How do I install a GFCI receptacle to replace an old non-GFCI receptacle in a switch controlled outlet?
If the box is being fed by a three wire cable (black, red, white, ground), and a two wire cable is going from the box to other outlets.  Here's what you have to do...


Leave the black wires alone.
Connect the white wires together with a short bit of scrap wire, in a twist-on wire connector.
Connect the other end of the short bit of scrap wire (pigtail) to the neutral LINE terminal on the GFCI.
Connect the red wire to the hot LINE terminal on the GFCI.
Connect all the ground wires and create a pigtail to the GFCI and the box if it's metal.


NOTES:


This will not provide GFCI protection to any down stream devices (since there are none).
Make sure the GFCI you have, does not require you to reset it whenever it loses power (some do, and that will be a pain in the butt).