Hey Allen,The double reduction rear end(2 speed) takes between 11 to 14 1/2 plus pints of 80-90(mill spec is 2105-c)gear oil initially.The front plug is for filling the system so as to bring gear oil to the two front pinion bearings right away if the system were dry as in new or just overhauled.The gear oil will drain back toward the rear cover if overfilled.For normal service,the oil is checked at the rear plug as any(most)rears would be.I blew my high range and had to overhaul it last year.What a big boy with 6:13(high range)and 8:10(low range)ratios.Hope this helps!
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