I'm currently in the above mentioned truck. DD13 motor and DT 12 Auto. What is normal temp for rear axle temps?
I noticed my front got above 200 a few times pulling small hills in SC in 70 to 80 degree weather. Front also stays around 180 to 185 pulling I-80 heavy across PA, even in 40 degree weather. Rear always stays about 25 to 30 degrees cooler than the front.