How cool for your Dad to have done this for you (and what an adventure for him, I'm sure).

Out there in Arizona I bet you have a lot of Pick-A-Part yards you could check by going online and doing a search for your area. Keep an eye out for private parties selling their truck and consider getting the whole truck for parts (you learn a lot from doing that). Having a transmission shipped to you is going to be pricey, so search locally and see what you come up with. Best of luck to you, too, because that looks like a sweet little Arrow. It certainly says a lot for your Dad to have towed it across all those miles for you.