OK, how much oil and trans fluid are you losing ?
meaning are you using a quart every week etc for oil and trans ?
for beginners, to isolate the head gasket problem, go to any auto store or walmart. pick up a bottle each.
I've tested all the products and this company did the trick to stop the leaks.
http://www.barsproducts.com/T20L.htm
http://www.barsproducts.com/E10L.htm
use it for a week and then post your updates. Good luck and I hope this will do it. worse case is going to be what your'e already looking to do . which is repairing. but this might prevent costly repairs. worth a shot.