I've got a 2001 F250 4x4 7.3 280k. Transmission shifts hard under hard acceleration. I have replaced the solenoid valves in the trans. Didn't fix problem. OD light flashes still. Same code. I think I need to make sure there is 4 ohms to the hot side of valve. Do you know of a good wiring diagram for trans or know this problem? Thanks. Mark