Haven't seen one in aftermarket, but there's likely one out there. The off road pack has one on the front, and the x-fer case, but not on the rear diff.
Yeah, the drain plug sits facing straight down, in the bottom of the case, so protection would be pertinant, but something that's easily removable so you can service the fluid.
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"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."
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