so i picked up my rebuilt trans mission installed. filled it up and then the over drive light started to flash. pulled the codes off p0755 and p0758 witch are circuit malfunction codes ive checked all my wires going to the trans but have not pulled the pan the trans was rebuilt to heavy duty specs ive check every thing but the solenoids i m towing it up to the rebuilt shop tmr i think they pinched a wire installing the new valve body any other suggestions i have reverse and can put it in first but drive and second do not move o and 2003 xlt 4.6l 196,000 miles i also installed headers but tat shouldn't threw a code for the trans

 

Did you check each shift solenoid wire for continuity, short to power, and short to ground? If not you didn't check the wiring.

In a 2003 transmission there shouldn't be any wires inside to get pinched. There is a snap in hard plastic part that contains the wiring. It can't get pinched in the valve body. It might not be plugged in, but it isn't pinched.