Question about 1999 Chevrolet Silverado 1500

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Leaks oil can't find source

The transfer case was making l lot of noise. There was no oil in it. I filled it and the noise stopped but it has a slow leak. The oil is not leaking form the gasket or the prop shaft seal. The oil appears on the rear passanger side of the transfer case but I can't tell where it's comming from.

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