More back hair? (sorry, don't mean to offend, just wondering how much back hair one could have pre-T, I've never seen it on a woman, really only see it on the hairiest of hairy men)
Like with all effects of T, body hair growth is heavily dependent on genetics. If the men in your family have lots of back hair, chances are you will too. If they don't, you probably won't. But if you already have it pre-T...well, it's not going to go away, that's for sure. Thickening of existing body hair is one of the first changes I've noticed.