The slip joint will move very easily, mine would wooble with any movement. If you can grab the drive shaft at the slip -- and push it length wise --if it clicks or twists, that baby is toast. Mine ran about 2 bones, but I had new ends and slip added, (don't beleive it's your xfer case). The Nissan joints are a pain to change, new ones are Dana(?) and far stronger. If you looked at my bio --82 Datsun/Nissan, -- Yea I know Ugle, Old, But -- Paid for cruise control, air, 280Z tranny(gutts), electric buckets, light sun visors, 12 pack cd changer, made my own front suspension lift -- and just added power steering -- after re arranging a dog (sorry). have any other questions email me direct. Hope some were in this mess is some help for you.