So I looked for a thread on this and could not find one. Recently bought a 98 gtp and the trans was slipping, so I bought a donor tranny out of the same year regal (supercharged as well) to rebuild. Just got the rebuilt tranny in yesterday. I had all new interior electrical components put in with the rebuild. I drove it about 50 miles and it was shifting good, but while I was driving the trans went into limp mode (3rd gear only). I checked the codes and got p0748, p0753, p0758, p1860. These are just about all electrical codes that would be on if the trans was not plugged in. I checked all connections and grounds and they all checked out. I also tried driving it unplugged and there was no change, leading me to believe this is an electrical issue. I checked the TCC fuse under the hood and that checked out as well. Anything that I am missing? Does anyone know if these wiring harnesses are compatible with each other, or do I need to put the stock wiring harness into the rebuilt tranny?
Thanks in advance for any answers!
