Sorry man but good luck figuring out what the problem is I have countless hours working on my friends. Ended up replacing the whole transfer case and new hubs. Terrible 4wd IMO. Great Stock rear locker if it's not to worn out I believe it's the Q90 or something like that. Locks really hard as soon as they start to spin
I had a probe like that. It was just a NA 4banger, but you could find the turbo motors cheap for them. Easy to make fast too.
What all did you have done to it? Mines pretty simple so far i only have a 2.5 catback exhaust, custom cold air intake, polly mounts, and a short throw shifter in mine right now. I want to lower it but funds arnt allowing right now.