I bought our 1989 Ram 50 Power Ram for my sons 16th Bday.. The person I bought it from told me he changed out the auto locking hubs with Manual Hubs. I am not sure what he did but at around 35 miles an hour the wheel lock light comes on and there is a terrible vibration coming from the front passenger side.. It stops when the wheel lock goes off. This happens when the hubs are in the free position and when the transfer case is in the 2wd position.. HELP PLEASE..