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If you want to do a little work you can drill the lower flat portion where the drain plug USED TO BE and tap it with 3/8" high pressure pipe plug thread and install your own drain. I have done this on several vehicles and is not that big a deal. My buddy put plugs all over his Jeep drive train.

Note: when you start to tap go in a little and try the plug as you go. You want it to snug up when the top of the high pressure plug is even with the housing. Won't hurt to wrap it in teflon pipe tape when you run it in.

I am thinking about doing this and replacing with synthetic gear oil and forget it for 250K on the Ho I just picked up. Synthetic grease will hold up much longer than conventional grease.
 
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