Hello and thank you for using Just Answer
when you say it won't go into gear is the shifter stuck in PARK?
or does the shifter go to drive but nothing happens?
Do you get anything in reverse? or any of the gears?
have you checked the fluid level?
this is an automatic?
try shifting the transfer case into 4 low and see if it moves
let me know what happens
also please verify if reverse is working?
Unplug the transmission electrical connector to see if it will go into any gear.
if it still does not go into gear there is internal damage and the transmission will need to be rebuilt
it's a 6 wire connector and should be on the left side of the transmission
I do not have pictures just a wiring diagram
should have the following wire colors
if the one you ones you found have these wire colors disconnect them
there are electrical solenoids in the transmission but normally reverse would still work if it was an electrical issue
because you have no drive or reverse it is going to be a mechanical internal transmission problem