So here is what I have. The truck is new to me, so I don't know the past on it. The wire for the speed sensor on t-case was ripped off, I fixed that. The selector switch on the side of the trans was bad, so I replaced that. I get no code now. But......when I put it in neutral it does nothing but dead head the rpm's at about 1700, bogs the engine down. When I am in reverse it goes forward in first only. When I hit drive, it dead head again at 1700 rpm. When I out it in 2 it will go though all four forward gears, but shift at a slightly elevated RPM. In first it will do first gear. No over drive flashing light, no codes any more since the other parts were replaced. Sounds to me like a valve body issue, but I am not a trans expert. What do you think. Should I try valve body rework, or just put another good used unit in it? The truck is a 5.4l 4x4 so it should be pretty easy to find one with a lot of these transmissions out there in other trucks.