Thread: 2nd gear start

I have the same problem with my 4t65e transmission starting out in second gear. I bought the car knowing it had a bad transmission. But no history. I rebuilt the transmission. At first it didn't have first or fourth so I thought it was a shift solenoid. That didn't fix the problem. I then replaced the transmission wiring harness. Now I've got fourth. But still leaving out in second. Won't shift into first even when I shift it manually. No codes so it's not something electronic I'm thinking. Been doing a lot of investigating on the web but no answers for this problem. Like I said, wasn't able to speak to the previous owner to get some kind of insight as to what happened.
What I think is the problem.... the LOW BLOW OFF BALL VALVE might be hanging open. This would only affect first gear. Has anyone else thought this might be a possible fix or has someone done this and corrected the problem.
I'm interested in hearing some feed back.