Hello to all. A brief history about the truck: I purchased the truck, non-running, it has 220K miles, 4.0L engine, 5R55E trans, 4X4 XLT. When I purchased it, the vehicle was choking on its own exhaust from a bad catalytic converter. I replaced it, and the engine runs well now. After a road test, my transmission is not shifting into O/D. When I push the O/D switch on the shifter, it does nothing. After about 5 min of driving, the trans MIL starts blinking. After that, the shifts through all the gears start to go haywire.... I have already pulled the pan and replaced the valve body assembly with a new one along with all new solenoids. Another issue I have that I haven't been able to track down yet is the number 6 fuse will blow randomly like there is a short, I put my ohm meter on the load terminal, and then the other lead on a body ground.....I didn't get anything out of the ordinary to track down a short, so it must be intermediate. I don't think this issue would cause the problem with the transmission, especially since it works most the time without blowing.

The only codes I'm still getting for the truck are P0734, P0733, P0731, which are still related to the solenoids. I'm at a loss as to what it might be, I've thought maybe the wiring harness inside the transmission? Or the PCM has a problem?

Anyone here able to offer any advice?