My first post, I bought this truck and it was having shifting problems, I had to let off the gas for it to shift into 3rd. The o2 sensors were had so I changed all 3, then the problem still occurred. I changed the speed sensor and shift solenoid b thinking it would fix my problems since that code was thrown. I also am having issues with going into drive, the truck has to be put into 2 then shift into drive, when put into park from drive it revs to about 2.5k then dips under idle like it tries to die. Full service was done once I got it. I don't know why these are occurring.