You will need to replace the drain with a new one, weep holes for sure.
If you go to www.johnbridge.com you should be able to get some mud pan instructions.
I've completed the demolition of my old shower, but am puzzled now. I am on a slab foundation. My drain pipe is not centered, and it rises about 2 inches off the slab. It does not appear to have weep holes, and I cannot remove it. Is it necessary to have the weep holes, and does it need to be removed?
From what I have read, my next step will be to lay down my curb, which is another challenge. My supply pipes rise 8" above the slab where the curb should go. Should I make my entire curb 8" high, or just the part by the pipes?. Should I use 2x2's instead of 2x4's so my curb will be on both sides of the pipes?
Here are some pics of my issues: