'99 Accent Manual Transmission ?
 

When I'm moving and I shift into 2nd there's a "clunk" sound and it
feels sort of crunchy. Not under the car but right in the stick shift
area. It doesn't do this when the car is stationary.

Is this normal?

The car has about 66k kilometers on it and my guess is nothing has ever
been done to the transmission and it probably has the original fluids.

Does it need more transmission fluid?

Chris