Crazy trasfer case

i was coming home from work and going up a hill and i felt like a mild jurk and the i had no gears.i pulled over and shited my trasnfer case shifter a few times and it finally went back in gear.now when i drive it there seems to be a high pitched whinning nose which seems to be coming from the trasfer case.sometimes it still slips out of gear and when i shift the trasfer gear to 4h i get gears again but there is still a whinning noise.when it goes out of gear a clicking noise comes from the trasfer case.its a 208 tranfer with a 700r4 trans.i have checked and also changed the fluid and it still does it…what the heck?1987 v10 w/ 350