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How are the tires?
How is the fluid level in front and rear differentials?
I have seen people service the front diffs and forget to fill it and it will bind when turning.
Do you have any codes?
I am going to let another expert help out on this.
Is it an automatic?
There is a slot in the under hood fuse box for you to put a fuse in. This turns off the rear solenoid when you install a fuse. This will at least confirm the issue is the transfer clutches. You would need to test the pressure at the solenoid to confirm it being the clutch discs or the solenoid.
Agree with the dealer, the clutch discs are a more common issue then the solenoids, however sometimes a transmission fluid flush will free up the solenoid if it's the problem.
You can inspect, I don't have the spec for them, but since you have it apart, I would order a clutch kit and toss them in there. Remember to put some atf on them when you get them in and seated.