What Thomas said.
If you *are* looking for a new developer though, I really like XTOL for this film and others. One of the nice things about XTOL is there is a lot of data out there (from Kodak even) about using it with different films, at different dilutions, speeds, and temperatures. It also has a lot of other nice features.
Also, if you look at the T-Max 400 spec sheet, it gives you some different times for different dilutions (1:4, 1:7, and 1:9) of T-Max developer. The one without a listed dilution is 1:4. Look at page 4: