I just bought about two months ago and engine light comes on with 1740 code I had the tcc/od solenoid replaced and two hundred miles later its back I then found the TSB on the valve body boost plate so I took truck back and had that repaired and guess what two hundred miles later its back. from what I have seen and looking at other post I have covered it all can anyone help me please

 

I would have the truck at the transmission shop and see if they can perform a torque converter stall test. If the engine stall, the stall test passed.