4000 Final Drive Housings - Stupid Question?

While trying to determine how much gear lube to put back into my 4000 Row Crop SOS, I see there is potentially more than one "final drive housing" each requiring an additional 1.5 quarts of oil. Are they referring to the offset or "drop housing", one located at each rear wheel? I want to be sure I put enough/not too much back in since there is no place to check the level.
 
Yes there is a way to check level. Its a square head pipe plug fill and level. One will be on rear of hsg and other will be on front. Same hsg just swaped sides. The R/A is separate from drop hsgs.
 
I am aware of the ones on the "Drive Housings". If there is one on the differential housing somewhere, I can't find it. The fill point is a larger screw in cap on the top.
 
Ok. Found the plug for the differential under a clump of dirt and grime on the left rear. Good thing I did as it took 11 quarts of the gear lube instead of the 8 the manual said it would. The drive housings took just over 1.75 quarts each. All in all, put nearly 10 gallons of various lubricants in this oldie but goodie. Drove it around for a bit and if it drys up again, I can put it back to work. Thanks everyone for your input.
 

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