It just comes from the fluid you put into the differential. There is no seal on that side so it splashes/flows out of the differential into the axle tube and lubricates the CAD parts.
90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs
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