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noticed this today when i was under the truck removing one of my steps.
i did gear something the other day that went up into the wheel well when i was going down the road. notice the marks on my exhaust.
does this look like it's supposed to?
notice the zip ties?
If it's made the way i think it is, as a tube, then it must have gotten torn then thrown off, no other way. To replace it i imagine you'll have to disconnect one end of the shaft and slide it on. It's there to keep crap out of the splines of the joint; personally i'd just duct tape a plastic bag around it and see how long it lasts, but since yours has a carrier bearing to contend with that might not be an option.
Adding the zerk seriously increases your chances of over-greasing the splines, causing the splines not to slip together properly, and causing the driveshaft to bind.
I thought about doing this, but after thinking it through, decided against it. Just take the time to do it once-in-a-while.
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