So a little background. 4wd actuator got stuck in 4wlo. Drained a bunch of water out of it and got it back into 2whi. The gears fell out of the actuator on a dumb#$$ move by me. 4runner has 280k miles so I figured I'd just swap the t-case with a used one. I have a full transmission available with a t-case that has 170k miles on it for $500. My question that I have is, should I go ahead and swap the whole transmission due to lower mileage or just the t-case. Keep the used transmission around in case mine fails? I just did a fluid change on the transmission and have zero issues with it. Any thoughts appreciated.