Well to start i have waaay to much money in this Blazer and seems like it needs more I started having problems with my 4 wheels drive going in gear the other day..i ended up have to stop put it in park put it in low then put it in high to get it to go in four wheel well they are callin for snow tomorrow so i figured I better check it well i pushed the button(on dash push button 4 wheel drive)and the light for four wheel drive came on then went off and now neither the 4 wheel high or 4 wheel low lights will come on and it won't go into 4 wheel drive high or low,,?in the past the transfer case was replaced/reansmission and the vacuum ac. switch under the battery box where do I go from here?