It certainly can't hurt. Go for it.
In regards to the customer's car I mentioned, after replacing the TCC solenoid, filter, pan gasket & fluid, it shifted beautifully. However, it was apparent from the tool marks on the drain & filler plugs that it had been serviced before, and underfilled. It took a little over 7 quarts of Redline D4 to fill up... & there were no external leaks.