I have a 95 Tahoe with floor shifting 4wd which does not seem to be working. It started snowing pretty good on Monday morning. I put the Tahoe into 4wd HI and seemed to work just fine. Later that night I noticed that the 4wd indicator light was flickering. The next day the light would not turn on and I could not feel anything engaging. The temps got to be -5 (-15 with windchill). Thanks for the help.