I need to know if a 99 year Pressure control solenoid will physically fit into a 03 4T65E transmission.

I think I figured out my transmission'* problems. I'm using a 99 PCM and an 03 4T65E and people suspect that the reason my transmission doesn't shift properly is because the 99 PCM can't communicate properly with the 03 PCS. I have heard that they are electrically different. It will slip into gear unless I raise PCS pressure, but the shifting is erratic at times and the car goes into limp mode within 15 minutes of driving with no other explanation.

So, will that PCS physically fit into the transmission?

I don't believe I've looked at an 03. I'd probably call Dave at TEP for that answer. He'd know off the top of his head.