i just cant figure it out bought the truck with no over dive tested the tps and that checks out good changed filter and fluid still nothing and also changed break light switch still nothing now im thing some thing liek o/d solenoid or o/d override switch but i think the switch is good or what about the cable that goes from the pump to the tranny i really need help with this. need this truck so i can start the resto on my 91 first gen

 

Could also be the tranny temp sensor or it's wiring.