Let me say that I knew nothing about transfer cases til I bought this truck. 76'K5 400sb / 350 / np203. When I bought it I'm about a 90% sure the po said that it had a part time kit installed and it does have Warn locking hubs. At the time I didn't know what he was talking about. Anyway, went offroading and climbed some hills a couple of weeks ago and 4 High worked great, but for some reason my front wheels weren't powered when I had it in 4Low. Is that possible, and if so what might be the cause?