Yep on both of the aboves.

Just because the wheels are not turning isn't all of it. By eyeballing the front driveshaft directly like mentioned it will determine for sure its the transfer case. Just using the wheels as a test spot leaving other things out of the equation like a broke cv joint, stripped differential, etc.

By eyeballing the front driveshaft and knowing its not turning when the rear wheels are turning lets you KNOW its the transfer case and not something else.

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