Well, If you want a modern, Mopar overdrive automatic, you're gonna have to step on it somewhere. They aren't a 904 or 727. They are complex overdrive units and they aren't cheap. Look at a quality kit. They aren't cheap. Then, you're gonna want "some" kind of upgrades, shift, maybe more clutches, maybe a bolt in sprag......Geez Paul, you can't do this stuff for free. Even as cheaply as I build my stuff, which is real dirt road stuff, at some point, I do have to spend a little on something. In my case of course, it won't be on an overdrive transmission, but there are other things I do have to step up on. Do you think a $3,000 transmission will just fall out of the sky? That's about what they cost now to be pulled and put back in.....and that's Georgia prices, you're in Canada. Maybe you should simply run a 727? They're cheap, easy top build and very reliable. You don't have to figure out how to make them shift with switches and solenoids and computers. My guess is you might could find someone up there that would GIVE you a core. Plus, at the end of the day, it's a bolt in swap.