What to look out for when buying a 01 GT?

Romeo or Windser. Or T-45 or TR-3650. I think TR-3650 is slightly better trans. Other then that, make sure it hasn't been in accident, checl service record, Carfax...
 
Early 3650's tend to grind badly into 2nd.

If i was buying an '01, i'd feel better buying one with a T-45.

To check, read the door code. Under trans, the letter TR would indicate 3650. Anything else is the t-45