I live down a dirt road and accasionaly need 4 wheel drive in my truck. However, my NP 203 T-case will not go into four wheel drive. I have not used four wheel drive since last year and have drove it everyday since it last use. Before i got the truck the previous owner had installed a conversions kit for 2lo and 2hi and manual locking hubs. The problem is the shifter will go into 4hi and 4lo but it will not engage the transfer case.