Ya Ya YA, Barry, Long day today, I got to work on A 2004 2500 4x4 today,beautiful truck 5.9 diesel, took out the 4.10 gears and installed 3.73's, front and back.Gotta tell you something guys, impressed with the AAM differentials, very tough looking ,and heavy.11 1/2 in the rear and 9 1/4 in the front.