Help Go shift 4l65e won't shift
 

Been fighting this for 4 days now. Connections are hooked up right. 4l60e is selected etc. It will not shift out of first gear. I bypassed the go shift and got it to shift to second gear manually but I can't get 3rd or 4th

Had SIMILAR issue with my terminator, turned out I had the transmission connector on the passenger side in 180 out,, YES it will fit that way not perfect ,, but it fits, no it doesn't work very well.. :D

Drove me crazy for a week.. There are tiny arrows on the connector that should point at each other..
It seats deeper and locks better when correct.

Worth a look..