I just took appart my rear drive shaft because the splined-slip-part was so bound up it wouldn't move. Is it normal for the splines to be coated with plastic? I've never seen this on factory shafts. The plastic (maybe nylon) is starting to split and come off, which is why I think it is binding. I'm affraid if I remove it all the shaft will be too sloppy though. Has anyone else run into this? The shaft is from Arizona Drive Lines and is about 3 years old. This is the third time I've taken it appart to clean/regrease the slines, but the first time I noticed the plastic coating splitting.