A-727 small metal debris in pan - rebuild?

CudaFactHackJob said

All of that debris could have come out of the cooler. But are you saying that your trans shifts into third at below 20 mph even at wot?

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It is difficult to discern the gear changes, must be very soft. It will accelerate like fury and is a bit of a handful; I hope to take my foot off the load pedal before it gets too out of shape, but any time I choose to check (by changing from D to 2) it always shows that it was already in 3rd by then.
I can't feel the 1-2 shift and I have to really concentrate to feel the 2-3 shift.
The fluid could have been changed just before I bought it (Aug19). All of the other parts are good quality; Blueprint crate motor, aluminium radiator, tubular upper control arms, rear discs, F&R anti-roll bars. Plenty spent by previous owner such as braided trans cooler lines; it doesn't make a whole lot of sense to have abused/not serviced the fluid until just before selling.