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its original the oil looks without water if oil goes out thought water can come in. not sure if seal kit has ever been installedNeed more information to help you.----Is it original with one piece driveshaft ?----Any water in it that might have frozen.----Ever had a seal kit installed ?----Pressure tested the gearcase?-------Here I would take it apart and look at condition of driveshaft seals.----Shift rod o-ring.----And if suspect I would install a seal kit.----Little over $100 and way cheaper than gears , bearings and shafts.