The problem is 1st after the truck warms up the transmission will not downshift, it will remain in 3rd gear. It will shift into the lower gears of done manually, then O/D light will start flashing, which represents a diagnostics code.
I pulled up the code #62, which means a faulty #1 solenoid, bad wiring, etc. So, I changed the #1 solenoid, check the wiring, did a resistence test, etc. and I'm still having the problem.
I'm so freaKing frustrated with this truck. The the whole top end of that motor is new. I just got brand new rough country lift kit and starting doing some cosmetic work, looking really good and now this shit!
