if the boot is leaking on a new axle, take it out and get another one, aka warranty it.
the hub has no grease to leak out, its a sealed bearing.
unless its not grease your seeing, but oil leaking from the oil pressure sensor, its right above the pass side axle and just past the oil filter, if you turn the wheels to the left and stick your head from behind the tire you can see it. a flash light helps in the day time sometimes. if the plug is wet with oil its leaking, they start out dripping a little and get as bad as pouring warm syrup out a plastic bottle.
if this is leaking change it asap. i lost 3 quarts of oil in no time when mine blew out.
PS ive blown 3 of them so far, now i have a brass plug sealing the hole up, sick of replacing it. they only run 12 bucks, but they all fail it seems sooner or later.
