I have normal cortisol, progesterone, and estradiol but high testosterone and very high dheas (double normal range). i am also a type 1 diabetic and seem to be insulin resistant (hba1c is 8.2). could insulin resistance be the cause of elevated dheas?

Yes...but: This day in age we are seeing some people with type 1 diabetes and features of insulin resistance, polycystic ovarian syndrome, metabolic syndrome and type 2 diabetes features. This sounds like PCOS, believed to usually be caused by insulin resistance. I am also concerned over a high prolactin, thyroid disease, or congenital adrenal hyperplasia and these should be completely checked too.