If your Toyota 4×4 is leaking fluid from the rear flange/driveshaft on the back of the transfer case, here is most likely the problem and how I fixed it for $10. This DIY How-to video shows the symptoms and steps to replace the leaking rear flange oil seal on my 1985 4wd Xtra Cab.
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Sweet truck! Just subbed, need to replace same seal in mine.