My Blazer is not engaging in drive or reverse. When I try to put it in 4 low or 4 high it doesn't do anything either. It feels like it's in NEUTRAL 😐 I don't know WTF is wrong with this thing. It's taken me to the depths and back so I really don't want to just give up on it and I don't want to take it to the local mechanic without knowing exactly what's we with it. PLEASE HELP! All the lights on the 4wheel drive light display turn red when trying to put in 4wheel drive also