I'm working on wiring my 3.4 swapped 92' 4runner. I am very confused how the engine wire harness connects to the transmission. Can I leave the 3.0 harness on the transmission and somehow wire that into the 5vz ecu? If someone could point me in the right direction that would be great. If someone has a conversion harness , how does that hook into the transmission?

 

I can't help you but I can suggest going to the 3.4 swap section. You may get more replies there. Good luck with it.