Devs93
OBS 4 EVA
first of all i love your profile picture ive had it saved on my phone for years, and as far as your truck goes, judging off the fact that it sits for so long then it could be just a passage blockage but there isnt anyway to tell for sure just by reading that post, for an example, it could be as simple as just the shift solenoids not communicating with eachother for some reason, but the good news is that it defidently doesnt sound like a hard part problem which means that most likely youll be able to fix it from the pan, worst case is taking off the valve body, but check what the computer is saying first and we can go from there
I hadnt noticed on my original post that i had lost the speedo changed the vss still nothing so I guess aIm gonna Be going through the harness