I have a problem with my transmission not shifting. Originally I had a code 28 and a hard shift between 1st and 2nd. Transmission shop said 28 was Trans oil pressure switch. I replaced the switch. I also replaced the A and B solenoids, the 3/2 down shift solenoid and the wiring harness. Now it doesn't want to shift. It won't shift down when you accel hard. You can only feel it shift once in a while. Shifting manually doesn't work. I've pulled the pan and see nothing obvious. What in the world have I messed up? Thanks for any help. I have a headache from beating my head against the wall!

 

Well, it was a dumb problem. Got to remember that when your lying on your back looking up things can be backwards. Had the solenoid in the PWM slot instead of the 3/2 downshift slot. Works fine now.