I know this sounds like a dumb question, but after i disengage 4x4 and goto 2wd my truck does a quick hop every few feet. Then in drive it makes this chain sound. I have to put it to 4x4, then go back to 2wd to get it to stop making that sound. Someone one tell me how EXACTLY to engage/disengage properly. Its an '88 auto so it has the np208. Keep the shiny side up, and the greasy side down.