Hi I'm new to this forum and new to this truck. I have a 1999 with the 246 t case. I recently bought this truck for my 17 year old son and the 4 wheel drive will not engage. When I push the four wheel low or high button I can hear the actuator working and the light stays on but the front drive shaft is not turning. I jacked up the back of the truck to see if the front would engage and pull the truck but I got no movement of the drive shaft at all. I did hear and feel a clunking noise that seems to be coming from the transfer case. Is there Anything else that I should check before I buy and put in a new t case?