I actually have come across this same topic repeatedly in my research!
If you are interested, see
Mukaddes, N. M. (2002). Gender identity problems in autistic children. Child: Care, Health & Development, 28(6), 529-532. doi:10.1046/j.1365-2214.2002.00301.x
Kraemer, B. , Delsignore, A. , Gundelfinger, R. , Schnyder, U. , & Hepp, U. (2005). Comorbidity of asperger syndrome and gender identity disorder. European Child & Adolescent Psychiatry, 14(5), 292-296.
Robinow, O. (2009). Paraphilia and transgenderism: A connection with asperger's disorder?. Sexual and Relationship Therapy, 24(2), 143-151.
Female-to-male transsexual people have more autistic traits. (2011). Mental Health Weekly Digest, 36-71.