Ok I posted a while back about my bravada jumping out of overdrive. Now I was driving a bit over 30mph and it literally downshifted out of third into second gear on me. Wouldn't shift back even after I came to a dead stop. Got home and turned the vehicle off and then back on and it was shifting normally again. No check engine lights. No nothing. I am at my wits end. I've literally replaced every electronic component in the tranny up to and including the wiring harness. I've replaced the tps, maf, map, alternator, park neutral switch, brake switch on the brake pedal, ignition switch harness in the steering column, changed the fluid and filter, changed the transfer case fluid, and also had two other reputable repair shops and also the dealership look at my vehicle and they all said my tranny and torque converter are perfectly fine. I don't know what else to do here. Anyone got any ideas or have experienced the same issue? Can the wheel speed sensor cause this cause I'm replacing those next since they are bad. Any help is greatly appreciated!!!

Is it still bad? If not, drive it.

Before it only jumped out of overdrive after driving at highway speeds for 20 to 30 min. Now it'* downshifting from third to second gear when I'm only driving a lil over 30mph. It'* frustrating as hell and I need to figure out what the actual problem is so I can get it fixed. I just can't keep throwing parts at it cause it doesn't seem to be working.

It'* a good vehicle with a good engine. I just need to get this problem sorted out and done with.

Ummm . . .

"since they are bad" tells me that you already know they are bad. Yes, change speed-sensing devices so that they are removed from the equation. At the same time, the vehicle speed sensor would be what this car uses for shift calculations.

what transmission do you have?
4T65E?

All speed sensors except for the abs wheel speed sensor have been changed already.

Transmission is a 4L60E

"All speed sensors except for the abs speed sensor" includes the VSS and that'* about it. What other sensors are you referring to?

There were two that I found. One on the tranny and the other on the transfer case if I remember correctly. My brother put them in for me. I found it strange but both were replaced.