47re limp
 

Working on a 99 that is going into limp mode. When truck is first started it shifts 1-2-3 n no overdrive and will not down shift out of 3rd. I have checked all grounds. Thinking the problem is in the 8 pin plug but no luck on finding a good wiring diagram. I am picking up a ground on 3 of the 8 pins. pin 3 4 5. Thank in advance for any help.