'86 jimmy transfer case issues?

Merry Christmas all.
So I'm delivering flowers in my '86 Jimmy because it has 4wd and there is ice all over the place. Ive been doing real well untill today, when I
lose all forward gears in 2 hi and 4 hi and low. all i get is a sick grinding sound. What the heck is wrong with my truck? any sugestions ?
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