1710 Hydraulic Fluid - No fluid at the final drive

I recently purchased a used 1710 and decided to change all of the fluids. I drained the main trans reservoir which is also supposed to feed the center diff and rear final drive. The rear actually has two drain plugs. After filling the main reservoir back up, I pulled both of these plugs to confirm the fluid was shared w/ the main trans reservoir. There is none getting to the rear end and I don't see anywhere else to fill it. Any suggestions?

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