If he wants to swap in the new (used) ECU will he have to swap wiring harnesses as well? If so that would be pretty drastic.

I'm pretty sure it's fairly easy to run a manual tranny in a 4runner wired for an automatic. I've been studying the issue because I have a wiring harness and ECU from an auto tranny 4runner that I want to install in my carbureted, manual trans '84 to upgrade it to EFI.

A lot of people on the Marlin Crawler board have done the tranny swap and they say it's a 'piece of cake'. Here's a Marlin thread on that topic -- Matt Tranny Swap Thread

Last edited by matts; 06/04/06 06:23 AM.