I'm seeks SPECIFIC contact information for overseas t-shirt
manufacturers. I want to produce high-end, full color printing on
black t-shirts. I'm looking for low-cost overseas manufacturers that
can do this. I'm not looking for general links--but specific company
names, informtion and contact info.

Since we don't know where you are, we can't know what "overseas" means
to you. Everyplace is overseas to somebody. ;-)

Please clarify your specific requirements on the nature of T-shirt (
Cotton/ Poly cotton/ Synthetic) and your location for calculation of
transportation  costs and I may be able to provide the same for you
from India, provided the numbers are greater than 2000 at a mutually
agreeable price.