Most of the time I don't notice my gender in my dreams, but pre transition, I dreamt sometimes as a boy, occasionally as a girl - when I transitioned, I normally dreamed as a pre-op female - and post op, I had a few dreams about surgery where the vagina was created but part of the penis was left on! In those dreams I was told I would have to go on a waiting list again to remove the rest of it. Pre-op I had a couple of 'boy in female clothes' dreams, but now post op, the dreams are exclusively female, if I notice my gender in it.
Pre-op I also dreamed several times about having the surgery, and curiously enough, I vividly remember the feeling of having a vagina in those dreams, and it is remarkably similar to how it feels now, in reality, post-op. One day in the hospital recovering from SRS, I had a reverse version of this dream, where instead of dreaming of being post op and waking up to find I was still pre op, I had a dream I was pre-op and woke up to my relief that the monstrosity down there was indeed gone!