Torque converter circuit is also cooling and lubrication on these boxes. When in park, the flow is restricted, but in neutral it is not. Idle in neutral and it will pump up quick. When these transmissions are used in applications where the vehicle sits in park and high idle, like carpet cleaners and service trucks, the transmission fail from lack of lubrication.
Probably this problem is from the early days when TorqueFlite did not have a park position. Had to redesign the valve body to allow for park when they went away from push buttons.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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