I have an 84 k5 with a 350eng, 350 trans, and an np 203 tcase, and it jumps out of 4wd when on dry land. I was driving it down the road tonite in the snow and whenever I hit a dry spot or a spot with no snow it jumped out of 4wd. It does it in 4 hi and 4 lo. Any ideas or suggestions would be greatly appriciated. I am fairly new to the 4wd game but am learning quickly, so any help would be great. Thanks.