My cousin rebuilt his 700R4 by a video and manual, everything works perfectly except he now has NO Overdrive. What did he do wrong??? TCi master rebuild kit and video, they suggested modifying one valve in the valve body, the one that some don't even have..?
Any ideas where to look for problems???

 

Did you hook up the wiring harness? TCI sells a lockup kit that doesn't require an ECM...

I have one if you need it, I decided to go with a TH350