my opinion ? i don't think it will hurt a thing.
i base this on my experience with a 727 [yes, i know it's NOT like the 46RE transmission] i purposely dumped a quart of motor oil into, as per a magazine article i read at the time, stating this would help with lubrication.
that transmission worked for many thousands of miles afterward, with no problems whatsoever.
just my opinion. mileage from others will inevitably vary.