since you have to pull the tranny out anyway to swap them, why not just take a stab at rebuilding your own yourself?....that is if you were going to do the swap yourself.
i did a swap once putting a 2000 with 106k into the one with 180k. the 106 lasted only a few months and that was from a car where the history was known.
point is, you're not going to know what you are getting--even if you know the car's history (which you won't from pick in pull). these things pretty much are guaranteed to break. its kind of a hassle finding the right transmission for the right years, etc. and once you do all the work putting it in (which from the top with a cherry picker is not terribly difficult) you are basically just a) hoping you got one with a good rebuild already or b) just hoping for as much time as you can get before the replacement.
but rebuilding it yourself.....that is something i want to try if there is a next time. you get to learn a bunch of stuff doing it yourself.
