So I have had a light "pop" when I make sharp turns with my K30 and the other day I needed to pull on one of my trucks with it and was the first time I had it in 4wd since I bought it. I started to pull on the truck, tires started to chirp, the front end wen't "pop" "pop", then made a quick ratchet sound, and shut up. After it quit I think it then slipped fully into 4wd. I later drove around the yard making figure 8's in 4wd, everything seemed fine. Whats up with that? Do Spicers need servicing and "repacked" with grease every now and then? I would imagine it' been a while since the truck was in 4wd. And yes, I had the hub completely engaged (turned as far as it would go to lock). Since then , my binding "pop" went away when I make sharp turns. Can a lockout hub "jam" half in and out?