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We did check the solenoids with a 12v signal and they work. I think we may only have one speed sensor in the transmission so if we need two that would definitely be a problem. I have to check that out thanks.

Thanks for your questions and suggestions. Yeah we're running the ECU/ECT from the SC400. The a340f is from a 98 t100, and it has 3 solenoids. Not sure if it has the overdrive speed sensor, I'll have to check that out. Does the SC400 brain need an O/D sensor for shifting? I don't have a scan...

I have a 1uzfe from a 92 sc400 in my 4runner and my mechanic friend and I are trying to get it running with a a340f transmission. The 2 shift solenoids are connected correctly to the ecu but the truck never shifts out of 1st gear. If I remove the wiring harness I can manually shift to L, 2, or D...

I can't figure out how to delete this but I am reposting in the drivetrain section. I have a 1uzfe from a 92 sc400 in my 4runner and my mechanic friend and I are trying to get it running with a a340f transmission. The 2 shift solenoids are connected correctly to the ecu but the truck never...