I have an 87 jeep wrangler that i bought about 6 months ago. When i first bought it, it would clunk a little while in 4 wheel drive. I got stuck in the snow and ice the other day and tried to put it into 4 wheel drive and it goes in as smooth as ever but the front wheels don't spin. As i was stuck i had to get the jeep out so i left it in 4 low and backed out of the ditch i was in. Now there is a clunking sound every time that i drive over 5 mph and it sounds like it's coming from the area of the transfer case. I'm not sure what's going on and any input would be greatly appreciated.