I have absolutely no idea to your specific question. All I can say is that if you decide to do it yourself both of those units are super-easy to rebuild. I just ordered a master overhaul kit for my 465 from Novak and after shipping was only $210. Thats gaskets and everything.
The last time I had a sm465 apart to change over the mainshaft I was too far away from a shop press so I took the mainshaft up to the local transmission shop and they wanted like $90 to press off a gear and a couple of bushings and press the new ones on. Pfffft. I would hate to know what they would have wanted to rebuild the whole thing.
It seems around here anyways that the "transmission" shops just want to swap out autos. They don't seem to fool with rebuilding manuals very much/at all.
Anyways I know thats of no help at all, and your question is not "do you guys think I should build my own tranny and t-case?", but I wouldnt shy away from it at all if you find that its too expensive for you to take it to the shop.
Good luck