First off, I better say that maybe this isn't a stock driveshaft. I'm not the person who bought the truck. I have a front driveshaft that came off a 1991 3+3 one ton. (4L80E/205) It only has about an inch of travel, which seems much shorter than what others say their stock ones are, roughly 3". This driveshaft does not have a threaded portion for the seal. My understanding is that typically, you unthread the little cap at the slip yoke section, and the driveshaft will come apart. On this one, there is no seal, or threaded portion. There is a boot on it that apparently tries to seal it from dirt (appears factory, based on the type of clamps used) but when I pulled the boot loose, there was nothing there to unthread. Kind of curious if you can take this type of shaft apart, or if you have to cut it? I can compress the shaft far enough to see the splines stick out the opposite end 1/8-1/4", and there is no c-clip or anything on it, so I'm not sure what keeps it from coming in half. Anyone else dealt with one of these? Answer in post below.