2007 Dodge Ram 2500 4wd Mega Cab 5.9 Cummins, 4 speed auto. Differential is identified on build sheet as : 11.50 Rear Axle, Anti-Spin Differential Rear Axle, 3.73 Rear Axle Ratio.
Responding to rear end noise (probably partially due to tire noise, end of life), dealership pulled drain plug and...