first I have the transfer case that only has part time 4 wheel drive...

It started out my part time 4 wd ligt didn't light up but the 4wd worked.. then it stoped working.. I noticed the two vacum lines disconected ... so I conected them... it still didn't work for a while.. then I felt a pop.. like it was engauging and the light came on... so I thought all was good... this was 3 weeks ago...

Now last night we got what they say was 10 inches of snow but I think was more like 15 and was driving to the shop to go plow and felt a poping from the front end.. it felt like I was hiting a bump... but happened intermintly.. when I but it 2 wd it doesn't do it...

This all has happend in 4 hi.. don't ever use 4 low but in sand to move the boat.

Any help would be helpful.. need to get this fixed so I can know I can get to work